2000 tane Elektronik devre şemaları

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Evet arkadaşlar kategorilere ayrılmış tam 2000 tane elektronik şema var bu sitede

ISET Electronique digitale J.LEPOT


Alarms and security related schematics
# Proximity alarm
# Electronic lock
# Electronic door codelock (PIC16F84)
# Moisture alarm
# Fridge door alarm
# Ultrasonic remote control & alarm system
# Wire loop alarm
# Digital entry lock
# Proximity switch
# Toxic Gas Detector
# Door knob alarm (PDF)
# Water seepage alarm (PDF)
# Micro-power over temperature alarm (PDF)
# Personal silent alarm system
# Active IR motion detector
# A Basic RF Transmitter for PIR Sensors
# PIR motion detector
# Simple alarm system
# Automatic door opener using PIC12C508
# Home security project
# 5 Zone alarm circuit
# Miniature loop alarm
# Novel Buzzer
# Gate alarm circuit
# Modular Burglar Alarm
# Motorcycle alarm
# Enhanced 5 Digit Alarm Keypad
# Enhanced 4 Digit Alarm Keypad
# RF Alarm
# Single Zone Alarm
# Water Activated Alarm
# Water level alarm
# Perimeter monitor
# Digital combination lock
# Alarm control keypad
# Almost Ultrasonic Motion Sensor
# Touch activated alarm system
# Combination Lock (PIC16F84)
# Low power RFID transponder
Audio power amplifier schematics
# Two transistor audio amplifier
# Personal stereo audio amp
# Headphone amplifier
# 1.5W Audio amplifier
# Low-level audio amp
# 10W amplifier
# 80W amplifier
# LM383 12V Amplifier
# 100W Amplifier
# 18W Audio amplifier
# 25W MOSFET amplifier
# Headphone amplifier
# Portable headphone amplifier
# 2W amplifier
# 4W amplifier
# 8 watt audio amp
# 20W Amplifier
# 50W Amplifier
# 100W Audio amplifier
# 100W RMS Amplifier
# 2-Channel Power Amplifier
# Push-Pull Class A Amp using type 5687 dual triodes
# Push-Pull Class A 2A3 Stereo Amp
# Single Ended Class A2 SV811-10 Stereo Amp
# Audio amplifier output relay delay
# Spatial Distortion Reduction Headphone Amp
# HeadBanger Headphone Amp
# 2W Amplifier
# TDA2030 8 Watt amplifier
# Headphone distribution amp
# Headphone monitor amp
# 50W audio power amplifier
# Bi-Directional 2.4 GHz One Watt Amplifier
# Bi-Directional 900Mhz One Watt Amplifier
# 20 Watt GaAaFET Power on 2.3 GHz
# 1 Watt 2.3 GHz RF Amplifier Using a MRF2001
# 2.3 GHz Power Amplifiers
# 2304 and 3456 MHz Power Amplifiers
# High quality exponential VCA
# 16 Watt amplifier
# 8 Watt amplifier
# Power amp schematic (PDF)
# 20 Watt Class-A Power Amplifier
# El-Cheapo - A Really Simple Power Amplifier
# Single Chip 50 Watt / 8 Ohm Power Amplifier
# Hi-Fi Headphone Amplifier
# 100W Guitar Amplifier
# Death of Zen (DoZ) - A New Class-A Power Amp
# Soft-Start Circuit For Power Amps
# Thermo-Fan To Keep Your Amp Cool
# Audio Amp Output Power Limiter
# 55W (Originally 75W) Power Amplifier
# 300W Subwoofer Power Amplifier
# 20 Watt / Channel Stereo Power Amplifier
# Mini bench amplifier (LM386)
# 12 Watt Valve Guitar Amp
Audio preamp circuits
# Microphone amplifier
# RIAA phono amplifier
# Low impedance microphone amplifier
# Dynamic microphone preamplifier
# Phono preamp
# Masthead preamp
# Preamplifier for microphone or guitar use
# Simple microphone preamplifier
# Tube microphone preamp
# Simple Stereo Electret Microphone Preamplifier
# Simple Stereo Electret Microphone Preamplifier
# Phono Preamp
# Simple microphone preamplifier
# ECM Mic preamp
# Hi Fi preamp
# Balanced microphone preamp
# Audio preamp
# Electret mic amplifier
# Audio preamplifier
# Vacuum Tube Microphone Preamp
# FET Preamp Cable
# Audio preamp
Automative, car and motorcycle schematics
# Electronic auto stethoscope
# Turn signal alarm
# Motorcycle turn-signal system
# Cigarette lighter 9V adaptor
# Analog Tachometer for Gasoline Engines
# Headlight On reminder with Light
# Adaptive Windscreen Wiper Control
# Car clock
# Car message display
# Car interval wiper
# Safety indicator light
# Speed limit alert
# Grand Cherokee Off-Highway Lights
# Engine control unit schematics
# Portable CD Player Adapter For Car
# Car battery charger
# Wireless Auto Tachometer
# Alternator Signal Detector
# Automotive alarm system
# Road ice alarm
# Automotive Anti-Lock Brake Control Driver
# Headlight reminder
# Breath Alcohol Tester controlling a car ignition system
# Simple car battery charger
# Parking sonar
# Fuel injector pulse width monitor
# BMW R Series Motorcycle Regulator Schematic
# 80188XL Engine Tachometer
# Integrate Fuel Pump Wire Security Cut Off with a Turbo Timer
# Simple Car Preamplifier and Artificial Earth
# FCD (Fuel Cut Defencer)
# Interface between GM's 5 Volt 8192 baud ALDL data stream and a PC serial port
# 5301 wideband fuel mixture display
# Wide Band Fuel Mixture Display
# 3rd brake light
# 12V to 9V car coverter
# Car Nicad charger
# Combination lock for car liftgate
# BMW motorcycle side stand protection mod
Data acquisition and data logging schematics
# Air flow detector
# Air flow detector
# Strain gauge sensor
# Digital Water Wave/Tide/Level Meter (PIC16F876)
# Self made data-logger V2.5 (second edition)
# Magnetometer
# Analog input section based on AD9220
# uModem 4+4/8 channel A/D board
# ADXL202 accelerometer to CV output
# Light direction sensor
# 12-Bit ADC interface
# Digital thermometer
# Universal flight controllers / datalogger
# Rain detector
# Home Brew Compass Sensor
# Using 555 Timer as an A/D converter
# ADC0804LCN 8-bit A/D converter
# Web-based thermometer project
# Low Flow-Rate Thermal Flowmeter
# Geiger counter
# Differential Capacitance Measurement for Tilt Meter
# Honey Bee counter (PDF)
# Capacitance type liquid level measurement (PDF)
# Thermostat node schematic
# Digital PC Oscilloscope
# Ultrasonic Range & Imager
# Precision Digital Altimeter
# Digital compass schematic
# Temperature datalogger
# Serial Port A/D-converter
# Centronics port D/A converters and low-pass filter
# LCD Thermometer
# Acceleration monitor using Analog Devices ADXL202
# Optical sensor using PIC12C508
# Wireless Liquid Level Sensing for Restaurant Applications
# Accelerometer Schematic
# Pressure Sensor-Based Altimeter Circuit
# Ultrasonic range finder circuit
# 1-wire barometer
# Water-level sensor
# Addressable ADC
# Electronic altimeter using PIC16F877
# Wireless weater station
Filter schematics
# Galaxy Noise Filter
# Low-pass active filter
# Filter Circuit for the Earthworm Seismic Data Acquisition System
# Active 2nd Order Filters
# RC Notch Filter (Twin T)
# Multiple Feedback Bandpass Filter
# CW filters
# Self-tune filter
# SSB AF filter
# Helical Resonator Notch Filter
# 3KHz low-pass filter plus audio amp (PDF)
# Active bandpass filters
# Bandpass filters
# Butterworth filters
# Narrow band audio bandpass filter
# Inversal notch and bandpass filter
# DC Accurate, Active RC Lowpass Filter
# Chebyshev Bandpass Filter
# Bandpass filters
# Chebyshev / Butterworth filters
# Biquad Active Bandpass Filter Schematic
# "A" Weighting Filter For Audio Measurements
# Multiple Feedback Bandpass Filter
# Digital signal processor (DSP) for radio communications
# 29.85 MHZ bandpass filter schematic
# 29.85 MHZ notch filter schematic
# LC filter design
Games and fun stuff (schematics)
# Visor cradle serial interface
# Electronic coin tosser
# Electronic craps game
# First response monitor
# VCR ping pong game
# Video ping pong game
# MBC5/CPLD for the GameBoy
# GameBoy Camera Parallel Port Interface
# Mobile robot (PDF)
# PSX controler to PC MIDI converter
# Dreamcast PC serial adapter
# GameBoy Cart Programmer
# Memory game
# 32 Kb x 8 emulator for the GameBoy
# Project: NES to Atari 2600 controller interface
# Battery Meter for Pinball Machines
# SRX1 (Stephane's Robotic eXperiment 1)
# Pine Racecar Victory Judge
# Interfacing Sony control stick to Empeg
# Electronic Nicad glow plug driver
# April Fools LEDs
# Pinewood Derby logic
# Quiz Master
# GameBoy Schematic
# GameBoy LCD schematic
# GameBoy Power & Cartridge schematic
# GameBoy ROM+RAM+MBC1 Cart Schematic
# GameBoy MBC1 circuit equivalent
# Super GameBoy schematic
# Quiz show indicator
# Dreamcast interface
# Bingo!!! (on your tv)
# Slot car TV cronograph
# Furby reverse-engineered circuit
# Sanyo 20EZ monitor Arcade Game (300k ZIP)
# Burger Time Arcade Game (500k ZIP)
# Dig Dug Arcade Game (800k ZIP)
# Frogger Arcade Game (500k ZIP)
# Galaga Arcade Game (542k ZIP)
# Gyrus Arcade Game (800k ZIP)
# Junior Pacman Arcade Game (400k)
# Ladybug Arcade Game (335k ZIP)
# Mappy Arcade Game (470k ZIP)
# Moon Cresta Arcade Game (300k ZIP)
# Mr.Do Arcade Game (554k ZIP)
# PacLand Arcade Game (316k ZIP)
# Pengo Arcade Game (313k ZIP)
# Q*Bert Arcade Game (600k ZIP)
# Qix Arcade Game (476k ZIP)
# Scramble Arcade Game (600k ZIP)
# Time Pilot'84 Arcade Game (870k ZIP)
# Xevious Arcade Game (450k ZIP)
# Magic Wand Conjuring Trick
# Quiz game circuit
# E.S.P. Conjuring Trick
# Video game system using PIC18F252 (direct video generation)
# Video game system using SX28 (direct video generation)
# DIT shutterglasses controller
# Tic-tac-toe game using PIC16F628
# Archery timer
# PIC micro Tetris game
# Magic lamp, IR remote control jammer and other fun circuits (PDF)
# Lego Mindstorms Double Rotation Sensor
Infrared based schematics
# IR detector
# Infrared body heat detector
# Stereo IR audio receiver
# General purpose IR receiver
# Wireless IR headphone transmitter
# Wireless IR headphone receiver
# Infrared remote control shutter release system
# Infrared transmitter for locomotives
# Infrared gate for door
# Infrared circuits for remote control
# Serial port controller infrared transmitter (PIC16F628)
# IR Receiver (Amplitude Modulated IR)
# IR Transmitter for Audio (Amplitude Modulated IR)
# Digibox interface
# IR remote control
# Long Range Infrared Remote
# iRDA to TTL interface
# 40KHz light receiver (PDF)
# 40KHz TV-VCR repeater (PDF)
# Micro based PIR to IR remote converter
# IR-related ASCII Schematics V1.00
# Infrared remote transponder
# Build an Infrared night scope
# Decoding IR Remote Controls
# IR detector
# PC IR Remote Control Hardware
# PC IR Remote Control
# An Ambient-Light-Ignoring Infrared Active Motion Detector
# Infrared Transmitter and Receiver schematic diagrams
# Pyroelectric Infrared Sensor
# Minimal Infrared transmitter for PC
# Simple IR transmitter circuit
# Simple infra-red detector
# AVR (AT90S2313) serial port infrared receiver
# Infra Red Switch
# IR remote control extender
# IR Remote Control Extender Circuit (Mark 2)
# IR Remote Control Extender Circuit (Mark 3)
# IR Link
# IR remote control tester
# 40khz IR Tester
# 555 timer 40khz IR Oscillator
# IR detector / emitter
# Fire-Stick infrared remote control
# Simple infrared remote control
# Infrared / Ultrasonic beacon
# Implementing Infrared Object Detection
# IR detector for robotics
# Computerized Infrared Remote
Laser related power supplies and data transmission
# Light beam receiver for laser pistols
# 12V supply for He-Ne laser
# Laser diode transmitter
# Laser power supply
# Laser transmitter/receiver
# Laser harp
# Laser Telephone Receiver Circuit
# Fiber Optic Voice Communications
# Efficient Laser Supply
# 20MHz VCSEL 3mW laser test circuit (PDF)
# 10MHz to 20MHz laser light detector (PDF)
# Micro-power 40KHz burst laser diode driver (PDF)
# 40KHz laser burst detector (PDF)
# Modulated laser diode tester (PDF)
# Ar/Kr Ion Laser Power Supply
# Laser diode power supply circuits
# RS-232 Laser Transceiver
# HeNe laser power supply
# OPT201 Laser receiver
# OPT301 Laser receiver
# Laser transmitter schematics
# Diode Laser Power Supplies
# Laser bug circuit
# RS-232 Laser Transceiver
# Experimental laser data link
# Ar/Kr Ion Laser Power Supply Design
# Simple laser communicator
LED related schematics
# Big 7-segment LED display board with SPI interface
# LED Flasher
# LED pulser with audible output
# IR Illuminator
# Flashing Christmas LED display
# ICL7660 LED flasher
# LM3909 replacement using discrete components
# Color fade
# LEDs shimmer randomly as though on fire
# LED power supplies for AA cells
# 1.5 Volt LED Flashers
# AC Line Powered LEDs
# Astable Multivibrator
# 9 Second Digital Readout Timer
# 9 Second LED Relay Timer
# 16 Stage Bi-Directional LED Sequencer, other sequencer and flaser circuits
# 10 Stage LED Sequencer
# 28 LED Clock Timer
# Fading Red Eyes
# Two Transistor LED Flasher
# 16 Stage Bi-Directional LED Sequencer
# Expandable 16 Stage LED Sequencer
# LED Photo Sensor Circuit
# LED chaser
# 7 Segment LED Counter
# 7 by 10 LED Moving Sign ( 27C512 EPROM)
# Sequencial LED Flasher with Reversable Direction
# Tri Color LED Controller with Serial Interface
# 1.5V LED flasher B (PDF)
# Low current LED flasher (PDF)
# 1.5V LED flasher A (PDF)
# Flashing LED advertising badge (PDF)
# Flashing LED advertising badge (PDF)
# Pulsed LED test circuit (PDF)
# Low battery voltage flasher (PDF)
# Adjustable flashing LED
# PWM white LED drivers
# Heart of LEDs
# Christmas Star
# Christmas tree
# LED Counter
# PIC16F84 LED chaser
# PIC16F84 LED signboard
# PIC16F84 LED signboard 2
# White LED circuits
# Assorted LED circuits
# LED Mood Light
# LED Audio VU Meter
# Robot Beacon rotating light using PIC12C508
# LM3909 LED flasher
# Animated LED signboard (PIC16C84)
# Picxie 2 - 8x8 Animated LED Signboard
Lighting schematics
# Garden light switch
# DMX lighting and special effects
# Microcontroller Multichannel Light Dimmer
# Digital timer light switch
# Hand clap lamp control
# Radio controlled light switch
# Disco style Strobe Light
# Varying Brightness AC Lamp
# 12 Volt Lamp Dimmer
# 120VAC Lamp Chaser Using Solid State Relays
# Flashing Neons (NE-51 / NE-2)
# Sequencing Neons (NE-51 / NE-2)
# Touch Activated Lamp
# 220V Flashing lights
# Coutesy lamp
# Bedside lamp timer
# TRIAC light dimmer
# 12VDC Fluorescent Lamp Driver
# Strobe light
# Adjustable Strobe Light
# RHINO8 EL Sequencer
# Light Sequenced Candelabra
# Light timer
# 5W Fluorescent light intensity modulator (PDF)
# 1W Fluorescent lamp night light (PDF)
# Low-voltage light dimmer
# Light chaser
# 4-channel dimmer rack
# PIC16F873 light controller
# Disco light controller
# Neon desklamp
# Electronic night light
# Neon lamp dimmer
# LED Mood Light
# LX-800 Lighting system
# Xenon Strobe Light
# Lamp flasher/dimmer
Medical and health related schematics
# Snore alarm electronic device
# Heartbeat transducer
# ECG Amplifier
# EKG/EEG circuit
# Radiation Dosage-Rate Meter
# Heartbeat monitor
# Cranial Electrotherapy Stimulator
# Automated crib lights
# Jogging timer
# Tan timer
# Muscular Bio-stimulator
# Pedometer
# Simple lie detector
# EEG preamp, anti alias filter and isolation circuit
# Self Contained Electromyograph (EMG)
# Cardiac monitor
# Galvanic Skin Response (GSR) Schematic
# Brain-Wave Machine
# Lie detector
# Simple lie detector
# ECG project page
# The ESP SIM (Sound Impairment Monitor)
# Respiration system
Microcontroller based schematics
# PIC based packet radio encoder (PDF)
# RS485-Version of the SAB80C535-Microcontrollerboard
# PC IR receiver based on PIC16F84
# Record and play fast 1-bit sound on a PIC micro
# AT89C2051/4051scanning 7-segment display and keypad
# AT89C2051/4051 Driving dot LED
# AT89C2051/4051stepper motor interface
# AT89C2051/4051connecting dumb terminal
# Motorola 68K SBC (single board computer)
# 8051 SBC (single board computer)
# Simple RS232C Level Converter using Transistors
# Motorola 68HC11 evaluation board
# C-52 EVB Robot Controller
# Mains clock controller using AT89C2051
# AT89C2051/4051 Easy-Downloader
# AT89C51/52/55 Easy-Downloader
# PIC16F84 programmer
# PIC16F84 miniature real-time controller
# Isolated RS232 for PIC16F84
# PIC16F84 debugging terminal
# MiniLOGGER V1.0
# Analog datalogger based on T89C51RD2
# Atmel 89C Series Flash Microcontroller Programmer
# Atmel 89C2051 prototype board
# AT89C2051 real-time controller
# PIC12C508 Night-light saver
# AT89C2051 Night light saver
# Atmel 8051 Flash Based-Microcontroller Programmer
# AT89C2051 Digital thermometer and clock
# 4-Channel Timer using Atmel 89C4051 and MAX7219 display driver
# PIC16F84 CW decoder (PDF)
# 12C508 Smart Lock
# 80C31 stepper motor controller
# Build a PIC controlled DDS VFO, 0 to 6 MHz
# PIC controlled DDS VFO, 0 to 6 MHz
# Basic Stamp Lightning Activity Monitor
# Parallel AVR programmer
# PIC16F84 line following robot
# PIC16C505 IR / wireless remote control
# Automatic door opener with PIC12C508
# RS485-like multi-drop bus with half duplex serial protocol
# WWWpic2 - A web server in a PIC
# PIC16F84 web server
# 50 MHz frequency counter, voltage meter & SWR/PWR indicator
# Microcontroller board using the Atmel AVR AT90S8535
# Programmer PIC16F84,12C50x and EEPROM 24Cxx
# RDS Encoder - digital part
# PIC programmer for serial port
# Fully functional PS/2 mouse based on the PIC16F84
# PIC 18 programmer (PIC18F458, PIC18F452, PIC18C252, PIC16C745, PIC18F6620, PIC18F6720)
# Freign vocabulary recollector
# Illuminate holiday destinations on a world map
# Embedded system to send e-mails (small TCP/IP stack)
# Speaking clock using PIC & ISD device
# Speaking doorbell using PIC & ISD device
# Whistle detector using 8-pin PIC
# PIXpand
# PIC16F877 to IDE interface
# 68HC11 stepper motor control
# 90S2313 AVR Robot Board
# POCSAG encoder/decoder
# Network Time Protocol AVR Clock
# DS1820 Temperature Sensor Readout Unit
# Rotating Sprocket Wheel Generator (PIC16F84)
# Talking PIC - based on SP0256
# Serial to parallel converter using the AT89C2051
# AT89C2051 serial COMs to LED driver
# PIC16F877 Programmer And Development System
# DS1820 Arbiter V2.00 Schematic
# Microchip PIC ICSP implementation
# 101 AT Keyboard to ASCII Decoder using 68HC705J1A MCU
# LCD Serial Terminal
# Propellor clock (PIC16F84)
# Optical sensor using PIC12C508
# Interfacing S-7800A to PIC16F877
# A Scenix (and PIC) Programmer
# MMC to PIC16F876 circuit diagram
# 8088 maximum mode SBC
# EZ80 single board computer schematic (Z80)
# 8051 Development System Circuit Board
# Voice recording and message retrieval system
# Interfacing a GPS to an LCD using a Microcontroller
# Long-period watchdog timer
# PIC16F84 Range Finder Project
# Generate video signals in real-time using a PIC16F84
# PIC ICD
# PIC Project #1 - RS232 to I2C Interface
# Galvanic decoupling of I2C bus
# Programmer PIC16F84,12C50x and EEPROM 24Cxx
# Dual PIC16C84 prototype board
# Graphic LCD interface
# FSK modem with PIC16C84
# Talking YODA project (PIC16C84)
# PIC16F84/PIC16F87x-In-System-Programmer
# Microcontroller interface for 5KW microwave oven
# Using an I2C Serial EEPROM with a Basic Stamp 2
# PIC16F84 Based Morse Code Reader
# AVR-Based Serial Port IR Receiver
# Interfacing piezo elements to a microcontroller
# Victoria TAFE programmer (based on AT89C2051)
# JDM programmer
# PIC micro programmer
# Speech recognition using HM2007
# PIC microcontroller servo motor interface
# PIC micro multiple servo motor interface
# PIC16F84 countdown timer
# PIC16F873 ultrasonic range meter
# PIC16F873 Digital clock
# PIC16F873 remote display
# PIC16F84 stepper motor controller
# Way small web server
# PICADC - a free, PIC based "intelligent" A/D converter
# 8051 development system circuit board
# 8088 maximum mode single board computer (SBC)
# Basic 89C2051 / 89C4051 circuit diagram
# Debugging dump terminal for 89C2051 designs
# Easy debugging terminal
# Galvanic decoupling of I2C bus
# Circuits interfacing piezo elements to a microcontroller
# Driving a TRIAC using a PIC12C508
# Isolated RS232C for PIC16F84
# Microchip ICD (in-circuit debugger) circuit diagram
# Microchip PIC ICSP implementation circuit diagram
# Interfacing NMEA GPS to LCD using PIC16F84
# PIC ICD (in-circuit debugger)
# PIC16C71 morse code callsign generator
# PIC16F84 to LCD interface
# PIC16F84 I/O expander with PicBasic
# Scanning 7-Segment & Keypad
# 10-key serial keypad encoder
# Simple RS232C Level Converter using Transistors
# Talking PIC microcontroller using SP0256
# PIC-Programmer 2
# Connecting PIC12C508 8 to 93AA46 serial eprom
# KD7LMO Micro Beacon (PIC18F252)
# GPS LCD Display Project
# PIC16F84 LED chaser
# PIC micro LED projects
# PS/2 keyboard keystroke logger based on Atmel 89C2051
# Electronic distance meter based on Motorola 68HC908QY4
# Fan timer based on Motorola 68HC908QT2
# Atmel AVR and 8051 series ISP programmer
# AT89C2051 line-follower robot
# Night light saver (PIC12C508)
# USB and GLCD expansion board for 8051 SBC
# Basic stamp interface circuits
# Microcontroller sensor and actuator interfaces
# Giant money counter (PIC16F876)
# PIC12C509 logic gate replacement for nitrogen filler
# PIC demo board
# PIC12C509 Gym Timer
# PIC LCD and Keypad driver
# PIC12C508 Phase Controller for 2kW heater
# PIC16F84 TRIAC / IGBT brightness phase controller
# PIC16F84 pulse monitor with date/time output (ZIP)
# Programmer for the 68HC705C8 MicroController
# 27c801 EPROM Programmer Project
# LCD to PIC16C54 schematic
# 68HC11 based RDS decoder
# Acceleration monitor using ADXL202 and AVR
# 40+ MHz 5-digit frequency counter with an AVR 2313
# Interfacing DRAM to AT90S8515
# Temperature monitor/controller: AVR 2313 / DS1621
# PIC micro to ISA bus interface
# PIC16C84 VT-52 Emulator for Linux
# Microchip PIC ICD (in-circuit debugger)
# Tony Nixons Pocket Programmer (PIC)
# PicoWeb V5.1 (AT90S8515) tiny web server
# Atmel 89C2051 In-Circuit Programmer Schematic
# 8051 Development System Circuit Board
# 8051 Development System Circuit Board
# Microprocessor using Xilinx FPGA
# Temperature controlled based on AT89CX051
# I2C LCD interface
# AFSK 1200 Modem based on PIC16C620
# PicCon - Hidden Radio Transmitter Controller
# PIC16F84 tone generator with source code
# PIC16F84 tone generator
# PIC16F84 tone generator (6-Bit)
# AVR Beacon Super Keyer
# AVR Frequency Counter
# AVR Digital Voltmeter
# AVR Signal Generator
# Ser-Key 10-Key Serial Keypad Encoder
# 2-wire LCD interface using PIC16CF84
# PIC16F84 Serial I/O-expander with PicBasic
# RS 485-RPT Schematic
# Camera remote control system using Basic Stamp
# Low cost Atmel in-system programmer
# Ultra low-cost programmer for AT90S family
# AVR to USB interface
# Programable LCD counter with memory backup based on Atmel AT90S1200A
# Connecting AT90S2313 with LCD display 2x16 char and 4x4 keypad
# Atmel AVR RCEN fuse bit programmer
# Electronic safety lock based on ATtiny26
# GSM SMS remote control using AVR microcontroller
# 128x64 LCD Driver for AT90S2313 (ZIP file)
# Connecting LED to PIC Micro I/O pins (PDF)
# Microprocessor RS-232 Reset
# AT90S8515 experimenter board
# Multi-chip programmer for PIC microcontrollers
# Buffered PIC chip interface
# A PIC-Based Keyboard Emulator
# PIC-based robot
# ScanMate audio activated recorded
# PIC vacuum fluorescent display interface
# PIC18F252 bootloader schematics
# PIC16F876 Datalogger
# GPS Repeater
# Kodak DC-20 camera interface (PIC12C509)
# Kodak DC-20 camera interface (PIC16F84)
# PIC ICD in-circuit debugger circuit diagram
# PIC programmers for parallel port
# Wisp628 ISP Microchip PIC Programmer
# WLoader - PIC16F877 application loader / bootloader
# Nixie clock (PIC16F876)
# Zilog Z80 thermostat embedded web server
# Picxie 2 - 8x8 Animated LED Signboard (PIC16F84) Picxie 2 - 8x8 Animated LED Signboard
# Mp3 player module
# 10 tricks for interfacing to the PIC16C508
# Interfacing the PIC16C508
# PIC 5x7 display
# Analog to digital conversion notes
# Multi-chip programmer
Misc audio (also see Music, Amplifiers, Preamp)
# Electronic siren
# Two-tone siren
# Underwater microphone
# Code practice oscillator
# Noise generator
# Electronic whistle
# Twin-T Audio Sine Wave Oscillator
# 1.5V Audio Amplifier
# Low Power Op-Amp - Audio Amp (Intercom)
# 555 Tone Generator (8 Ohm Speaker)
# 3 Transistor Audio Amp (50 milliwatt)
# Low Frequency Sinewave Generator
# Automatic Charger for Battery Operated Hi-Fi Preamps
# Audio level indicator
# Room noise detector
# Amplifier timer
# Bell ring generator
# Amplified ear
# Precision audio millivoltmeter
# Six-channel Mixer and Amplifier
# Audio Signal Source
# Analog VU meter
# Voltage controlled amplifier
# Audio graphic equaliser
# Intercom preamp
# FET audio mixer
# Microphone mixer
# Tone control
# Digital volume control
# Sound level meter
# CMOS IC audio oscillator
# Three band Active Tone Control
# Automatic gain control (AGC) circuits
# Audio frequency meter
# Bull Horn
# Sound Mixer/Amplifier
# Very loud beeper (PDF)
# Digital noise generator (PDF)
# Tone display system
# Tube amplifier
# Condenser microphone hookup
# Phase shifter
# Paradoxical Sound Syntheizer
# Various tube crossover circuits
# Bias circuits
# Audio line isolator
# Dynamic microphone to electret microphone input
# Line level signal to microphone input adapter
# Simple two line output combiner
# Electret microphone powering circuits
# Use amplifier phono input as line level input
# Speaker signals to line level inputs
# Spring reverb unit
# Sine wave generator
# Simple amplifier
# 3-Band equalizer
# 6-Input mixer
# Doorphone intercom
# Stereo line driver
# Audio notch filer
# Peak reading audio level meter
# Tone control
# Speaker Microphone Circuit
# Electronic canary
# Electronic siren
# Microphone phantom power supply
# Voltage Controlled Mixer w/Modulator
# Dual Voltage Controlled Oscillator w/Modulator
# Dual Voltage Controlled Filter w/Modulator
# Stereo Ducker
# MS Stereo Decoder
# MS Stereo Microphone
# RIAA Equalized Stereo Phono Preamp
# Tube active crossover
# Improved PL tone decoder
# Magnetic cartridge amplifier
# LM358 preamp
# Sound detector
# Tone detector
# Tone generator
# Warbler
# Voltage Controlled Panner
# Low Noise Microphone Preamplifier
# Bridging Adapter For Power Amplifiers
# Simple Surround Sound Decoder
# Simplest Ever Amplifier Bridging
# Stereo Width Controllers
# Power Amplifier Clipping Indicator
# Phono Preamps For All
# Digital Delay Unit For Surround Sound
# Parametric And Sub-Woofer Equaliser
# High Quality Sound Mixer
# Loudspeaker Protection and Muting
# Direct Injection Box for Recording & PA Systems
# Minimalist Discrete Hi-Fi Preamp
# Signal Detecting Auto Power-On Unit
# Load Sensing Automatic Switch
# Amplifier thermal protection
# Active Sub-Woofer and Controller
# Balanced Line Driver & Receiver
# VU And PPM Audio Metering
# Variable Amplifier Impedance
# Linkwitz Cosine Burst Generator
# Low Noise Balanced Microphone Preamp
# Fast Audio Peak Limiter
# Subwoofer Equaliser
# Surround Sound Decoder Mk2
# Audio mixer
Miscellaneous schematics
# Ultrasonic radar
# Mobile APRS / GPS tracking system
# Electronic fish lure
# Ultrasonic sound receiver
# Experimental data transmitter for fiber optics
# Experimental fiber optic receiver
# Ion detector
# Darkness monitor
# Electroscope
# Simple event counter
# Geiger counter
# Light detector
# Short-circuit beeper
# LM 1800 FM stereo decoder
# Glitch detector
# MAX924 bar-graph level gauge
# Ultrasonic generator
# Negative ion generator
# ELF Monitor
# Chaos generator
# Simple BFO metal detector
# Voltage Comparator Information And Circuits
# Build Your Own Digital Setting Circles For Your Astronomical Telescope
# PL tone generator (NE567)
# Bat detector
# Bat detector microphone pre-amplifiers
# Full-duplex doorphone with 3 wires connection
# G Strain energy absorber
# RDS Encoder
# Toggle Switch Debounced Pushbutton
# RDS Encoder
# Discrete Set/Reset Flip Flop
# Monostable Flip Flops (one shot)
# Discrete Bistable Flip Flop
# Talking Morse Code Practice Computer
# Plant watering watcher
# Capacitance sensor
# Whistle responder
# Nocturnal animals whisker
# 12V DC electronic door chime
# Biasing Op-Amps into Class A
# Parasite zapper
# Bleeper box for time reference
# Analog computer
# BayComm packet modem
# Morse monitor
# HamComm modem interface
# Morse paddle keyer
# UV light box
# Hardware Random Bit Generator
# Random noise generator
# Analog pulse counter
# Analog opto-isolator
# Pulse width modulators (PWM)
# Pulse width to voltage converter
# Fantastic Atom Expander
# Black Light
# Computerize Your Room/Home
# Flash slave trigger
# Suddent ionospheric disturbance (SID) receiver
# A Visual CW Zero Beating Aid
# A two-way Morse practice set
# Magnetic levitation device
# Tesla power receiver
# Lazer Tag Equipment Modifications
# Garmin GPS data interconnect
# Inexpensive APRS Weather Station
# Walking robot
# Basic op-amp circuits
# Power line FM intercom
# Intercom circuit
# Lightning Storm Detector
# Large LCD Display Buffering Driver
# Text to speech converter
# Ion detector
# 1uS light pulse descriminator plus F to V converter (PDF)
# Broadband 2MHz optical fiber receiver (PDF)
# Modulated light received (PDF)
# 1uS light pulse receiver plus post amp (MISC)
# Broadband 5MHz optical fiber receiver (PDF)
# High-speed light receiver (PDF)
# Basement doorbell beeper (PDF)
# Time to dust indicator (PDF)
# Low-power optical interrupter (PDF)
# Simple nitrogen spark generator (PDF)
# Ultrasonic transducer oscillator circuit
# Build logic gates using discrete parts
# Jacob's Ladder
# Sudden Ionospheric Disturbance (SID) Receiver
# A selection of robotics projects
# Bat detector (new)
# Vat detector (old)
# Variety of quick designs
# Gold wafer (smartcard) programmer
# Making a FRED photopopper
# GPS receiver support kit
# Griffith Observatory Tesla Coil
# Fogger smoke machine
# Dinsmore 1490 digital compass
# Geiger counter
# Electric field disturbance monitor
# Inexpensive seismometer project
# Digital dial
# Speech recognition using HM2007
# GPS receiver interface
# Doorbell for the Deaf
# Electromagnetic field detector
# Insect Repellant
# High Quality Intercom
# Magnetic Gun.
# Metal detector
# Static Electricity / Negative Ion Detector
# Ultrasonic dog whistle
# Popular Electronics Ultrasound Detector
# An Inexpensive X-ray Machine
# Navigator 555A radio direction finder (RDF) circuit diagram
# Magnetic levitation circuit
# PE3342 Programmer Schematic
# u-Blox GPS receiver board
# Assorted digital circuits
# Basic electronic circuits
# Miscellaneous simple circuits
# Digital Call Sign Annunciator
# Monitor output from Motorola Oncore GPS engine in HP Z3801A in GPS Disciplined Oscillator
# Ultrasonic switch
# Sound finding cricket with phase detector
# Sound finding cricket
# APRS GPS tracker schematic (PIC16C73)
# Common Ground for Older VPW Circuit
# Very basic circuits
# Bat detector
# FCTS Project
# Smooth Tone Clickless CW Sidetone Generator
# Morse Code Beacon Keyer
# Lightning Activated Camera Shutter Trigger
# Simple metal detector electronic circuit
# Three Power Supplies for the Garmin GPS-20 Sensor Board
# Driving N-channel FETs from TTL
# Miniature Self-Powered Autonomous Robot
# Morse Code Practice Keyer 1
# Morse Code Practice Keyer 2
# 741 Light Sensor
# Fluid level detector
# The Aisin-Seiki GPS-Receiver (The "US$20 GPS")
# Morse code display
# Intercom schematic
# Scaling ADXL50 accelerometer output
Model and remote control schematics
# Snake throat muscle controller
# Handy cricket for robotic applications
# Incline Railway Control Circuit
# A Receive Signal Decoder
# 27Mhz toy car receiver
# 27Mhz toy car transmitter
# One ounce rocket ejection timer
# LED traffic lights
# Two-tone siren
# Proportional radio remote control
# Alf: The Robotic Matchbox car
# Seaplane schematic
# Model Rocket with Video Camera
# Signal breaking module
# RF serial link for robot
# PIC based rocket altimeter
# Robot with PIC16F84 brain & InfraRed eyes
# 0-10V control for RC servos
# Robotic microcontroller board
# Multi Rocket Launcher
# Model rocket launch controller
# Pad launch controller for model rockets
# Simple flashing light circuit
# Simple flashing light circuit
# A dual alternating flashing light circuit
# Simple flashing light circuit
# A dual tandem flashing light circuit powered by a 9 volt battery
# Simulate the Gyralite (dual flashing headlights).
# Simple train detector using ambient light and a photocell
# Simple charge rate monitor
# Deluxe charge rate monitor
# "CLONEPAC" memory module for Futaba 8UAF/8UAP
# Battery pack discharger
# Plane locator
# Plane locator 2
# Battery low voltage alarm
# Battery low voltage alarm 2
# Ultimate battery low voltage alarm
# R/C digital camera controller
# R/C helicopter camera
# Building an RF Remote Control System
# Motor walker circuit
# 250-amp Speed Controller for RC cars
# Spider robot electronic project page
# Two tone train horn
# R/C Emergency locator alarm
# Remote switch for radio-control aircraft accessories
# Radio Control Battery Backup
# Glow Plug driver for model engines
Motor and general control schematics
# Bridge head
# PWM motor controller
# Transistor relay driver
# Latching relay driver
# Relay delay circuit
# Touch switch
# Low voltage DC motor speed controller
# Flashing neon christmas lights
# Three input first response monitor
# Switch-on delay circuit
# Electronic thermostat
# LM3911 temperature controller
# Programmable light-activated relay
# Simple 10 Stage Control Box
# One component stepper motor driver
# Dual Stepping motor drivers using UDN2540
# PWM DC motor control with SG3525
# Stepper Motor Driver using TEA3718/3717
# Microstepping with PBM3960 and TEA3718
# DC Motor Driver with L6203
# Stepper Motor Driver using L298 and L297
# Several stepper motorol control circuits
# Wireless RF PWM dual motor controller
# H Bridge Motor Control Circuits
# Motor speed controllers
# Ceiling fan speed control
# Delayed off light switch
# Deoderizer fan timer
# Electronic Thermostat Relay Circuit
# Interfacing 5 volt CMOS to 12 volt loads
# Light Activated Relay
# CMOS Toggle Flip Flop With Relay(CD4013)
# 555 Timer Monostable Circuit Using Pushbutton
# Dual Channel Servo Pulse to H-Bridge Interface
# Current loop interface
# Switching solenoid driver
# Modular relay system
# Light/dark detector
# Pulse Width Modulation DC Motor Control
# Stepper motor controller
# Touch switch
# Pump controller
# H-Bridge motor controller (5 amps, 100 watts)
# Dual Channel Servo Pulse to H-Bridge Interface
# Servo pulse to PWM converter
# 12V Sump Pump Control
# Rolling code 4-channel UHF remote control
# DC Motor Speed Controller
# 3 Phase Brushless DC Motor Xtal Based Controller
# DC motor controller
# Garden moisture controller
# Overload Voltage Protection with Automatic Reset
# Pulse Width Modulator
# Pulse Width Modulator Motor Speed Control
# Pushbutton one-shot and latch (PDF)
# Charge coupled bi-directional power MOSFET relay (PDF)
# Finger touch activated switch (PDF)
# Machine vibration triggers hour meter (PDF)
# Solid state relay (PDF)
# Line-powered Xenon flash transmitter (PDF)
# 9V Xenon photoflash controller (PDF)
# AC switching with TRIAC from TTL
# Control 120VAC relay with TTL
# Driving a relay with a CPU
# Power-line Appliance Controller
# Simple Switched Servo Driver
# Combination-controlled, fully customizable RF remote control
# Thermoelectic controller (scriptable thermometer)
# Stepper motor positioner
# Stepper motor driver
# Thermostat
# Frequency switch
# PIC16F84 RF remote controller
# Stepper motor controller
# H-Bridge shematic
# DS1821 programmable thermostat
# Hot Water Tank Indicator
# Temperature monitor
# Cold activated switch
# Voltage comparator switch
# Dark activated switch
# DC Push Button Motor Control Circuit
# Light detector
# DC Motor Reversing Circuit
# Sound operated switch
# LDR light/dark activated relay switch
# Touch Switches
# 6090 digital decoder schematics
# Assorted relay control circuits
# Adjustable Voltage motor controller
# Serial servo controller
# DC Motor-Driver H-Bridge Circuit
# PWM Motor Speed Controller / DC Light Dimmer
# Constant Temperature Circuit
# PWM DC Motor Speed Control
# Solenoid starter
# CO2 controller for planted tanks
# Light activated relay
# Delayed shutter control for Kodak DC-20
# Gasoline generator automatic throttle controller
# Block power switching module
# MOSFET H-BRIDGE schematic and theory
Music related schematics (also see Audio)
# Audible metronome
# Visual metronome
# Peak-reading meters
# Octave screamer
# Amiga MIDI interface
# Apple Mac to MIDI synthesizer interface cable
# Apple Macintosh MIDI interface schematic (basic version)
# Apple Macintosh MIDI interface schematic (deluxe version)
# Standard MIDI to MIDI interface cable diagram
# Simple MIDI switcher
# MIDI interface / cable tester
# MIDI keyboard
# MIDI merger schematic
# 25-pin PC serial port to MIDI synthesizer interface cable
# 9-pin PC serial port to MIDI synthesizer interface cable
# Serial MIDI interface
# Microcontroller MIDI interface
# MIDI keyboard circuit
# Spring reverb unit
# Colour organ light
# MP3 Player
# Metronome and pitch generator
# Mini metronome
# Compact Flash / IDE MP3 Player MKI
# Simple colour organ
# Guitar fuzz effect
# 8 note tune player
# Colour (Sound) Organ
# Transisor organ
# BookPC Car MP3 Player
# Yet Another Mobile MP3 Player
# Wave Multiplier for music synthesizers
# Vibrato Circuit for Guitar, Steel, Bass, Etc.
# MIDI status indicator
# Zonk Machine and Treble Booster
# Simple line mixer
# Simple MIDI tester
# MIDI Controller Footpedal
# DIY Serial MIDI Interface (80C51/80C31 Version)
# Electronic metronome
# Sound Effects Generator
# Sound Effects Generator 2
# Digital Guitar Tuner
# Drum tone oscillators
# Analog MIDI synthesizer
# Spring reverb
# MIDI to CV interface
# Dual phantom power pre-amp
# Four channel fuzz box
# Theremin controller
# Vocal zapper
# MIDI drum machine project
# MIDI Drum Machine Analog Input Schematic
# Guitar Reverb Pedal
# Guitar Tremolo Unit
# Spring Reverb Unit For Guitar
# Ultra Simple Bass Guitar Compressor
# Vox AC30 Guitar Amplifier Simulator
# Guitar Vibrato Unit
# Musical Instrument (Expandable) Graphic Equaliser
# Midibox 64
# Mp3 player module
PC related schematics
# I2C printer port adaptor
# RS232C Level Converter
# PC electrically isolated RS422 interface using SN75176B or MAX485
# PC electrically isolated RS485 interface using MAX487 or SN75176B
# Short circuit protected power supply from PC 12V supply
# Isolated Full Duplex RS232C Interface
# RS232 DB-9 switch to flip between two serial ports
# DB-9 Connector to DB-25 (both RS-232)
# Mac Serial Port (RS-422 DIN-8) to RS-232 DB-25
# Modem Rockwell RCV336/ACF model V1433VQR ext.
# Genius Mouse schematics
# EEPROM programmer
# Commodore 64 24-bit parallel port interface with 8255
# Sound Card Interface with Tone Keyer
# RGB oo Monochrome converter - Matches impedance of PC to CCTV monitor
# Ericsson phone to PC serial port interface
# PC serial port receiver
# Parallel port relay interface
# ISA 48 I/O digital card
# PC infrared iRDA interface using TFDS 4500
# Jupiter card programmer
# USB to RS232 Dongle
# Parallel (Printer) Port Interface
# RS-232 line monitor and loopback cables
# The KD2BD Pacsat Modem
# A Serial Infrared Remote Controller
# PC Serial and Parallel Port Software and Interfaces
# Interfacing 16x2 character :LCD to parallel port
# RS-232 Protocol Analyser
# Interface cable for Casio QV-200 digital camera
# Radio clock for PC's
# A PC-Based LowFER Frequency Synthesizer
# General purpose 48-bit ISA parallel I/O card
# Power from RS-232 port
# PCI to ISA converter
# WatchDog for ISA Bus
# 4-channel 8-bit analog-to-digital converter for PC
# Printer port ADC
# Parallel port ADC based on MAX147
# Analog Signal Acquisition for PC Printer Port
# More accurate PC/AT clock
# Getting power from RS-232 interface
# Barcode scanner
# Build your own iRDA SIR Transceiver (Dongle) using MCP2120
# PC thermometer
# Dive computer interface
# Parallel port servo controller
# GPS receiver (Gamin, Eagle etc) to PC interface cables
# Connect two CD-ROM drives to one soundcard
# Headphone driving circuit for soundcards
# Get power out of PC parallel port
# Null Printer Adapter
# PC speaker volume control circuit
# How to get power from PC to your circuits
# RS-232 surge protection
# Simple RS-232 serial port buffer circuit
# Get power out of PC RS-232 port
# Sound Blaster Microphone Preamplifier
# Sega 3D glass interfacing circuits
# Convert Atari-style joystick to PC joystick port
# Fake Joystick circuit
# Using the joystick port as general purpose input
# Connect other circuits to PC joystick port
# Schematic of a standard PC joystick
# Simple PC SmartCard reader
# Fax to modem interface
# Analog to Digital Conversion (ADC) and Communicating with a PC
# Temperature sensor for PC
# Interfacing to an IBM PC/AT keyboard
# PC interface for point controller
# Linux Infra-red Remote Control (LIRC)
# Homebuilt RS232 LCD Interface
# Compter microphone
# CCD linear image sensor to PC parallel interface
# Laptop Computer Serial Port Power Booster
# Assorted computer interface circuits
# HamComm Interface
# Apple II/II+/IIe IDE Drive Interface
# Basic Stamp I & PC Relay Controller
# RS-232 to TTL cable
# Hi-Fi PC Speaker System
# IDE hard-disk interface for Amiga 500
# How to construct Garmin GPS receiver interface cables
# iRDA printer adapter
# 160 Baud ALDL Hardware Interface
# AT PC Power Supply 1
# AT PC Power Supply 2
# AT PC Power Supply 3
# AT PC Power Supply 4
# AT PC Power Supply 5
# iLINK Interface
# Digital Signals Decoding Interfaces
# 9-pin null modem cable
# RS232 - Lowe HF-225 interface
# RS232 to IrDA convertor using Vishay TOIM3232
# Interfacing PC sound card to SSB rig
# Supply Derives Power From 3-Wire RS-232 Port
# 24-line PC digital interface (PDF)
PDA interfaces and related schematics
# Casio interface circuits
# SHARP palm-top/hand-held to RS232 serial converter
# Interfacing ultrasonic range finder to BrainStem
# Hamamatsu UVTron Interface to a BrainStem
# Casio interface cable
# Casio organiser hardware
# MIDI interface for Palm computers
# MIDI interface for Palm cradle
# MIDI interface for Visor USB
# MIDI-USB Cradle for Visor (Deluxe, Platinum)
# MIDI interface for Visor
# Casio datalogger
# Interfacing ADXL202 accelerometer to PalmPilot
# PalmPilot audio interface
# PalmPilot cradle to modem adapter
# PalmPilot connector pinouts
# PalmPilot serial port interface
# PalmPilot memory schematics
# Aladin interface
# PalmPilot turbo boost guage interface
# IBM PC keyboard to PalmPilot interface
# Aladin interface using op-amp
# Wireless local network for PalmPilot (large PDF)
Power supplies and control schematics
# Power supply provides +5VDC regulated, +10VDC unregulated and 7.5VAC
# 13.5KV power supply
# Kirlian device supply
# LM317 adjustable power supply
# LTC1265 Nicad charger
# Single cell lithium battery charger
# Smart battery charger
# Battery charge indicator
# Lead acid trickle charger
# 12B Battery condition indicator
# Alkaline battery charger
# Alternative power source for Magellan GPS receivers
# Power Tool Torque Control
# Generating Negative 5 Volts from 9 Volt Battery
# LED Battery Condition Indicator
# LM317 Variable Voltage Regulator
# LM317 Regulator With Pass Transistor
# High Current Regulated Power Supply
# Simple Variable Voltage Source
# Various switching power supplies
# Variable 3 - 24 Volt / 3 Amp Power Supply
# 2 watt switching power supply
# Variable Voltage and Current Power Supply
# Low Power DC to DC Converter
# Constant Current Battery Charger
# Intelligent NiMH/NiCd switched mode fast charger
# Variable DC power supply
# Nicad battery charger
# Simple power supply
# Voltage converter
# Bench power supply
# Easy power supply
# Valve power supply
# 6V to 12V Converter
# Tesla coil / HV generator
# High Current Power Supply
# Dual Polarity Power Supply
# High Voltage High Current Power Supply
# Transformerless Power Supply
# Fixed Voltage Power Supply
# Voltage Inverter
# Voltage Inverter
# Dual power supply
# 1A Variable Regulated Power Supply
# Negative voltage generator
# 12V battery capacity tester
# NE555 Low Voltage Battery Disconnect Circuit
# 33 Volt DC To DC Converter
# Automatic AC voltage (110/240) selector
# Variable 0-5A Current Source
# Ground Fault Interupter
# Intelligent battery charger
# 12 Volt DC Load Control and Battery Protection
# Low battery indicator
# Variable power supply
# Switching Power Supply
# Low Power DC Quadrupler
# Surge protector
# Ultimate power supply
# Variable Regulated Power Supply
# Power reminder beeper (PDF)
# Unplugged power cord alarm
# Machine power loss beepter (PDF)
# Low-dropout 12V regulator (LM324)
# HV supply: 12VDC in, 12KV out
# Generating -5VDC from +5VDC
# Filtering PC bus POWER
# Bidirectionall power inverter
# Nagative voltage generation using 555 timer
# High current regulated power supply
# One 9V battery gives +18, +25, +33V
# +9V *and* -9V from one battery
# Battery charger
# Adjustable power supply using LM317
# Simple +5V power supply circuit
# 12 Vdc - 120 Vac Inverter Schematic
# +12V/-12V Power supply unit
# +/-12V -> +/-5V Power unit
# +5V Switching regulator (1)
# Switching regulator (2)
# Electric power controller
# +30V power supply with +5V
# +30V DC-DC converter
# DC/AC inverter (2)
# DC/AC inverter (1)
# PIC16F873 DC motor speed controller
# 12V 30A power supply
# Dual regulated power supply
# Fuse blown indicator
# Gyrator circuit
# Variable power supply
# LM317 Regulator Circuit
# Nicad battery charger
# Regulated 12V supply
# Unregulated power supply
# Snowmobile GPS power adapter
# Simple switching power supply
# Assorted power source and control circuits
# 12 volt battery monitor
# 12 volt power supply
# 5 volt power supply
# Battery voltage monitor
# LM3914 battery monitor
# Multiple voltage power supply
# Voltage doubler
# Voltage inverter
# PWM Motor Speed Controller / DC Light Dimmer
# PWM Motor/Light Controller
# Low Power LED Voltmeter
# PWM Motor/Light Controller
# PWM Motor/Light Controller variants
# Low Power LED Voltmeter
# Temperature Controlled NICD Charger
# Simple Capacitance Multiplier Power Supply For Class-A Amplifiers
# Simple DC Adapter Power Supply
# Variable Dual Lab Power Supply
# Battery Charger Ideas
# Power control for arc welders and other inductive loads
# Charger for gel lead acid batteries
# Nicad battery cycler
# Battery Characterizer
# Nicad Battery Discharger/Capacity Indicator
# 200 Watt Modified PC Power Supply 13.5 Volt 14 Amp
Radio-frequency schematics (also see Transmitters)
# UHF oscillator
# Economoy short-wave radio
# Linearized RF detector
# Two-band radio
# Shortwave conveter for scanners
# FM Bug
# AM Radio
# Toroidal coil RF shortwave receiver
# Crystal radio
# CW RECEIVER 40/80 meter CW receiver
# TRF AM Receiver circuit
# WLW 500KW Transmitter Schematic
# AM-Receiver for Aircraft communication (118.250MHz)
# AM receiver for aircraft communications
# 45-860MHz Radio receiver based on UV916-tuner
# 80 Meter CW ARDF receiver
# Four channel RF remote control
# CW zero beat indicator (PDF)
# Build your own VLF Receiver
# Receiver building blocks
# Simple wireless radio data link
# RX3302 receiver module schematic
# Superregenerative 27MHz receiver
# 49MHz walkie-talkie
# Convert 2m VHF FM PMR transceiver Motorola Radius M110 into an amateur radio
# Vibrating pocket bug detector
# 2MHz RF Oscillator
# 50-150MHz Overtone Oscillator
# Simple Op-Amp Radio
# UHF - 100W Transistorized amplifier
# 50MHz Converter
# RF front-end for triple conversion GPS receiver
# 2M - 20M transverter
# Improved CMOS RF PLL sythesizer
# Harmonic oscillator
# Direction finder system
# One transistor regenerative receiver
# Synthesized HF receiver
# TBA120 narrowband FM receiver
# TDA7000 receiver
# ZN414 receivers
# 10W HF linear amplifier
# 500W HF linear amplifier
# 3W HF QRP linear amplifier
# Phasing SSB exciter
# 500mW HF linear amplifier
# Generic VHF power amplifier
# 10.7MHz FM detector
# RTTY terminal unit
# Q-multiplier
# CMOS RF PLL sythesizer
# 3W FM Transmitter
# Crystal radio
# Op-Amp Radio
# Car radio tunes the Amateur Bands
# Crystal set that requires no antenna
# 80m Direct Conversion Receiver
# A compact L-match ATU for portable use
# Morse Adaptor for your VHF/UHF FM rig
# An end-fed antenna, L-match coupler and resistive bridge for HF
# AM Broadcast Band Regenerative Receiver
# 50 MHz to 146 MHz Converter
# Hear Amateurs on your Shortwave Radio!
# Compact 20 14 MHz direct conversion receiver
# Hear Amateurs on your FM Radio!
# RF actuated CW monitor
# LF to HF Converter
# Super 80 ultra-simple SSB receiver for 3.5 MHz
# Class B series modulator
# L-Band PHEMT LNA for GPS, Inmarsat etc
# Advanced VHF power meter
# The MRX-40 Mini Receiver
# 23cm Data Transceiver
# External antenna for the GPS-38, Magellan 2000, or Eagle Explorer GPS receivers
# AM Broadcast Band Active Antenna
# Active antenna with gain
# Ham Band VFO
# HF Signal generator
# Simple AM Radio Receiver & Amplifier
# Bug detector
# 175KHz inductive pulse receiver (PDF)
# 200-400 MHz voltage controlled oscillator
# AM/FM/SW active antenna
# RF Sniffer <.5 to >500 MHz
# Demodulator Schematic/Design
# AM BCB radio receiver
# Regenerative shortwave receiver
# 7MHz SSB Transceiver
# DSBSC (Double Side Band Supressed Carrier)
# Frequency Synthesizer
# Digital Automatic Gain Control (AGC)
# Four Channel Wireless Transmitter and Receiver
# Talking receiver
# PLL synthesizing oscillator (1)
# PLL synthesizing oscillator (2)
# PLL synthesizing oscillator (3)
# 2N2222 40 Meter CW/DSB Transceiver
# Yaesu FT-736R doppler compensation
# Phased lock loop schematic
# 30M PSK31 Transceiver
# SOP receiver (PDF)
# SOP direct conversion receiver
# Receiver
# 30m direct conversion receiver
# Popcorn direct conversion receiver
# 40m direct conversion receiver
# 80m direct conversion receiver
# Huge LED Antenna Direction Display (part 1)
# Huge LED Antenna Direction Display (part 2)
# 136 kHz direct conversion receiver
# One Watt 2.45 GHz Linear Amplifier
# 222 MHz Transverter
# VFO from 2001 ARRL Handbook, page 17.74
# VFO from 2001 ARRL Handbook, page 14.20
# Assorted RF circuits
# 14MHz SSB 10mW Transceiver
# Building a Simple LF Exciter
# Yaesu band decoder schematic
# 23cm Wide-Band FM data transceiver for high-speed packet-radio
# VLF radio receiver schematic
# 5 watt, 80 meter QRP CW Transceiver
# How to Build a 300MHz AM, RF Remote Control System
# RF Modem Robotics Project
# PLL FM transmitter
# ICOM CI-V interface with RS232 RTS to PTT
# Improved FM Stereo Modulator
# Smooth Tone Clickless CW Sidetone Generator
# Variety of receiver converter projects
# One transistor FM receiver
# 42 Mc Band to 88 Mc Band (retrofit converter) Project
# Crystal radio circuits including diode performance comparison
# 50MHz Assistant (Preamp & Power Amp.)
# Bug detector
# Basic RF oscillator
# Radio Control Electric Switch
# 56K RF Modem
# 80M ARDF direction finder
Solar-powered schematics
# Sun tracking circuit for solar arrays
# Solar power recharger
# Solar power supply
# Solar charge controller
# Solar robots
# Solar Tracker
# 1381 solar engine
# D1 solar engine
# FLED solar engine
# PM1 solar engine
# Solar car array controller schematic
# Solar car battery monitor schematic
# Solar car brake controller schematic
# Solar car main controller schematic
# Solar car display controller schematic
# Solar car electrical design and circuit index
# Portable solar battery charger
# Sensor Electronic Tracker with H-Bridge Drive
# Sensor Electronic Tracker with Simple Solar Charge Controller
# Solar tracking control system
# LED7 solar tracker
# Solar step-down regulator
# Zener-based solar engine
# AA battery solar charger
# AA battery solar charger
# Solar Panel Charge Controller / Low Voltage Disconnect Circuit
# Solar Panel Current Meter
# SCC2 10 Amp Solar Charge Controller
# Solar Charged LED Flashlight
# AA battery solar charger
# Solar Panel Charge Controller / Low Voltage Disconnect Circuit
# Solar Panel Current Meter
# Solar cell Nicad charger
# Solar powered dock lamp flasher
Telephone and intercom related schematics
# Telephone recording circuit
# Infinity Transmitter Schematic and Plans
# Digisound ring modulator
# Incoming call indicator
# Telephone Ring Generator Using 60Hz Power Transformer
# Telephone Ring Generator Using Switching Power Supply
# Telephone In-Use LED Indicator
# Telephone In-Use Relay Circuit
# Telephone Audio Interface
# Telephone interfacing / caller ID using a PIC microcontroller
# Home made PBX / PABX
# Ringing Phone Light Flasher
# Phone Busy Indicator
# FM Telephone Bug
# Cut Phone Line Detector
# Simple Phone Tap
# Telephone Hold Button
# Telephone Recorder
# 300 baud modem circuit schematic
# DTMF Generator/Decoder
# Interface cables for various cell phones
# Telephone music on hold box
# Telephone ring controlled relay
# 1-line telephone status indicator (PDF)
# Line in use indicator (PDF)
# 4-line telephone status indicator (PDF)
# Caller ID decoder
# Telephone in use light
# Detecting a telephone RING
# Phone In-Use Light
# Phone to audio interface
# Phone Off-Hook Indicator
# 'phone rang' indicator light
# Phone Line to Audio
# Phone in-use
# Telephone Line Monitor
# Use old phones as an intercom
# Phone-In-Use indicator
# Hold function for Telephone
# Digital/Standard Phone Line Tester
# Caller ID decoder part 1
# Caller ID decoder part 2
# DTMF decoder / logger
# FM telephone bug
# Universal telephone hold
# Talking phone dial monitor
# Telephone line simulator
# Telephone privacy adapter
# Telephone ringing circuits
# Simple circuit to connect telephone equipment to audio mixer
# NCDS Interface Schematic for Nokia 3110, 8110, 8110i
# Assorted telephone circuits
# Greek telecard reader
# Phone ring circuit schematic
# Cut phone line detector
# Telephone autodialler
# Taxi phone automatic dialler
Test equipment schematics
# Audible continuity tester
# Wire tracer
# Signal generator for signal tracer
# Electronic level
# Digital volt meter
# Adjustable continuity tested
# Frequency counter
# Tri-Waveform Generator
# 220V live wire-in-wall scanner
# Owens Bridge Inductance Measurement Device
# ESR Meter
# Line Output / Flyback transformer tester
# PC-Based Digital Storage Oscilloscope (DSOA)
# PC Based Digital Storage Oscilloscope Mk3
# Simple 6-Digit 40MHz Frequency Counter Module
# Automatic stud detector
# Capacitance meter
# Capacitance meter
# AC Line Current Detector
# Triangle and Squarewave Generator
# Signal tracer / injector
# Voltage probe
# Live line detector
# Grid dip meter
# PCB VSWR bridge
# Electric field & leakage detector
# Simple polarity detector
# RCM710 Electronic Scale
# 3 - 12 MHz Signal Generator
# Some simple test equipment to build
# RF Power Meter for the QRPer
# Dip Oscillator for HF
# Two Tone Audio Oscillator (use for SSB tests)
# Simple pH meter
# Temperature compensated pH meter
# pH meter with calibration
# Four Channel Oscilloscope Adapter
# Arbitrary Waveform Generator
# Digital Pressure Gauge
# Remote Field Strength Meter
# Digital frequency counter
# Function generator
# High / Low indicator
# AC/DC LED Indicator
# Micro ohm meter
# Micro volt probe
# MOSFET tester
# Power factor meter
# Ramp generator
# LASER/LED light output intensity meter (PDF)
# Frequency and capacitance meter
# Resistor decade box
# Simple light sensor adapter for oscilloscope
# Time Domain Reflectometer (TDR)
# 40MHz frequency counter using Atemel AVR 2312 microcontroller
# pH Meter
# Multi Wire Cable Tester
# Connection tester
# EMF field probe
# Function generator
# Logic probe
# Zener diode tester
# Mini DDS (direct digital synthesizer)
# LCD frequency counter (PIC16F84)
# Pulse Reading Logic Probe
# Pink Noise Generator for Audio Testing
# Audio Millivoltmeter
# Audio Test Oscillator
# Full Featured Transistor Tester
# Opamp Design and Test Board
# Microphone Circuit Test Oscillator
# Distortion Analyser
# Self Oscillating Amplifier for Distortion Testing
# 120MHz frequency counter
# Capacitance meter that connects to multimeter
# Transistor tester and signal injector
# Continuity tester
# Square wave oscillator (555)
# Build a Magnetic Field Immunity Tester
# 555 Timer IC Tester
# 555 go / no-go tester
# 12V Lead-Acid Battery Monitor
# Continuity tester 2
# Continuity tester
# Logic probe
# 4-channel DSO for oscilloscope
# Field strength meter for the 137 kHz band
# In-circuit electrolytic tester
# PIC logic probe with pulser
Timing, oscillators etc. (schematics)
# Budget timer
# Long period timer
# 555 time delay circuit
# Low frequency clock
# Countdown timer with relay
# DDS using AD9835
# 1 Second Time Base From Crystal Osc.
# Power-On Time Delay Relay Circuit
# Low Voltage , High Current Time Delay Circuit
# Power-Off Time Delay Relay Circuit
# Generating a Delayed Pulse With a dual 555 Timer
# 1KHz Sinewave generator
# Timed beeper
# GPS receiver clock circuit
# Time Delay Relay
# Time Delay Relay
# Wide-swing Variable Crystal Oscillator
# Circuit that momentarily closes a pair of contacts at long intervals
# Onboard Fogger Timer
# Colpitts 1 to 20 MHz Crystal Oscillator
# Divide By 1-1/2 Circuit
# Simple sinewave generator
# Two Transistor Sine Wave Oscillator
# 10 Hz to 10 Khz VCO with Square and Triangle wave
# Line powered 60Hz clock generator (PDF)
# Micro-power pulse generator (PDF)
# Darkroom camera shutter timer
# Divide by 1.5 counter (PFD)
# High-output square wave generator (PDF)
# D Flip-flot one-shot circuits (PDF)
# Clock divider
# Clock doubler
# CMOS oscillator
# Crystal 32.768KHz CMOS Oscillator
# Crystal oscillator
# Cheap 40KHz clock
# Stable 40KHz clock
# 'Rounding Off' a square wave
# Switch debounce using 555
# Square wave to sine wave converter
# Day / Night / 24 Hour Select Sensor
# One transistor timer
# Variable timer
# Micropower pulse generator (PDF)
# Square wave oscillator
# Triangle wave oscillator
# Sawtooth wave oscillator
# Sine/Cosine wave oscillator
# 555 timer
# 555 oscillator
# Stable multivibrator (IC)
# Stable multivibrator (Transistor)
# Timer based on Microchip PIC16F628
# Push Button Switch Debouncer
# Square wave oscillator
# 5 to 30 Minute Timer
# NE555 Basic Monostable
# Mini DDS (Direct Digital Synthesis)
# Astable Multivibrator
# High Precision GPS/TV controlled Reference Oscillator
# TV based Receiver for a Standard Frequency Generator
# AD9852 DDS schematic
# A GPS receiver based frequency standard
# Monostable multivibrator
# Clock generator
# 555 Timer Tutorial + Circuits
# Versatile electronic timer
Transmitter schematics (also see RF)
# Li'l 7 AM Transmitter Schematic
# Wireless microphone
# XTAL locked tone transmitter
# AM oscillator for wireless microphones
# Wireless microphone
# 1W CW Transmitter
# 433MHz transmitter using SAW resonator
# A 3m (100 MHz) small bug
# Basic FM Transmitter
# Micro Power AM Broadcast Transmitter
# FM Beacon Transmitter (88-108 MHz)
# 1 valve CW transmitter
# 250mW HF CW transmitter
# 2 valve CW transmitter
# Transmitter using LM317
# 5 Watt HF CW transmitter
# Simple FM microphone
# FM bug
# High power FM bug
# 27MHz AM/CW transmitter
# Easy 2-meter transmitter
# QRP HF transmitter
# Spark gap transmitter
# QRP SSB transmitter
# Crystal controlled FM transmitter
# 150mW FM transmitter
# FM transmitter
# Two Valve 40m CW Transmitter
# Frequency agile 80m CW QRP transmitter
# 80 metre DSB transmitter
# One Valve CW transmitter
# Simple Low FER Transmitter
# 7Mhz AM/CW Amateur Radio Transmitter
# VHF FM transmitter
# Simple FM transmitter
# Wireless microphone
# Shortwave radio transmitter
# 175KHz inductive pulse transmitter (PDF)
# 7MHz QRP transmitter
# Small Radio Transmitter
# FM Telephone Transmitter
# Tracking transmitter
# 5W PLL Transmitter
# Miniature FM transmitter
# Sensitive FM transmitter
# Simple RF transmitter
# 1.5 volt tracking transmitter
# Tracking transmitter
# Micro Power FM Broadcasting Circuits
# Low Power FM Transmitter
# RF/SS Handie Hopper Transmitter Schematic
# 30-Meter QRP Transmitter for Morse Code
# Miniature FM Transmitter #1
# Miniature FM Transmitter #2
# Miniature FM Transmitter #3
# Light sensing RF transmitter
# Micro-Spy with FETs
# Micro-Spy with USW
# Micro-Spy with TTL
Video related schematics
# Video Clock Superimposer
# Video clock superimposer using PIC16C711
# Simple AV (audio / video) wireless transmitter
# Audio / video distribution amplifier
# 10GHz video link
# Experimental macrovision remover
# 8 x 8 Audio-video switch
# VHF/UHF TV modulator
# LH0032 video amplifier
# LM359N video amplifier
# Macrovision code remover
# Driver for multiple VGA monitors
# CCD (charge coupled device) support board
# Closed-Caption Decoder
# PIC-Tock video clock
# Video/Audio Wireless Transmitter
# Video signal amplifier
# RGB video digitizer
# Color Bar Generator
# Microcontroller test pattern generator
# NTSC Video Distribution Amplifier
# Commodore RF modulator
# Video signal edge enhancement
# Video amplifier
# Video/Audio Wireless Transmitter
# 4 Stage 555 Timer for Video Cam Control
# Digital volt meter with video output
# TV/Radio antenna cable galvanic isolator
# S-video to composite video adapter
# VGA converter for video projectors and fixed frequency monitors
# VGA to TV converter
# VGA to PAL and NTSC converter
# PIC micro frame grabber (TDA8708)
# Low cost audio/video modulator and transmitter
# Many video amplifier circuits includiing transmission over UTP (PDF)
# Commodore 64 Video Modulator 251025 Schematics
# Commodore 64 Video Modulator 251696 Schematics
# TV RGB signal output from a SVGA graphics card
# Macrovision removal
# AVR (AT90S2313) composite PAL colour bar generator
# Homebuilt video digitizer Mark I
# Homebuilt video digitizer Mark II
# TV transmitter (PDF)

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