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Note that all these links are external and I canno provide any support on the circuits or offer any guarantees to their accuracy. Also note that some of the circuits are illegal to operate in most countries, please check your local regulatory bodies if concerned. Other circuits are dangerous to construct and should not be attempted by the inexperienced.

Alarms and security related schematics

  • Intermittent alarm generator
  • Burglar alarm
  • Moisture alarm
  • Automatic Entry Control System
  • Fridge door alarm
  • Electronic door code lock (PIC16F84)
  • Ultrasonic remote control & alarm system
  • Wire loop alarm
  • Proximity alarm
  • Electronic lock
  • 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
  • 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
  • Alarm loop sensor (LM3915)
  • Touch triggered alarm
  • Universal alarm system
  • Warning strobe flasher for alarm systems
  • Collection of alarm circuits
  • PIR motion detector light controller
  • Micropower wireless motion detector transmitter
  • Touch activated alarm system
  • Combination Lock (Simple Version)
  • Combination Lock (PIC16F84)
  • Low power RFID transponder

    Audio power amplifier schematics

  • 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
  • Amplified ear
  • 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 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
  • JLH Headphone Amplifiers
  • 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
  • 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
  • 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

    Audio preamp circuits

  • mu-stage microphone preamp
  • Solid state microphone preamp
  • Dynamic microphone preamplifier
  • Sound blaster preamplifier
  • Phono preamp
  • Low impedance microphone amplifier
  • Masthead preamp
  • Preamplifier for microphone or guitar use
  • Microphone amplifier
  • RIAA phono amplifier
  • 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
  • Low impedance microphone amplifier
  • Hi-Fi Preamplifier
  • Crown IC-150A Preamplifier (pdf)

    Automative, car and motorcycle schematics

  • Race cart or car datalogger
  • Analog Tachometer for Gasoline Engines
  • Headlight On reminder with Light
  • Flashing High Intensity LED 3rd Brake Light
  • Adaptive Windscreen Wiper Control
  • Car clock
  • Car message display
  • Car interval wiper
  • Safety indicator light
  • Speed limit alert
  • Car power supply for MP3 player
  • Car power supply for MP3 player Mk 2.5
  • Grand Cherokee Off-Highway Lights
  • Engine control unit schematics
  • Portable CD Player Adapter For Car
  • Car battery charger
  • Wireless Auto Tachometer
  • Electronic auto stethoscope
  • Turn signal alarm
  • Motorcycle turn-signal system
  • Cigarette lighter 9V adaptor
  • Alternator Signal Detector
  • Automotive alarm system
  • Road ice alarm
  • Automotive Anti-Lock Brake Control Driver
  • PC based EFI programmer
  • 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
  • Car burglar alarm
  • Auto to trailer lights interface
  • Car locator (RF based receiver / transmitter)
  • 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
  • Economy radar detector
  • Combination lock for car liftgate
  • BMW motorcycle side stand protection mod

    Data acquisition and data logging schematics

  • Datalogger based on 68HC11
  • 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
  • Air flow detector
  • Air flow detector
  • Strain gauge sensor
  • ADC0804LCN 8-bit A/D converter
  • Web-based thermometer project
  • ADC-x RS232 Interface Schematic (pdf)
  • 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
  • Network of RS485 temperature sensors
  • Digital compass schematic
  • Temperature datalogger
  • Accelerometer Schematic
  • Serial Port A/D-converter
  • Centronics port D/A converters and low-pass filter
  • LCD Thermometer
  • Wireless Liquid Level Sensing for Restaurant Applications
  • Pressure Sensor-Based Altimeter Circuit
  • Ultrasonic range finder circuit
  • 8-bit analog to digital converter (ADC)
  • Clockless analog to digital converter
  • Low-resolution BCD analog to digital converter
  • AD converter with tracking / sample-hold
  • Analog to digital converter with switching preamplifier
  • Simple flash A/D converter
  • Low-cost A/D converter
  • Logarithmic A/D encoder
  • 1-wire barometer
  • Water-level sensor
  • Addressable ADC
  • Wireless weater station

    Filter schematics

  • Voltage Controlled State Variable Filter
  • Galaxy Noise Filter
  • RC Notch 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
  • Single-Supply Sallen Key Notch Filter
  • Single-Supply Twin T Butterworth Low Pass 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
  • Voltage controlled filter and oscillator
  • "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
  • Video ping pong game
  • Big Mouth
  • MBC5/CPLD for the GameBoy
  • GameBoy Camera Parallel Port Interface
  • Wireless quiz show system
  • 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 coin tosser
  • Electronic craps game
  • First response monitor
  • Electronic Nicad glow plug driver
  • PowerGlove Interface
  • 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
  • Applause meter
  • Fart strength meter
  • Model train throttle control
  • DIT shutterglasses controller
  • Furby circuit
  • 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
  • USB to infrared adapter
  • Infrared remote control shutter release system
  • Infrared transmitter for locomotives
  • IR remote control system for PC
  • IR Receiver (Amplitude Modulated IR)
  • IR Transmitter for Audio (Amplitude Modulated IR)
  • Infrared gate for door
  • Infrared circuits for remote control
  • Serial port controller infrared transmitter (PIC16F628)
  • Digibox interface
  • IR remote control
  • IR remote control jammer
  • Long Range Infrared Remote
  • LCD + IR circuit schematic
  • Infrared body heat detector
  • Stereo IR audio receiver
  • General purpose IR receiver
  • Wireless IR headphone transmitter
  • Wireless IR headphone receiver
  • 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
  • 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
  • Infrared repeater
  • 40khz IR Tester
  • 555 timer 40khz IR Oscillator
  • IR detector / emitter
  • Fire-Stick infrared remote control
  • Simple infrared remote control
  • Infrared / Ultrasonic beacon
  • Infrared transmitter / decoder
  • Infrared logic probe
  • Implementing Infrared Object Detection
  • Infrared gate detector
  • Infrared relay with relay output
  • IR detector for robotics
  • Computerized Infrared Remote

    Laser related power supplies and data transmission

  • Laser power supply
  • Laser transmitter/receiver
  • Laser harp
  • Simple laser communicator
  • LASER listening device
  • LASER transmitter / receiver
  • RS-232 Laser Transciever
  • HeNe laser power supply schematics
  • Light beam receiver for laser pistols
  • 12V supply for He-Ne laser
  • Laser diode transmitter
  • 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
  • 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
  • Diode Laser Power Supplies
  • Ar/Kr Ion Laser Power Supply Design
  • Laser light show
  • Laser light show pattern generator
  • Simple laser communicator

    LED related schematics

  • Variety of LED circuits
  • Winking LEDs
  • LED flashing light
  • LED initials
  • 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)
  • LED Flasher
  • LED pulser with audible output
  • IR Illuminator
  • Flashing Christmas LED display
  • ICL7660 LED flasher
  • 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
  • LED Stroboscope - Maintains constant brightness at all flash rates
  • White LED circuits
  • Assorted LED circuits
  • LED Mood Light
  • LED Audio VU Meter
  • Scrolling LED sign
  • 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
  • Flashing flashlight
  • Flashing road baricade for construction workers
  • Hand clap lamp control
  • 600W 120VAC lamp dimmer
  • 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
  • Smart 12V light dimmer (pdf)
  • 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
  • 10-channel follower for Austin Hotel
  • 12V Color organ and reverb unit
  • 8-bit digital firing circuit
  • Audio trigger circuit for light chasers
  • Christmas star
  • Electronic candle
  • Electronic candle V2
  • Fluorescent light dimmer
  • Strobe light
  • LED Mood Light
  • LX-800 Lighting system
  • Xenon Strobe Light
  • Lamp flasher/dimmer
  • Efficient dc lamp dimmer - 74C14
  • Instrument panel lamp dimmer control

    Medical and health related schematics

  • Snore alarm electronic device
  • EKG/EEG circuit
  • Radiation Dosage-Rate Meter
  • Heartbeat monitor
  • Cranial Electrotherapy Stimulator
  • Automated crib lights
  • Jogging timer
  • Tan timer
  • Muscular Bio-stimulator
  • Pedometer
  • Heart rate monitor
  • ECG amplifier
  • Simple lie detector
  • Simple lie detector
  • Heartbeat transducer
  • ECG Amplifier
  • 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
  • PC-based biofeedback monitor
  • Pain field generator
  • 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
  • Simple RS232C Level Converter using Transistors
  • 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
  • Atmel 89C Series Flash Microcontroller Programmer
  • AT89C2051 real-time controller
  • PIC12C508 Night-light saver
  • AT89C2051 Night light saver
  • Atmel 8051 Flash Based-Microcontroller Programmer
  • AT89C2051 Digital thermometer and clock
  • PIC16F84 CW decoder (PDF)
  • 12C508 Smart Lock
  • Build a PIC controlled DDS VFO, 0 to 6 MHz
  • PIC controlled DDS VFO, 0 to 6 MHz
  • Basic Stamp Lightning Activity Monitor
  • TCP/IP stack and WWW server in a PIC16F84
  • PIC16F84 line following robot
  • WWWpic2 - A web server in a PIC
  • PIC16F84 web server
  • 50 MHz frequency counter, voltage meter & SWR/PWR indicator
  • Programmer PIC16F84,12C50x and EEPROM 24Cxx
  • RDS Encoder - digital part
  • PIC programmer for serial port
  • PIC 18 programmer (PIC18F458, PIC18F452, PIC18C252, PIC16C745, PIC18F6620, PIC18F6720)
  • Freign vocabulary recollector
  • 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
  • POCSAG encoder/decoder
  • Network Time Protocol AVR Clock
  • DS1820 Temperature Sensor Readout Unit
  • PIC16C505 IR / wireless remote control
  • RS485-like multi-drop bus with half duplex serial protocol
  • 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
  • PIC18 Schematic
  • Atmel AVR programmer
  • Microchip PIC ICSP implementation
  • 101 AT Keyboard to ASCII Decoder using 68HC705J1A MCU
  • DTMF tone decoder using Basic Stamp
  • LCD Serial Terminal
  • Propellor clock (PIC16F84)
  • World's smallest PIC programmer
  • PIC X1 schematic (PIC16F877)
  • 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)
  • Voice recording and message retrieval system
  • 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
  • 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
  • AT89C2051 line-follower robot
  • Night light saver (PIC12C508)
  • Basic stamp interface circuits
  • PIC16F84 sound controlled Christmas lights
  • 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
  • PIC16C84 VT-52 Emulator for Linux
  • Microchip PIC ICD (in-circuit debugger)
  • Tony Nixons Pocket Programmer (PIC)
  • PicoWeb V5.1 (AT90S8515) tiny web server
  • 8051 Development System Circuit Board
  • 8051 Development System Circuit Board
  • Temperature controlled based on AT89CX051
  • 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
  • AC lamp dimmer for Basic Stamp
  • Microcontroller multi channel light dimmer
  • PIC16C63 MIDI controlled light dimmer
  • No parts PIC micro programmer
  • Connecting LED to PIC Micro I/O pins (PDF)
  • Microprocessor RS-232 Reset
  • AT90S8515 experimenter board
  • A PIC-Based Keyboard Emulator
  • PIC-based robot
  • ScanMate audio activated recorded
  • PIC18F252 bootloader schematics
  • Remote control encoder/decoder with PIC16C620 & PIC12C508
  • Electronic door codelock with PIC16F84
  • Automatic door opener with PIC12C508
  • Infra/radio remote control transmitter/receiver with PIC
  • Codelock
  • Automatic door opener (PIC)
  • PIC16F876 Datalogger
  • GPS Repeater
  • Kodak DC-20 camera interface (PIC12C509)
  • Kodak DC-20 camera interface (PIC16F84)
  • Remote control for Raymarine ST4000 Autopilot
  • PIC programmers for parallel port
  • Wisp628 ISP Microchip PIC Programmer
  • Nixie clock (PIC16F876)
  • Zilog Z80 thermostat embedded web server
  • Picxie 2 - 8x8 Animated LED Signboard (PIC16F84) Picxie 2 - 8x8 Animated LED Signboard
  • 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)

  • Pink noise generator
  • A Schottky-based Saw-to-Tri converter
  • Saw to triangle converter
  • Improved saw to triangle converter
  • Voltage controllable LFO
  • White noise generator
  • Low Frequency Sinewave Generators
  • Horror movies sound effects
  • Sound amplifier
  • Temperature sensitive oscillator
  • 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
  • Ultrasound detector
  • Electronic siren
  • Two-tone siren
  • Underwater microphone
  • Code practice oscillator
  • Noise generator
  • Electronic whistle
  • 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
  • NHT subwoofer amp
  • 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
  • Fender Champ Replica
  • Keyboard scanned 8-tone generator
  • Audio test station
  • Audio tone VU meter
  • Pink noise generator
  • 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
  • 110 dB beeper - 74C14
  • Audio output level meter
  • Surround Sound Decoder Mk2
  • Stereo compressor
  • Audio mixer

    Miscellaneous schematics

  • Ultrasonic radar
  • How to generate a Rotating Field
  • Chaos generator
  • Simple BFO metal detector
  • Voltage Comparator Information And Circuits
  • Electromagnetic Levitator
  • Build Your Own Digital Setting Circles For Your Astronomical Telescope
  • PL tone generator (NE567)
  • Bat detector
  • Bat detector microphone pre-amplifiers
  • DGPS receiver
  • 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
  • Full-duplex doorphone with 3 wires connection
  • Analog computer
  • BayComm packet modem
  • Morse monitor
  • HamComm modem interface
  • Morse paddle keyer
  • UV light box
  • Voice activated tape recorder switch
  • 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
  • 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
  • Vibrating Pocket Bug Detector
  • Basic op-amp circuits
  • 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
  • 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
  • Griffith Observatory Tesla Coil
  • Fogger smoke machine
  • Dinsmore 1490 digital compass
  • Geiger counter
  • Electric field disturbance monitor
  • Inexpensive seismometer project
  • Digital dial
  • 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
  • Magnetic levitation circuit
  • PE3342 Programmer Schematic
  • Schmidt Trigger
  • u-Blox GPS receiver board
  • Assorted digital circuits
  • Basic electronic circuits
  • Miscellaneous simple circuits
  • Digital Call Sign Annunciator
  • Ultrasonic switch
  • Sound finding cricket with phase detector
  • Sound finding cricket
  • APRS GPS tracker schematic (PIC16C73)
  • No loss capacitor
  • Discrete logic decimal to BCD converter
  • Doorbell extender