Combining PC with electronics. SCADA

• 160 Baud ALDL Hardware Interface
• 300/1200 baud BAYCOM MODEM (revision and improved)
• 3-axis stepper motor controller for PC parallel port
• 7 segment rolling display using PC
• 8-way relay interface board for PC parallel printer port
• 9-pin null modem cable
• A Serial Infrared Remote Controller
• Analog Signal Acquisition for PC Printer Port
• Apple II/II+/IIe IDE Drive Interface
• Assorted computer interface circuits
• Basic Stamp I & PC Relay Controller
• Bell 202 and CCITT V23 Compatible FSK Modem Circuit
• Build your own iRDA SIR Transceiver (Dongle) using MCP2120
• Building an Infrared Transmitter for Your PC
• CCD linear image sensor to PC parallel interface
• Circuit for interfacing a relay / solenoid to a PC based on a 2N7000 FET
• Circuits to computerize your room/house
• Commodore 64 24-bit parallel port interface with 8255
• Computer Controlled Frequency Counter/Logic Probe
• Computer microphone
• Connect other circuits to PC joystick port
• Connect two CD-ROM drives to one soundcard
• Convert Atari-style joystick to PC joystick port
• Dallas DS1620 based USB Digital Thermometer
• DB-9 Connector to DB-25 (both RS-232)
• DCF77 receiver to PC RS232 serial port interface
• Ericsson phone to PC serial port interface
• Ethernet interface for Commodore 64 computer
• Extremely simple ADC for the PC (parallel port interface)
• Fake Joystick circuit
• Fax to modem interface
• FM radio for a PIC (uses TDA7000 IC which is now obsolete)
• FM radio with PC parallel port interface
• Game boy camera PC serial interface
• General purpose ISA interface card for PC
• Get power out of PC parallel port
• Get power out of PC RS-232 port
• Getting power from RS-232 interface
• GPS receiver (Gamin, Eagle etc) to PC interface cables
• HAMCOM & SoundCard MODEM using serial- or soundcard audio
• HAMCOM (SSTV, RTTY, FAX...) modem using PC-speaker for TX
• HAMCOM (SSTV, RTTY, FAX...) modem using serial audio for TX
• Headphone driving circuit for soundcards
• Hi-Fi PC Speaker System
• Homebuilt RS232 LCD Interface
• Homemade Serial to Nokia MBus Interface on a PCB, without using Zener diodes
• How to construct Garmin GPS receiver interface cables
• How to get power from PC to your circuits
• I2C printer port adaptor
• i2c-tiny-usb, a simple i2c interface for the usb port
• iLINK Interface
• Interfacing 16x2 character :LCD to parallel port
• Interfacing PC sound card to SSB rig
• iRDA interface for motherboard using Vishay TFDS4500
• Isolated Full Duplex RS232C Interface
• Jasmin floppy disk controller schematics
• Laptop Computer Serial Port Power Booster
• LCD2LPT with LIRC (LCD to LPT printer port) interface
• LCD2USB, cheap open source text LCD interface
• Linux Infra-red Remote Control (LIRC)
• Mac Serial Port (RS-422 DIN-8) to RS-232 DB-25
• Mac to HP48 cable pinout
• Machine Independent Parallel Interface
• MIDI cable for Sound Blaster cards
• More accurate PC/AT clock
• MS-DOS EEPROM Programmer
• New and Improved Sound Card Packet Interface tested with PSK31 and APRS
• Null Printer Adapter
• Parallel (Printer) Port Interface
• PC based digital thermometer based around a Dallas Semiconductor DS1621
• PC based Frequency Meter
• PC based thermometer based on Dallas DS1621
• PC electrically isolated RS422 interface using SN75176B or MAX485
• PC electrically isolated RS485 interface using MAX487 or SN75176B
• PC interface for point controller
• PC ISA board containing a Z80 microprocessor (coprocessor card)
• PC ISA Card Random Number Generator
• PC parallel port eight DC power switch cam driver two unipolar stepper motors, lights etc
• PC speaker volume control circuit
• PC thermometer using PC game (joystick) port
• PC-based ISA data acquisition and control board
• PG31 GPS RS232 GPS development board
• PG31 GPS RS232 USB development board
• Pic-Plot GPIB to RS-232 converter
• Pic-Plot2 GPIB to USB converter
• PTT and soundcard interface for the TM255/455
• PTT and/or soundcard interface
• Radio clock for PC's
• Relay interface add-on board for PC
• RFID evaluation kit for PC serial port (PDF)
• RS232 - Lowe HF-225 interface
• RS232 DB-9 switch to flip between two serial ports
• RS-232 line monitor and loopback cables
• RS-232 Protocol Analyser
• RS232 RS485 USB Converter Board
• RS232 serial to USB converter cable circuit schematic
• RS-232 surge protection
• RS-232 to TTL cable
• RS232C Level Converter
• Sanyo 20EZ monitor circuit diagram
• SB-Bus Drivers Introduction and Circuit Diagrams
• Schematic of a standard PC joystick
• Sega 3D glasses interface circuit diagrams
• Serial port temperature datalogger
• Serial servo controller for interfacing hobby servos via RS232 to a PC
• Serial to parallel converter - connect a large number of digital outputs to a PC parallel port
• Short circuit protected power supply from PC 12V supply
• Simple Hankel USB oscilloscope for a PC
• Simple music synthesizer for an ATARI
• Simple Parallel (Printer) Port Interface
• Simple PC SmartCard reader
• Simple PC thermometer for serial port but using R/C network for measurement
• Simple RS-232 serial port buffer circuit
• Simple stepper motor driver for PC parallel port
• Small circuit and PCB layout for recording to PC Sound Monitor / Pre-amp
• SmartCard PC Emulator
• Sound Blaster Microphone Preamplifier
• Stepper motor controller for PC parallel port
• SWTP PR-40 Printer Interface Schematics
• The Great Z80 Computer Project
• The KD2BD Pacsat Modem
• Thermal fan control circuit designed for overclocked PCs
• TiltStick, a motion sensing device (USB interface to accelerometer)
• TM-441 9600bps packet modification
• Transceiver to PC interface with a hardware DTMF detector and galvanic isolation (PDF)
• Transceiver to PC soundblaster interface for digital operating modes (PSK-31, RTTY, SSTV etc)
• USB camera circuit
• USB LCD/VFD Controller Hardware
• USB to parallel port converter using Cypress CY7C68013A-56PVXC
• Using a PC power supply as a benchtop power supply
• Using the joystick port as general purpose input
• Various sound card interfacing circuit diagrams
• Yaesu FT-897 - PC interface (PDF)
• Yaesu VX-7 / VX-7R to PC interface
• Z80 Computer

MUSICPLAYER INTERFACING schematics

• 1.5V iPod Microphone (PDF)
• Aladin interface
• Apple iPod and iPhone dock pinout
• Casio calculator interface schematic
• Casio datalogger
• Design and build your own iPod docking station
• DIY iPhone 3G Charger circuit
• DIY iPhone Charger circuit
• DIY Microphone Cable for iPod Touch (2nd Gen)
• Fitting a JTAG interface to an iPAQ 3600
• Gameboy MIDI interface circuit schematic and notes on Linux development for Gameboy
• Interfacing ADXL202 accelerometer to PalmPilot
• iPod / USB MP3 charger using MC34063 switchmode regulator
• Mass storage and printer interface for the FX-700P calculator
• Palm Keyboard interface board
• Palm PDA based datalogger
• Palm Pilot, Palm III, V, VII, VIIx, Handera interface port pinout
• PalmPilot turbo boost guage interface
• Portable iPod charger
• Serial interface adapter for iPod Linux
• SHARP palm-top/hand-held to RS232 serial converter
• SHARP palm-top/hand-held to RS232 serial converter
• TomTom One V3 connector pinout
• USB charger for iPod using 7805 linear regulator
• Wireless local network for PalmPilot (large PDF)

Motor Controller circuits

• 12 Volt Differential Temperature Controller
• 35KHz Magnetic-Radiation Remote-Control
• 4 Digit Keypad Switch
• 4-bit receiver for DC motor control
• 555 Based Simple Servo Controller
• 556 Timer Stall-Motor Switch Machine Drivers
• 5A H-bridge motor driver based on TIP122 / TIP127 power transistors
• 6090 digital decoder schematics
• 9V Xenon photoflash controller (PDF)
• A Simple Repeater Fan Controller (PDF)
• AC Motor Speed Controller
• AC switching with TRIAC from TTL
• Assorted relay control circuits
• Audio Signal Detecting Auto Power-On Unit
• Bipolar stepper motor driver based on 74194 chip
• Bridge head
• Brushless DC electric motor control by CPLD
• Charge coupled bi-directional power MOSFET relay (PDF)
• Clap activated remote control
• CMOS control voltage for firing Crydom Soft-Start Motor Module
• CO2 controller for planted tanks
• Constant Temperature Circuit
• Constant Temperature Circuit
• Control 120VAC relay with TTL
• Current loop interface
• Dark activated switch
• DAS1 - 12 Volt 10 Amp Dark Activated Switch
• DC Motor Control Circuit
• DC Motor Controller using 74 series chips
• DC Motor Driver with L6203
• DC Motor Reversing Circuit
• DC Motor-Driver H-Bridge Circuit
• DC Push Button Motor Control Circuit
• Delayed Power Circuit using an SCR
• Digital logic controller
• DIY Power Pulse Controller
• Driving a relay with a CPU
• DS1821 programmable thermostat
• Dual Stepping motor drivers using UDN2540
• Electric heater thermostat
• Electronic circuit diagram of cell phone SMS remote control device
• Electronic Control for DC Motors Using Discrete Bridge Circuits (PDF)
• Fan control based on a TL082 opamp and IRF510 power MOSFET
• FAN Thermostat controlled by IR remote controller
• Finger touch activated switch (PDF)
• GSM SMS javljalnik ALSMS-01 (page in slovenian )SMS remote control project
• H Bridge controller for DC motors
• H Bridge Motor Control Circuits
• H-Bridge Circuit
• H-Bridge Motor Driver Using Bipolar Transistors
• Heating System Thermostat
• High And Low Voltage Cut Off With Time Delay
• High and Low Voltage Cutout with delay and Music
• High current PWM controller based around a 555 timer
• HIGH or LOW Power Switch For Lights or Small Motors
• Home Automation Over Internet
• Homemade Water Drain Pump controller
• Hot Water Tank Level Indicator
• How to Make a PWM Circuit without a Microcontroller
• LDR light/dark activated relay switch
• Light / dark activated relay
• Light detector
• Light Operated Switch
• Light switch using LDR
• Light/dark detector
• Light/Dark Detector drives a relay
• Line-powered Xenon flash transmitter (PDF)
• Machine vibration triggers hour meter (PDF)
• Mains Power Load Sensing Automatic Switch
• Micro-step driver - connect a bipolar steppe motor to a PC through the parallel port
• Microstepping with PBM3960 and TEA3718
• Modular relay system
• MOSFET based speed controller uses 9 IRFZ40 power MOSFETS
• MOSFET H-BRIDGE schematic and theory
• Motor speed controllers
• MotorDriver V1.0 - Dual DC Motor Driver Board (LMD18200T based, 55V 3A, 6A peak) - PDF
• No-Hum Fan Controller
• NPN transistor circuit for relay control (relay driver)
• One component stepper motor driver
• Optically isolated stepper motor controller
• Optically isolated TRIAC driver
• Over / Under Voltage Cut-Out
• PA fan temperature controlled speed motor speed controller
• Pulse width modudulator using 555 timer IC
• Pulse Width Modulation DC Motor Control
• Pulse Width Modulation DC Motor Controller
• Push Button Motor Control Circuits
• Pushbutton one-shot and latch (PDF)
• PWM DC motor control with SG3525
• PWM DC Motor Speed Control
• PWM motor controller
• PWM Motor Speed Controller / DC Light Dimmer
• PWM Motor Speed Controller / DC Light Dimmer
• PWM Motor/Light Controller circuit diagrams
• Radio Remote Control using DTMF
• Relatively simple thermostat circuit diagram
• Relay circuit for relay control via an RS232 port
• Relay circuit using 74LS573 to driver 5V DC relays
• Relay controller based on Microchip PIC16F84 (PDF)
• Remote Motor Controller
• Rolling code 4-channel UHF remote control
• Safe Universal Mains Switching Box
• Selection of PWM driver circuits for electric DC motors
• Serial servo controller
• Several stepper motorol control circuits
• Shadow activated (or hand wave) motion detector
• Simple 120 VAC motor speed controller based on a TRIAC
• Simple keypad operated switch
• Simple Servo Controller using 555 Timer
• Simple temperature regulated FAN speed controller
• Simple Two Speed Contactor DC Motor Controller
• Smart switch, short press for on, longer press to turn off
• Solenoid starter
• Solid state relay (PDF)
• Solid-state power controller
• Sound operated switch
• Stepper motor controller
• Stepper motor controller
• Stepper Motor Controller using 4027 flip-flop and 4070 XOR gate
• Stepper Motor Driver using L298 and L297
• Stepper motor driver using PIC12F675
• Stepper motor driver using PIC12F675 that offers serial port command interface
• Stepper Motor Driver using TEA3718/3717
• Stepper motor positioner
• Switching solenoid driver
• Temperature monitor using 741 opamp
• Thermal cooling fan controller
• Thermo-Fan to keep your amplifier or other equipment cool
• Three electronic circuit diagrams for thermal controllers including linear and PWM control
• Time Delay Relay
• Time Delay Relay II
• Touch switch
• Touch switch based on CD4011 flip-flop
• Touch Switch using 4011 CMOS NAND Gate IC
• Touch Switches
• Unipolar stepper motor driver based on 74194 chip
• Variety of simple motor control circuit diagrams using SCR or TRIAC
• Voice activated switch using MC2830
• Voltage comparator switch
• Water Detector With Sump/Bilge Pump Controller
• Water system controller (PDF)
• Wireless RF PWM dual motor controller

Audio circuits

• 100W Guitar Amplifier Mk II
• 2 Note Ribbon Controller
• 25-pin PC serial port to MIDI synthesizer interface cable
• 3 Channel Color Organ
• 8 Note Tune Player
• 8 note tune player
• 9-pin PC serial port to MIDI synthesizer interface cable
• A refined Fuzz Face. Schematic and PCB layout.
• Amiga MIDI interface
• Ampeg SB-12 Portaflex adapted for use as a bass overdrive stompbox
• An ultra-flexible tonestack with clean boost. Schematic, photo, and PCB/perfboard layouts.
• Apple Mac to MIDI synthesizer interface cable
• Apple Macintosh MIDI interface schematic (basic version)
• Apple Macintosh MIDI interface schematic (deluxe version)
• B. Blender: Blends an effects chain with the input signal. Works well with bass guitar
• Bassline synthesizer/sequencer
• Big Muff Pi variant using Bazz Fuss as clipping stage. Schematic and and PCB/perfboard layouts.
• Boogie MkI adapted for use as a distortion stompbox
• CD4049 based distortion. Schematic, PCB/perfboard layout, and photos.
• Closer look at the FET booster based on a vintage Fender 12AX7 input stage.
• Colour (Sound) Organ
• Colour (Sound) Organ
• Compact DJ station
• Daisy MP3 player project
• Digital Guitar Tuner
• Distortion effects using an LM386 audio amplifier IC
• DIY Serial MIDI Interface (80C51/80C31 Version)
• Drawdio - A very simple musical synthesizer that uses the conductive properties of pencil graphite
• Drum percussion sensor schematics
• Drum Tone Oscillators
• Dual parallel buffered effect loops with blend control. Schematic and perfboard/PCB layouts
• Electronic metronome
• Faux-phaser circuit with LFO and manual (wah pedal) modes. Schematic and and PCB layout.
• Fender Princeton adapted for use as a distortion stompbox
• FET overdrive developed as a Tube Screamer alternative. Schematic and perfboard layout.
• Guitar Fuzz Effect
• Guitar fuzz effect
• Guitar Reverb Effect Version 2
• Guitar Reverb Pedal
• Guitar Reverb Pedal
• Guitar Tremolo Unit
• Guitar Vibrato Unit
• Homebuilt MP3 Player
• Improved Silicon Fuzz Face. Schematic, build notes, photo, and PCB/perfboard layouts.
• Infinite melody for music synthesizers
• Liquidator Tube Phaser/Chorus Effect
• Lossless portable digital audio player using the Microchip PIC32
• Marshall 100W Super Lead adapted for use as a distortion stompbox. Schematic and PCB layout.
• Marshall 18W adapted for use as a distortion stompbox
• Matchless DC/30 adapted for use as a distortion stompbox
• Metronome Circuit
• Microcontroller MIDI interface
• MIDI Controller Footpedal
• MIDI Drum Machine Analog Input Schematic
• MIDI drum machine project
• MIDI interface / cable tester
• MIDI keyboard circuit diagram
• MIDI merger schematic
• MIDI Pedalboard Encoder
• midi2cv8 to Drum Tone Board Connections
• Midibox 64
• Miniature metronome
• MP3 Player circuit schematic
• Mr Smooth is a clean boost to mild overdrive effect
• Mr. EQ - a simple, yet potent DIY equalizer
• Music player built on microcontroller AT91SAM7S256 with ARM core
• Musical Instrument (Expandable) Graphic Equaliser
• New clipper circuit diagram (based on TL071 opamp)
• Octave screamer
• Peppermill overdrive - A simple, transparent overdrive. Schematic and PCB/perfboard layouts.
• Percussion generator circuits
• Portable Mixer with high-quality modular design (9V battery powered)
• Portable MP3 music player
• Practical MS Decoder Circuit
• Real-world MIDI interface platform project including circuit diagram and PCB design files
• Schematic of a Rockman-like distortion. Schematic and PCB/perfboard layouts.
• Selection of solid state and tube guitar amplifier and effects circuits
• Serial MIDI interface
• Simple Colour Organ
• Simple colour organ
• Simple line mixer
• Simple metronome using LM1458
• Simple MIDI switcher
• Simple MIDI tester
• Simple open source MP3 player with SD/MMC memory card support
• Simple Transistor Organ
• Sound Effects Generator
• Sound Effects Generator 2
• Sound Lab Mini-Synth analog music synthesizer
• Spring reverb
• Spring reverb unit
• Spring Reverb Unit For Guitar
• Standard MIDI to MIDI interface cable diagram
• Supro 16T adapted for use as a distortion stompbox
• The 203 Theremin - A Battery-Operated Version of the Wien-Bridge Theremin
• Theremax Theramic Circuit Schematic
• Theremin
• Theremin controller
• Tone Filters for Electronic Organs (PDF)
• Transistor organ
• Treble Booster/Overdrive including a perf board circuit layout
• Tube Screamer-based overdrive. Schematic and PCB/perfboard layouts.
• Two channel distortion circuit
• Ultra Simple Bass Guitar Compressor
• Umble - A distortion stompbox, inspired by Dumble amplifiers. Schematic and PCB/perfboard layouts.
• Using the Hot Springs Reverb reverberation unit
• Versatile FET booster engine. Schematic and perfboard/PCB layouts.
• Vocal zapper
• Vox AC-30 Top Boost adapted for use as a distortion stompbox
• Wave Multiplier for music synthesizers
• Zonk Machine and Treble Booster

Electronics study & Lab projects

• 10 GHz CW Radar based on a X-band Gunnplexer
• 12 Volt Toilet Tank Refiller
• 1uS light pulse descriminator plus F to V converter (PDF)
• 1uS light pulse receiver plus post amp (MISC)
• 2D3 Nixie clock schematic using Atmel microcontroller
• 6 Pole ElectroMagnet Motor (aka Simple Brushless motor)
• 741 Light Sensor
• A small collection of quick to build electronic circuit designs
• A Two-Way Morse Practice Set
• Air flow detector
• Air flow detector using an incandescent lamp to detect airflow
• Amateur weather station to APRS interface ALWXI-01
• Analog computer
• Analog opto-isolator
• Analog pulse counter
• APRS system for GPS tracking
• Assorted digital circuits
• Aurora Alarm: Automated Detection System for the Northern Lights
• Barry's Coilgun Mark I circuit diagrams
• Barry's Coilgun Mark II circuit diagrans
• Barry's Coilgun Mark III circuit diagrans
• Barry's Coilgun Mark IV circuit diagrans
• Barry's magnetic levitation project
• Basement doorbell beeper (PDF)
• Basic Homebuilt Discrete DTL gate circuits (Diode Transistor Logic)
• Basic opamp circuits
• Bat detector
• BayComm packet modem
• Beat Balance Metal Detector
• Biasing Op-Amps into Class A
• Big Ear Stereo Parabolic Microphone
• Black Light
• Bleeper box for time reference
• Broadband 2MHz optical fiber receiver (PDF)
• Broadband 5MHz optical fiber receiver (PDF)
• Build logic gates using discrete parts
• Build your own UFO Bino-Scope unit - upgrade binoculars to become a photosensitive bino-scope
• Build Your Own Video-Rate 2-photon Microscope
• Building a Hardware Random Bit Generator
• Capacitance to Voltage conversion
• Capacitive Sensor
• Cat or Dog Detector - can be used to control entry on a Cat or Dog Door
• Chaos generator
• Circuit diagram for Coilgun Pistol Pskov 1100
• Circuit diagrams for making logic gates from discrete components
• Circuit for driving a liquid crystal (LCD) shutter to simply pass or block light
• Circuit for gold wafer card
• Circuit for temperature stabilization of a MTP3055E MOSFET
• CMOS based electric fence design
• CMOS Logic Experiments
• Coil Coupled Operation Metal Detector
• Color sensor circuit
• Computerize Your Room/Home
• Count Accumulator for Radiation Levels (CARL)
• CW Tone Keyer
• Dekatron circuit diagram - device used for dividing by 10 during the valve era
• Delayed shutter control for Kodak DC-20
• Digg Button Kit
• Digital Call Sign Annunciator
• Digital Radar Speedometer
• Digital Remote Thermometer
• Dinsmore 1490 digital compass
• DIY 3-axis CNC milling device
• DIY Plasma Globe using an automotive ignition coil
• DIY Tesla coil - DC Powered with Plasma Output
• Doorbell for the Deaf
• Driving N-channel FETs from TTL
• Easy Morse Code Keyer Circuit
• Electric field disturbance monitor
• Electromagnetic field detector
• Electromagnetic Field Probe with Meter Output using an LF351 opamp
• Electronic canary doorbell
• Electronic dazer
• Electronic inclinometer ("clino"), a surveying device
• Fantastic Atom Expander
• FCTS Project
• FET based metal detector using MPF102 / J310 BF998 FETs
• Fish caller circuit
• Fluid level detector
• FM Morse Code Keyer
• Fogger smoke machine controller
• Full-duplex doorphone with 3 wires connection
• G Strain energy absorber
• Garmin Foretrex 101,201, Forerunner 101,201 to Serial DB9 cable schematic pinout
• Garmin GPS data interconnect
• Geiger counter
• Geomagnetic field detector
• GoldPic 3 Pulse Induction Metal Detector (has electronic kit available)
• GPS receiver support kit
• Hacking the Hot Wheels Radar Gun - includes circuit of analog front end
• High Quality Intercom
• High Speed ISO9141 Interface using Motorola MC33290D ISO driver IC
• High voltage stun gun
• High voltage zappers
• High-speed 75MHz light receiver (PDF)
• Home-Built Magnetic Levitator
• How to Make a Roomba Serial Interface
• Hydrogen Generator, PWM Circuit
• Induced voltage sensor delta-peak trigger for coilgun
• Induction receiver for tracing wiring behind walls, hearing lightning and other electric discharges
• Inexpensive APRS Weather Station
• Inexpensive seismometer project
• Insect Repellant
• Insect Repellant (22KHz audio oscillator)
• Intercom schematic
• Interesesting circuits using diodes ideal for education or introductory courses on electronics
• Ion detector
• Jacob's Ladder
• Jacob's Ladder
• Kenwood TH-D7 NMEA GPS bug fix
• Laboratory Control System for Cold Atom Experiments
• Lazer Tag Equipment Modifications
• Lie detector
• Light Activated Detector Circuit (LM393/LM555)
• Lightning Detector
• Lightning detector circuit diagram
• LNS Technologies Levitator Kit circuit diagram
• Lost keys finder using HCF4069
• Low Voltage Alarm
• Low-power optical interrupter (PDF)
• Magnetic Gun.
• Magnetic levitation device
• Magnetic levitation project from Electronics Now, February 1996
• Magnetic levitation project from Popular Electronics, May 1966
• Magnetic levitation project from Popular Electronics, May 1989
• Mains Remote-Alert - Remotely operates beeper and/or a LED via mains supply line
• Metal detector Mk1 - find hidden treasure at the beach
• Metal detector Mk2 - More sophisticated 5 transistor metal detector (BC547, BC557, BC338)
• Mini efficient magnetic coil launcher from disposable camera flash
• Miniature magnetic gun (rail gun)
• Miscellaneous 741 opamp schematics
• Miscellaneous Circuits for Idea Purposes
• Miscellaneous simple circuits
• Mobile APRS / GPS tracking system
• Modifications for CDV700 Geiger Counter
• Modulated light receiver circuit (PDF)
• Monitor output from Motorola Oncore GPS engine in HP Z3801A in GPS Disciplined Oscillator
• Morse Code Beacon Keyer
• Morse code display
• Morse Code Practice Keyer 1
• Morse Code Practice Keyer 2
• Morse monitor
• Morse paddle keyer
• Navigator 555A radio direction finder (RDF) circuit diagram
• Negative Ion Detector
• Negative Ion Generator
• Nocturnal Animals Whisker
• Nokia 3310 Lcd Thermometer using DS18B20
• omentary High Voltage Arc Circuit - can be used to Ignite a barbeque or a Gas in a Potato Gun
• Op-amp circuits for detectors, filtering, and power applications including photodiodes (PDF)
• Open loop pulse trigger module for coilgun
• Optical speed trap to measure the the velocity of the projectile
• Optical trigger module for coilgun
• PASCO scientific model SF-9211 stroboscope schematic (PDF)
• Photo sensor application note showing photodiode and phototransistor circuits
• Photodiode primer and interface circuit diagrams including photovoltaic and photoconductive modes
• Plant Watering Watcher (moisture meter)
• Popular Electronics Ultrasound Detector
• Power MOSFET module for coilgun
• Powerful stun gun / taser circuit diagram
• Project for experimenting with magnetic levitation
• Pulse width modulators (PWM)
• Pulse width to voltage converter
• Rain Detector
• Random noise generator
• Scaling ADXL50 accelerometer output
• Seismic detector interfaces to datalogger
• Select of interesting electronic circuits that require only a single transistor ideal for education
• Selection of run circuits to experiment with the 4017 CMOS decade counter chip
• SIM card reader circuit diagram
• Simple BFO metal detector using 2N3906 and 2N3904 transistors
• Simple DTMF Repeater Controller using PIC16F84
• Simple electronic keyer
• Simple Frequency Reader for conversion VFOs
• Simple Lie Detector
• Simple metal detector circuit using BC547
• Simple moisture indicator
• Simple nitrogen spark generator (PDF)
• Single chip metal detecor with a range of a few inches based on CS209A
• Small selection of useful circuits
• Solid state tesla coil
• Solid State Tesla Coil and Wireless Power
• Sony RS-422 ADAT sync cable pinout
• Sound finding cricket
• Sound finding cricket with phase detector
• Spy circuits
• Static Electricity / Negative Ion Detector
• Stroboscope
• Stun gun / taser circuit diagrams
• Suddent ionospheric disturbance (SID) receiver
• Switch debouncer circuits including transistor, CMOS logic and a 555 timer based design
• Tesla coil
• Tesla coil
• Tesla power receiver
• Texas Instruments collection of buffer op-amp circuits for ADC
• Texas Instruments collection of differential op-amp circuits (PDF)
• Three stage induced voltage triggered coilgun
• Thyristor fired coilgun circuit diagram
• Time to dust indicator - battery powered dust indicator (PDF)
• Touch activated switch using CD4011 CMOS NAND gate
• Touch switch using transistors
• Touch switches
• Transresistance photodiode amplifier that behaves as a current-to-voltage converter
• Two-component metal detector using a 4093
• Two-tone doorbell using 555 timer
• u-Blox GPS receiver board
• Ultra Low Power LCD Indicator
• Ultrasonic dog whistle
• Ultrasonic Pest Repeller
• UltraSonic Radar
• Ultrasonic sonar unit using MAX232 to drive ultrasonic transducer
• Ultrasonic sound detector / sniffer
• Ultrasonic switch
• Ultrasonic transducer oscillator circuit
• Ultrasound detector
• UV light box
• Vareity of circuits for interfacing to/from TTL logic
• Variety of applications using a CMOS 4001 2-input NOR gate including a PCB layout
• Very basic circuits
• Visible and Infrared Light Detectors
• Voice activated switch (VOX) circuit diagram
• Voltage Comparator Information And Circuits
• Waveform conversion
• Weather station with pressure reading, relative humidity, indoor & remote temperature reading

Remote controller circuits,toys,robots,RC controlled gadgets

• 0-10V control for RC servos
• 27Mhz toy car receiver
• 27Mhz toy car transmitter
• 5 Second Ramp Generator for Locomotive Sound Card Demonstration
• 5 Times Around Circuit
• 556 Timer Stall-Motor Switch Machine Drivers
• A dual alternating flashing light circuit
• A dual tandem flashing light circuit powered by a 9 volt battery
• A Receive Signal Decoder
• A selection of robotics projects
• Acceleration Sensing - gesture controllers for robotic musical instruments
• Across The Track Infrared Detectors
• Adding External Meters to DC Throttles
• Analog controller for TekBot robot
• Angelfire rocket GPS payload
• Audible Train Approach Warning Circuit
• Automatic - Railway Grade Crossing Circuit (2008 design)
• Automatic Railway Grade Crossing Flashers
• autopilot: Do it yourself UAV
• AVR Line Following Robot
• Balancing robot (PDF)
• Basic DC controller for model trains (PDF)
• Bi-Ped Project 2
• Bi-Ped robot project
• Block Occupancy Detector For DCC
• Build A Roomba Bluetooth Adapter
• Building a robot arn using Nitino muscle wire
• Building an RF Remote Control System
• Charger board for TekBot robot
• Circuit diagram for connecting the SRF08/10/235 sonar modules to the BS2p Basic Stamp
• Circuit for three axis robot arm based on stepper motors out of 5 1/4" drives
• Collection of BEAM robot circuits
• Connecting Multiple SRF08 Sonar Modules to a BS2 (Basic Stamp 2)
• DCC - Zero Stretching Simulator (LM555)
• DCC Circuit Breakers
• DCC To DC - Accessory Power Supplies
• Deriving power from Lego NXT motor port A
• Discharger for Receiver Battery Packs
• Distance Sensing - devices for wireless distance and position determination
• Doppler radar based gesture measurement system capable of delivering positional information
• Downed model locator
• Downed model locator Mark 2
• Electronic millipede robot
• External power supply for Lego NXT
• First Across The Line Race Scorer Circuits
• Glowplug driver for radio control models
• GP2D12 distance sensor
• Grade Crossing Bell Ringer (LM555)
• Grouped DCC Block Occupancy Detectors
• Incline Railway Control Circuit
• Launch controller for multiple rockets
• LED Out Circuit For Tortoise Switch Machines
• Lego compatible, compact rotation sensor
• Level crossing for model railways
• Locomotive signal braking module
• Making a FRED photopopper
• Miniature bipedal robot that starts to walk when you clap your hands
• Miniature line follower robot
• Model Railroad - Infrared Proximity Switch
• Model Railroad Odometer Car
• Model rocket launch controller
• Model Train Diesel & Horn Sound Module
• Moderately complex train detector using an infrared LED and an infrared detector
• Motor controller board for TekBot robot
• Motor walker circuit
• Multi Rocket Launcher
• Pad launch controller for model rockets
• PC Controlled RC Car
• PIC-Bot II using Microchip PIC16LF84
• Precision Receiver Battery Low Voltage Alarm
• Proportional radio remote control
• R/C digital camera controller
• R/C Emergency locator alarm
• R/C helicopter camera
• Rail Crossing Diamond Protection Circuit
• RC Receiver Battery Low Voltage Alarm
• RC Receiver for airplane (35MHz)
• RC Servo Controller with preset
• RF Modem Robotics Project
• Robotic microcontroller board
• Roomba robotic vaccum cleaner serial interface
• School Bus Signals Circuit
• Signal braking module
• Signal module for model railways adds a high degree of realism
• Simple flashing light circuit
• Simple flashing light circuit
• Simple flashing light circuit
• Simple throttle control ideal for railway shuting yards or a second main track line
• Simple Traffic Light Controller
• Simple train detector using ambient light and a photocell
• Simplest R/C circuit
• Simulate the Gyralite (dual flashing headlights).
• Slot car TV cronograph displays the lap times of your model cars on a regular TV
• Snuf simple autonomous mobile robot
• Sonar and PIR Sensor Board for TekBot / general robotics
• Tactile whisker for TekBot robot
• The Coat Hanger Walker - Simple BEAM robot
• Three Terminal Regulator Type Throttle (LM350K)
• Timed DC Throttle
• Timed Uncoupling Ramp Driver (LM555)
• Traffic light controller with 20-output sequencing
• Train Mounted Camera Battery Charger
• Trooper - miniaturized Scout Walker 2 robot
• Turnout Anti-Derail Protection Circuits
• Two tone train horn
• Various radio control schematics
• Various Transistor Throttles Cicuit Schematics
• Walking robot
• Walking robot (PDF)
• Wire guidance sensor

Microcontroller projects - (collection Dedicated to Embedded aspirers)

• "Singing" Christmas tree based on Microchip PIC16F84
• (E)EProm, PIC and GAL Programmer
• 10 tricks for interfacing to the PIC16C508
• 10 tricks for interfacing to the PIC16C508
• 101 AT Keyboard to ASCII Decoder using 68HC705J1A MCU
• 128x64 LCD Driver for AT90S2313 (ZIP file)
• 2-wire LCD interface using PIC16CF84
• 3-wire serial LCD interface for the PIC
• 40+ MHz 5-digit frequency counter with an AVR 2313
• 4-Channel Timer using Atmel 89C4051 and MAX7219 display driver
• 50 MHz frequency counter, voltage meter & SWR/PWR indicator
• 6802 Nano computer
• 8049 Spy - read the internal ROM contents of a 8048 or 8049 processor
• 8051 Development System Circuit Board
• 8051 Development System Circuit Board
• 8051 Development System Circuit Board
• 8051 Development System Circuit Board
• 8051 SBC (single board computer)
• 8051SBC V1.1
• 8088 maximum mode SBC
• 80C31 stepper motor controller
• 89C2051 microcontroller programmer
• 89S52 Project Board
• 90S2313 AVR Robot Board
• A Real Time Clock IC (DS1307) project using the PIC micro
• A Scenix (and PIC) Programmer
• Acceleration monitor using ADXL202 and AVR
• ADC conversion using ADC0804LCN and 8051
• AFSK 1200 Modem based on PIC16C620
• 'Almost No Parts' 7-segments 12/24 Hours LED clock with PIC 16F84A or 16F628A
• Analog datalogger based on T89C51RD2
• Analog to digital (ADC) conversion notes
• Arduino based controller interface for servo motors, stepper motors and DC motors
• Arduino microcontroller prototyping system
• Asynchronous 40-bit TTL CPU
• AT89C2051 Digital thermometer and clock
• AT89C2051 line-follower robot
• AT89C2051 Night light saver
• AT89C2051 real-time controller
• AT89C2051 serial COMs to LED driver
• AT89C2051/4051 Driving dot LED
• AT89C2051/4051 Easy-Downloader
• AT89C2051/4051connecting dumb terminal
• AT89C2051/4051scanning 7-segment display and keypad
• AT89C2051/4051stepper motor interface
• AT89C51/52/55 Easy-Downloader
• AT89Sxx Cheap and Simple Learning Board
• AT90S8515 experimenter board
• ATmega48 based Nixie Clock
• ATmega8 based TNC with GPS and WX support
• Atmel 8051 Flash Based-Microcontroller Programmer
• Atmel 89 Series Device Programmer
• Atmel 89C Series Flash Microcontroller Programmer
• Atmel 89C2051 In-Circuit Programmer Schematic
• Atmel 89C2051 prototype board
• Atmel 90s2313 based TNC
• Atmel AT90USB development board
• Atmel ATmega128 development board
• Atmel ATtiny26 development board
• Atmel AVR 90s2313 based POCSAG encoder (ZIP file)
• Atmel AVR and 8051 series ISP programmer
• Atmel Mega88 Dual Temperatur meter
• Atmel Mega88 Temperatur meter, Type K sensor, Heat set and regulator
• Atmel Microcontroller based Ultrasonic Ranger
• Automatic door opener with PIC12C508
• AVR STK200/STK300 ISP Dongle circuit diagram
• AVR Thermometer
• AVR-Based Serial Port IR Receiver
• AVR-Core V1.1 - DIP-like development board for ATmega128 processors (PDF)
• AVRlinx V1.1 - Development board for ATmega16, ATmega32 processors with data radio transceiver (PDF)
• AVRmini V2.0 - Development board for all AVR processors in 40-pin packages (PDF)
• AVRmini V3.1 - Development board supporting all AVR processors in 40-pin and 64-pin packages (PDF)
• AVRmini V4.0 - Development board with Ethernet/USB for 40-pin AVR processors (PDF)
• AVRmini8 V1.0 - Development board for ATmega8, ATmega44, ATmega88, ATmega168 processors (PDF)
• Basic Stamp based altimeter
• Build a PIC controlled DDS VFO, 0 to 6 MHz
• C-52 EVB Robot Controller
• CASIO datalogger system based around Microchip PIC microcontroller
• CF/IDE Adapter V1.0 - CompactFlash and IDE interface for your microcontroller
• Cheap Ultrasonic Range Finder based on PIC16F877A with a 8MHz crystal
• Circuits for interfacing microcontrollers to a wide number of real-word interfaces
• Complete Design for Giant 8-foot LCD Counter (Zip file)
• Connecting AT90S2313 with LCD display 2x16 char and 4x4 keypad
• Connecting LED to PIC Micro I/O pins (PDF)
• Cypress PSoC based digital wallet to record secret codes and passwords securely
• Darkroom timer using PIC16F84A
• Designing a 4-Channel A/D (ADC) converter with the PIC12C671
• Digital compass using PIC16F84
• Driving high-power loads with a microprocessor
• DS1820 Arbiter V2.00 Schematic
• Electronic distance meter based on Motorola 68HC908QY4
• Electronic irrigation controller based on PIC
• Electronic safety lock based on ATtiny26
• Ethernet shield for Arduino (Xport)
• EZ80 single board computer schematic (Z80)
• Fan timer based on Motorola 68HC908QT2
• Galvanic decoupling of I2C bus
• GPS / Datalogging shield for Arduino microcontroller
• GPS LCD Display Project
• Hardware Random Number Generator with an SX microcontroller
• Homebrew Basic Stamp project
• I2C LCD interface
• IDE interface to a Microchip PIC16F877 microcontroller
• In-Circuit PIC Loader (ISP programmer) over parallel port
• Interfacing DRAM to AT90S8515
• Interfacing EEPROM to a Basic Stamp
• Interfacing the MAX186 8 Channel ADC to the BSII
• Interfacing the MAX187 ADC to the BSII to measure voltages
• Interfacing the PIC16C508
• Isolated RS232 for PIC16F84
• JDM programmer
• Jupiter card programemr
• KD7LMO Micro Beacon (PIC18F252)
• LCD clock based on AVR Attiny2313
• LCD thermometer using PIC16F871
• LCD to PIC16C54 schematic
• LED 5x7 display using a PIC microcontroller
• Linuxstamp general purpose processor module based on Atmel AT91RM9200
• Long-period watchdog timer
• Low cost Atmel in-system programmer
• Mains clock controller using AT89C2051
• Measuring Acceleration Using a PIC Microcontroller (ADXL202 + PIC16F84A)
• Microchip PIC ICD (in-circuit debugger)
• Microcontroller sensor and actuator interfaces
• Microprocessor RS-232 Reset
• Microprocessor using Xilinx FPGA
• MiniLOGGER V1.0
• MMC to PIC16F876 circuit diagram
• Motorola 68HC11 evaluation board
• Motorola 68K SBC (single board computer)
• MTK-85 8085 Microprocessor Training Kit
• Multi PIC Programmer 5 Ver.2
• Multi-chip programmer
• Multi-chip programmer for Microchip PIC microcontrollers
• Multi-chip programmer for PIC microcontrollers
• Multipurpose buffered PIC microcontroller development system
• Night light saver (PIC12C508)
• Nixie clock (PIC16F876)
• Parallel AVR programmer
• PC to microcontroller communications using power from the PC serial port
• PIC 18 programmer (PIC18F458, PIC18F452, PIC18C252, PIC16C745, PIC18F6620, PIC18F6720)
• PIC based packet radio encoder (PDF)
• PIC demo board
• PIC ICD
• PIC LCD and Keypad driver
• PIC Light Chaser using PIC16C84
• PIC micro LED projects
• PIC micro multiple servo motor interface
• PIC micro programmer
• PIC micro to ISA bus interface
• PIC microcontroller servo motor interface
• PIC Project #1 - RS232 to I2C Interface
• PIC serial communications tutorial, includes circuit diagram and PIC16F84 assembler code
• PIC Serial LCD project - An RS232 serial LCD interface using a standard HD44780 LCD
• PIC sonar (ultrasonic) range finding project with seven segment display using PIC micro
• PIC vacuum fluorescent display (VFD) interface
• PIC Web Server Schematic
• PIC12C508 Night-light saver
• PIC12C508 Phase Controller for 2kW heater (ZIP file)
• PIC12C509 Gym Timer (ZIP file)
• PIC12C509 logic gate replacement for nitrogen filler (ZIP file)
• PIC16 DemoKit3 with programmer and displays
• PIC16C505 IR / wireless remote control
• PIC16F628 controlled FLL (Frequency Locked Loop) VFO for HF (PDF)
• PIC16F84 Based Morse Code Reader
• PIC16F84 CW decoder (PDF)
• PIC16F84 debugging terminal
• PIC16F84 LED chaser
• PIC16F84 line following robot
• PIC16F84 miniature real-time controller
• PIC16F84 programmer
• PIC16F84 pulse monitor with date/time output (ZIP)
• PIC16F84 Serial I/O-expander with PicBasic
• PIC16F84 tone generator
• PIC16F84 tone generator (6-Bit)
• PIC16F84 tone generator with source code
• PIC16F84 TRIAC / IGBT brightness phase controller
• PIC16F876 Datalogger
• PIC16F877 Programmer And Development System
• PIC16F877 to IDE interface
• PIC18F2550 Project Board
• PICADC - a free, PIC based "intelligent" A/D converter
• PicCon - Hidden Radio Transmitter Controller
• PicoWeb V5.1 (AT90S8515) tiny web server
• PIC-Programmer 2
• PIC-Programmer 2 for PIC16C84 etc
• PIXpand - TI calculator to Playstation memory card interface
• POCSAG encoder/decoder (Zip file)
• Poor man's analog to digital converter (ADC) using a 2N222 transistor and a few passives (PDF)
• Programmer PIC16F84,12C50x and EEPROM 24Cxx
• PS/2 keyboard keystroke logger based on Atmel 89C2051
• RF remote control based on Basic Stamp
• Rotating Sprocket Wheel Generator (PIC16F84)
• RS232 interfaced DVM using a PIC12F675 including source code for CCS C Compiler
• RS-232 to TTL Translator
• RS485-like multi-drop bus with half duplex serial protocol
• ScanMate audio activated recorded
• Scriptable thermometer / thermometric controller based around a COP8-CCR9-PLC44 microcontroller
• Serial LCD controller using a PIC16F628
• Serial LCD Controller using Microchip PIC16F628
• Serial port I/O interface using AVR microcontroller
• Serial to parallel converter using the AT89C2051
• Serial-based PIC16F84 Programmer For Windows 95/98/NT/2000/ME/XP
• Ser-Key 10-Key Serial Keypad Encoder
• Several Atmel AVR programmer circuits
• Simple CW Keyer based on Atmel ATtiny 2313
• Simple QRSS callsign keyer based on an Atmega AVR programmed in C
• Simple RS232C Level Converter using Transistors
• Smart card programmer
• Solderless Breadboard Arduino Clone for Arduino prototyping
• Speech recognition using HM2007
• SPI Flash Microcontroller Programmer
• SPI2CF, a fast and efficient WLAN interface for the AVR
• T89V51CC01 Development board
• Tachometer Measures Very Low Frequencies (PIC16F872)
• Talking PIC - based on SP0256
• TekBots universal device programmer with USB interface
• Temperature controlled based on AT89CX051
• Temperature monitor/controller: AVR 2313 / DS1621
• Tiny 2313 Project Development Board
• Tiny Eprom Simulator
• Tony Nixons Pocket Programmer (PIC)
• Touch senstor based on Atmel AT90S2313
• TTL to RS232 adapter using 2N3906 / 2N3904 transistors
• Ultra low-cost programmer for AT90S family
• Ultrasonic Distance Measurement With the MSP430 (PDF)
• Ultrasonic Distance Measurer based on Freescale MC9RS08KA2 (PDF)
• USB and GLCD expansion board for 8051 SBC
• USBmini V1.0 - Generic USB Full-speed interface board (PDF)
• USBtinyISP - AVR programmer & SPI interface project
• Using an ADXL330 accelerometer with an AVR microcontroller
• Using the AT89C4051 as a RTC (real-time clock)
• Variety of circuits for RS232 to TTL Signal Conversion
• Variety of circuits for TTL to RS232 Signal Conversion
• Victoria TAFE programmer (based on AT89C2051)
• Wave (Audio) shield for Arduino microcontroller
• Wireless communications using a Basic Stamp and low-cost wireless data modules
• Wisp628 ISP Microchip PIC Programmer
• WLoader - PIC16F877 application loader / bootloader