There are 254 circuit schematics available. Last circuit added on Tuesday, 19 May 2015.

CircuitCategoryDate AddedOK?
RS-232 to TTL TranslatorMicrocontroller 
Serial port I/O interface using AVR microcontrollerMicrocontroller 
A Scenix (and PIC) ProgrammerMicrocontrollerJan 26, 2001
Smart card programmerMicrocontrollerFeb 21, 2005
Jupiter card programemrMicrocontrollerFeb 21, 2005
PIC16F628 controlled FLL (Frequency Locked Loop) VFO for HF (PDF)MicrocontrollerOct 05, 2009
AT89C2051/4051scanning 7-segment display and keypadMicrocontrollerJan 26, 2001
AT89C2051/4051 Driving dot LEDMicrocontrollerJan 26, 2001
AT89C2051/4051stepper motor interfaceMicrocontrollerJan 26, 2001
AT89C2051/4051connecting dumb terminalMicrocontrollerJan 26, 2001
Motorola 68K SBC (single board computer)MicrocontrollerJun 20, 2004
8051 SBC (single board computer)MicrocontrollerJun 20, 2004
8051SBC V1.1MicrocontrollerMar 25, 2009
Atmel 89 Series Device ProgrammerMicrocontrollerMar 25, 2009
89S52 Project BoardMicrocontrollerMar 25, 2009
Using the AT89C4051 as a RTC (real-time clock)MicrocontrollerMar 25, 2009
Simple RS232C Level Converter using TransistorsMicrocontrollerJan 26, 2001
AVR ThermometerMicrocontrollerMar 25, 2009
Motorola 68HC11 evaluation boardMicrocontrollerJun 20, 2004
C-52 EVB Robot ControllerMicrocontrollerJan 26, 2001
Mains clock controller using AT89C2051MicrocontrollerJan 26, 2001
AT89C2051 Night light saverMicrocontrollerJan 26, 2001
Atmel 8051 Flash Based-Microcontroller ProgrammerMicrocontrollerJan 26, 2001
SPI Flash Microcontroller ProgrammerMicrocontrollerMar 25, 2009
AT89Sxx Cheap and Simple Learning BoardMicrocontrollerMar 25, 2009
AT89C2051 Digital thermometer and clockMicrocontrollerJan 26, 2001
Tiny 2313 Project Development BoardMicrocontrollerMar 25, 2009
4-Channel Timer using Atmel 89C4051 and MAX7219 display driverMicrocontrollerJun 20, 2004
AT89C2051 serial COMs to LED driverMicrocontrollerApr 12, 2001
Serial to parallel converter using the AT89C2051MicrocontrollerJan 26, 2001
Simple CW Keyer based on Atmel ATtiny 2313Microcontroller 
AT89C2051/4051 Easy-DownloaderMicrocontrollerJan 26, 2001
AT89C51/52/55 Easy-DownloaderMicrocontrollerJan 26, 2001
PIC16F84 programmerMicrocontrollerJan 26, 2001
PIC16F84 miniature real-time controllerMicrocontrollerJan 26, 2001
Isolated RS232 for PIC16F84MicrocontrollerJan 26, 2001
PIC16F84 debugging terminalMicrocontrollerJan 26, 2001
MiniLOGGER V1.0MicrocontrollerJan 26, 2001
Analog datalogger based on T89C51RD2MicrocontrollerJun 20, 2004
MTK-85 8085 Microprocessor Training KitMicrocontrollerMar 25, 2009
Atmel 89C Series Flash Microcontroller ProgrammerMicrocontrollerJan 26, 2001
In-Circuit PIC Loader (ISP programmer) over parallel portMicrocontrollerMar 25, 2009
PIC18F2550 Project BoardMicrocontrollerMar 25, 2009
Atmel 89C2051 prototype boardMicrocontrollerJun 20, 2004
AT89C2051 real-time controllerMicrocontrollerJan 26, 2001
PIC12C508 Night-light saverMicrocontrollerJan 26, 2001
PIC16F84 CW decoder (PDF)MicrocontrollerJul 10, 2002
Atmel AVR ATtiny45 development boardMicrocontrollerJun 28, 2011
AVR thermometer / thermostat based on an Atmel ATtiny2313MicrocontrollerJun 28, 2011
ADC conversion using ADC0804LCN and 8051Microcontroller 
PIC16F84 line following robotMicrocontrollerJan 26, 2001
PIC16C505 IR / wireless remote controlMicrocontrollerMar 23, 2003
DIY 2^16 encoder based on PICMicrocontrollerApr 12, 2014
Automatic door opener with PIC12C508MicrocontrollerMar 01, 2001
3-wire serial LCD interface for the PICMicrocontroller 
RS485-like multi-drop bus with half duplex serial protocolMicrocontrollerMar 23, 2003
Singing Christmas tree based on Microchip PIC16F84MicrocontrollerOct 07, 2009
50 MHz frequency counter, voltage meter & SWR/PWR indicatorMicrocontrollerJul 12, 2001
Serial LCD Controller using Microchip PIC16F628Microcontroller 
Dirt cheap video using a PIC16F819 microcontrollerMicrocontrollerMay 16, 2010
Talking fish hack using a PIC16F819 microcontrollerMicrocontrollerMay 16, 2010
LCD clock based on AVR Attiny2313Microcontroller 
101 AT Keyboard to ASCII Decoder using 68HC705J1A MCUMicrocontrollerJan 26, 2001
PIXpand - TI calculator to Playstation memory card interfaceMicrocontrollerJul 12, 2001
PIC 18 programmer (PIC18F458, PIC18F452, PIC18C252, PIC16C745, PIC18F6620, PIC18F6720)MicrocontrollerJun 06, 2003
89C2051 microcontroller programmerMicrocontroller 
PIC sonar (ultrasonic) range finding project with seven segment display using PIC microMicrocontroller 
A Real Time Clock IC (DS1307) project using the PIC microMicrocontroller 
PIC Serial LCD project - An RS232 serial LCD interface using a standard HD44780 LCDMicrocontroller 
Connect a Serial LCD Display to Raspberry PiMicrocontrollerMar 23, 2015
MMC to PIC16F876 circuit diagramMicrocontrollerJun 18, 2003
Circuits for interfacing microcontrollers to a wide number of real-word interfacesMicrocontroller 
Hardware Random Number Generator with an SX microcontrollerMicrocontroller 
8088 maximum mode SBCMicrocontrollerNov 16, 2002
EZ80 single board computer schematic (Z80)MicrocontrollerApr 27, 2003
8051 Development System Circuit Board circuit diagramMicrocontrollerJun 20, 2004
Long-period watchdog timerMicrocontrollerJan 26, 2001
PIC Web Server SchematicMicrocontrollerSep 13, 2006
IR On/Off Switch Using a PIC12F629 MicrocontrollerMicrocontrollerNov 13, 2010
PIC ICDMicrocontrollerOct 23, 2002
Using an ADXL330 accelerometer with an AVR microcontrollerMicrocontrollerJan 09, 2010
Circuit and Arduino sketch for interfacing to a DS18B20 1-wire temperature sensorMicrocontrollerJul 21, 2013
Simple QRSS callsign keyer based on an Atmega AVR programmed in CMicrocontrollerNov 05, 2009
Asynchronous 40-bit TTL CPUMicrocontrollerAug 18, 2009
Victoria TAFE programmer (based on AT89C2051)MicrocontrollerJan 31, 2003
JDM programmer circuit diagramMicrocontrollerJan 31, 2003
PIC micro programmer circuit diagramMicrocontrollerJan 31, 2003
Speech recognition using HM2007MicrocontrollerNov 29, 2002
PIC microcontroller servo motor interfaceMicrocontrollerNov 29, 2002
PIC micro multiple servo motor interfaceMicrocontrollerNov 29, 2002
GPS LCD Display ProjectMicrocontrollerJul 24, 2002
PIC16F84 LED chaserMicrocontrollerNov 17, 2002
PIC micro LED projectsMicrocontrollerJun 18, 2003
PS/2 keyboard keystroke logger based on Atmel 89C2051MicrocontrollerJun 20, 2004
6502 Microprocessor KitMicrocontrollerMay 19, 2015
68k Single Board ComputerMicrocontrollerMay 19, 2015
AT89C4051based digital clock with 16x2 LCDMicrocontrollerMay 19, 2015
Digital Clock with Alarm Using DS1307MicrocontrollerMay 19, 2015
Realtime Clock with LCD based on an Atmel AT89C4051MicrocontrollerApr 22, 2014
Z80 Microprocessor KitMicrocontrollerMay 19, 2015
Solderless Breadboard Arduino Clone for Arduino prototypingMicrocontrollerOct 12, 2009
Ethernet shield for Arduino (Xport)MicrocontrollerOct 12, 2009
GPS / Datalogging shield for Arduino microcontrollerMicrocontrollerOct 12, 2009
Arduino based controller interface for servo motors, stepper motors and DC motorsMicrocontrollerOct 12, 2009
Arduino microcontroller prototyping systemMicrocontrollerOct 12, 2009
USBtinyISP - AVR programmer & SPI interface projectMicrocontrollerOct 12, 2009
Wave (Audio) shield for Arduino microcontrollerMicrocontrollerOct 12, 2009
PIC12C509 Gym Timer (ZIP file)MicrocontrollerMar 01, 2003
PIC LCD and Keypad driverMicrocontrollerOct 31, 2002
PIC12C508 Phase Controller for 2kW heater (ZIP file)MicrocontrollerMar 01, 2003
PIC16F84 TRIAC / IGBT brightness phase controllerMicrocontrollerMar 01, 2003
PIC16F84 pulse monitor with date/time output (ZIP)MicrocontrollerMar 01, 2003
PIC based touch clock that demonstrates interfacing a PIC microcontroller to an LCD touch panelMicrocontrollerJun 27, 2010
A PIC16F84A Alarm ClockMicrocontrollerJun 27, 2010
A Voice Controlled LED Light Show using a VRStampMicrocontrollerJun 27, 2010
Cheap Ultrasonic Range Finder based on a PIC microcontrollerMicrocontrollerJun 27, 2010
Cheap Ultrasonic Range Finder based on PIC16F877A with a 8MHz crystalMicrocontroller 
A PIC16F819 Dymoclock (also demonstrates interfacing 30 LEDs to a PIC using only six I/O pins)MicrocontrollerJun 27, 2010
EasyPic2 with on-board Ethernet AdapterMicrocontrollerJun 27, 2010
Linuxstamp general purpose processor module based on Atmel AT91RM9200Microcontroller 
PC to microcontroller communications using power from the PC serial portMicrocontroller 
8051 Development System Circuit BoardMicrocontrollerAug 14, 2002
Microprocessor using Xilinx FPGAMicrocontrollerJun 20, 2004
Arduino speech sythesizerMicrocontrollerJun 20, 2010
Interfacing an LCD touch control panel to an ArduinoMicrocontrollerJun 20, 2010
Temperature controlled based on AT89CX051MicrocontrollerJan 26, 2001
AFSK 1200 Modem based on PIC16C620MicrocontrollerJul 10, 2002
PicCon - Hidden Radio Transmitter ControllerMicrocontrollerJul 10, 2002
Scriptable thermometer / thermometric controller based around a COP8-CCR9-PLC44 microcontrollerMicrocontroller 
Cypress PSoC based digital wallet to record secret codes and passwords securelyMicrocontroller 
8049 Spy - read the internal ROM contents of a 8048 or 8049 processorMicrocontrollerSep 25, 2009
6802 Nano computerMicrocontrollerSep 25, 2009
AVR STK200/STK300 ISP Dongle circuit diagramMicrocontrollerSep 25, 2009
Tiny Eprom SimulatorMicrocontrollerSep 25, 2009
Arduino LFO Waveform Generator V2MicrocontrollerMay 19, 2015
Microprocessor RS-232 ResetMicrocontrollerSep 21, 2006
AT90S8515 experimenter boardMicrocontrollerNov 27, 2002
Wisp628 ISP Microchip PIC ProgrammerMicrocontrollerAug 09, 2002
WLoader - PIC16F877 application loader / bootloaderMicrocontrollerMay 01, 2004
Poor man's analog to digital converter (ADC) using a 2N222 transistor and a few passives (PDF)Microcontroller 
Nixie clock (PIC16F876)MicrocontrollerJun 18, 2003
Atmel Mega88 Dual Temperatur meterMicrocontroller 
Darkroom timer using PIC16F84AMicrocontrollerMar 07, 2009
Interfacing a DSLR Hotshoe to an ArduinoMicrocontrollerMar 27, 2014
Serial LCD controller using a PIC16F628Microcontroller 
Microprocessor based home security systemMicrocontrollerOct 25, 2014
Temperature Indicator Using AT89C52MicrocontrollerDec 07, 2014
Arduino Mega 2560 schematic (PDF) - Arduino R3MicrocontrollerJul 21, 2013
PIC Light Chaser using PIC16C84Microcontroller 
Build a PIC controlled DDS VFO, 0 to 6 MHzMicrocontrollerJul 12, 2001
Iambic keyer based on a PIC16F84 or PIC16C84MicrocontrollerJun 19, 2011
PIC18F4550 Development Board including PCB layout suitable for home etchingMicrocontrollerJun 19, 2011
Parallel AVR programmerMicrocontrollerMay 01, 2004
LCD thermometer using PIC16F871Microcontroller 
Electronic irrigation controller based on PICMicrocontroller 
'Almost No Parts' 7-segments 12/24 Hours LED clock with PIC 16F84A or 16F628AMicrocontrollerSep 25, 2009
A PIC-based "TDOA" RDF (radio direction finder) antenna unitMicrocontrollerApr 14, 2011
SD card interface for PIC microcontroller including schematic and source codeMicrocontrollerMay 16, 2010
Speech Synthesizer Development System using a PIC microcontrollerMicrocontrollerMay 16, 2010
PIC micro programmer that runs under MAC, Win98, XP, Vista, DOS, Linux, etcMicrocontrollerMay 24, 2010
Programmer PIC16F84,12C50x and EEPROM 24CxxMicrocontrollerAug 14, 2002
Touch senstor based on Atmel AT90S2313Microcontroller 
Programming hardware and softrware for 14-bit FLASH PIC microcontrollersMicrocontrollerFeb 25, 2011
90S2313 AVR Robot BoardMicrocontrollerMay 01, 2004
ATmega8 based TNC with GPS and WX supportMicrocontrollerMar 27, 2009
Atmel AVR 90s2313 based POCSAG encoder (ZIP file)MicrocontrollerMar 27, 2009
Atmel 90s2313 based TNCMicrocontrollerMar 27, 2009
ATmega48 based Nixie ClockMicrocontrollerMar 27, 2009
POCSAG encoder/decoder (Zip file)MicrocontrollerJul 10, 2002
Ultrasonic Distance Measurer based on Freescale MC9RS08KA2 (PDF)Microcontroller 
CASIO datalogger system based around Microchip PIC microcontrollerMicrocontroller 
Measuring Acceleration Using a PIC Microcontroller (ADXL202 + PIC16F84A)MicrocontrollerJan 09, 2010
PIC serial communications tutorial, includes circuit diagram and PIC16F84 assembler codeMicrocontrollerJan 09, 2010
Driving high-power loads with a microprocessorMicrocontroller 
Simple 10 bit DAC for the Arduino using TLC274 opampMicrocontrollerJun 07, 2011
IDE interface to a Microchip PIC16F877 microcontrollerMicrocontroller 
PIC Project #1 - RS232 to I2C InterfaceMicrocontrollerJan 26, 2001
AVR-Based Serial Port IR ReceiverMicrocontrollerOct 23, 2002
SPI2CF, a fast and efficient WLAN interface for the AVRMicrocontroller 
10 tricks for interfacing to the PIC16C508MicrocontrollerNov 05, 2009
Circuit to connect a rotary encoder to a Arduino UNOMicrocontrollerJul 21, 2013
PIC-Programmer 2 circuit diagram with links to programming softwareMicrocontrollerJun 09, 2002
PIC-Programmer 2 for PIC16C84 etc circuit diagram with links to programming toolsMicrocontroller 
AVR910 - AVR ProgrammerMicrocontrollerJun 07, 2011
AVR thermometer using AT90S2313 and DS1820MicrocontrollerMay 19, 2015
HC-11 Evaluation BoardMicrocontrollerMay 19, 2015
SBC built with 16-bit Intel Embedded Microprocessor, 80C186EBMicrocontrollerMay 19, 2015
16-bit microprocessor learning board based on Intel 80C188EB Embedded MicroprocessorMicrocontrollerMay 19, 2015
C-52 Evaluation Board based on a 89C52MicrocontrollerMay 19, 2015
C-52 Evaluation Board V2.0 based on a 89C52MicrocontrollerMay 19, 2015
C-52 Evaluation Board Robot ControllerMicrocontrollerMay 19, 2015
Cheap Loader Cable of Asim's ISP for 89S51 89S52MicrocontrollerMay 19, 2015
Electronic distance meter based on Motorola 68HC908QY4MicrocontrollerJun 20, 2004
Easy-Downloader V1.1 for ATMEL 89C2051/4051MicrocontrollerMay 19, 2015
Easy-Downloader V1.1 with SDCCMicrocontrollerMay 19, 2015
Atmel AVR ATMega 8535/16/32 and AT89S5x family learning kitMicrocontrollerJun 07, 2011
Make your own PIC ProgrammerMicrocontrollerMay 19, 2015
F84 low-cost and very simple serial programmer for a PIC16F84 Microchip Flash MicrocontrollerMicrocontrollerMay 19, 2015
F84 simple real-time controller with PIC16F84 running at low powerMicrocontrollerMay 19, 2015
Fan timer based on Motorola 68HC908QT2MicrocontrollerJun 20, 2004
Isolated RS232C for PIC16F84 or other microcontrollersMicrocontrollerJun 19, 2011
ISP Flash Microcontroller Programmer for Atmel DevicesMicrocontrollerMay 19, 2015
Atmel AVR and 8051 series ISP programmerMicrocontrollerJun 20, 2004
Microcontroller sensor and actuator interfacesMicrocontrollerApr 27, 2003
Complete Design for Giant 8-foot LCD Counter (Zip file)MicrocontrollerMar 27, 2009
PIC12C509 logic gate replacement for nitrogen filler (ZIP file)MicrocontrollerMar 01, 2003
PIC demo boardMicrocontrollerOct 31, 2002
Acceleration monitor using ADXL202 and AVRMicrocontrollerNov 27, 2002
40+ MHz 5-digit frequency counter with an AVR 2313MicrocontrollerNov 27, 2002
Interfacing DRAM to AT90S8515MicrocontrollerNov 27, 2002
Temperature monitor/controller: AVR 2313 / DS1621MicrocontrollerNov 27, 2002
PIC micro to ISA bus interfaceMicrocontrollerApr 17, 2004
Microchip PIC ICD (in-circuit debugger)MicrocontrollerJun 18, 2003
Variety of circuits for RS232 to TTL Signal ConversionMicrocontroller 
Variety of circuits for TTL to RS232 Signal ConversionMicrocontroller 
Tony Nixons Pocket Programmer (PIC)MicrocontrollerOct 13, 2002
PicoWeb V5.1 (AT90S8515) tiny web serverMicrocontrollerJan 31, 2003
Atmel 89C2051 In-Circuit Programmer SchematicMicrocontrollerJun 20, 2004
8051 Development System Circuit BoardMicrocontrollerSep 13, 2006
8051 Development System Circuit BoardMicrocontrollerOct 23, 2002
I2C LCD interfaceMicrocontrollerMay 01, 2004
PIC16F84 tone generator with source codeMicrocontrollerMar 01, 2003
PIC16F84 tone generatorMicrocontrollerJul 10, 2002
PIC16F84 tone generator (6-Bit)MicrocontrollerJul 10, 2002
RS232 interfaced DVM using a PIC12F675 including source code for CCS C CompilerMicrocontrollerSep 09, 2009
ScanMate audio activated recordedMicrocontrollerJan 26, 2001
Low cost Atmel in-system programmerMicrocontrollerApr 17, 2004
Ultra low-cost programmer for AT90S familyMicrocontrollerApr 17, 2004
Connecting AT90S2313 with LCD display 2x16 char and 4x4 keypadMicrocontrollerApr 17, 2004
Electronic safety lock based on ATtiny26MicrocontrollerApr 17, 2004
128x64 LCD Driver for AT90S2313 (ZIP file)MicrocontrollerApr 17, 2004
Connecting LED to PIC Micro I/O pins (PDF)MicrocontrollerNov 17, 2002
Ultrasonic Distance Measurement With the MSP430 (PDF)Microcontroller 
TTL to RS232 adapter using 2N3906 / 2N3904 transistorsMicrocontroller 
PIC16F876 DataloggerMicrocontrollerJul 24, 2002
Atmel Mega88 Temperatur meter, Type K sensor, Heat set and regulatorMicrocontroller 
PIC16 DemoKit3 with programmer and displaysMicrocontroller 
Easy debugging serial terminal with LCD displayMicrocontrollerMay 19, 2015
AT89C2051 line-follower robotMicrocontrollerJan 26, 2001
M-Logger V1.0 based on PIC18F46J11 microcontroller and a DS1820 temperature sensorMicrocontrollerMay 19, 2015
MTK-85 8085 Microprocessor Training KitMicrocontrollerJun 07, 2011
In-Circuit PIC Loader (parallel port based)MicrocontrollerMay 19, 2015
PIC18F2550 Project BoardMicrocontrollerMay 19, 2015
Atmel 89C2051prototyping boardMicrocontrollerApr 22, 2014
S-52 Simple Learning Board using Atmel AT89S52MicrocontrollerMay 19, 2015
Night light saver (PIC12C508)MicrocontrollerJun 09, 2002
SPI Flash Microcontroller Programmer for 8051 and AVR series devicesMicrocontrollerMay 19, 2015
Atmel 89S and AVR Programmer (STK200)MicrocontrollerJun 07, 2011
Thermistor Thermometer using 12-bit ADC, 89S52 and LED displayMicrocontrollerMay 19, 2015
Thermistor Thermometer: LCD versionMicrocontrollerMay 19, 2015
Tiny 2313 Project Development BoardMicrocontrollerJun 07, 2011
USB and GLCD expansion board for 8051 SBCMicrocontrollerJun 20, 2004
USB Easy-Downloader V5.0 for 89S52 and SST89E516RD chips with USB port connectionMicrocontrollerMay 19, 2015
AT89C2051 Programmer using Linux terminalMicrocontrollerApr 22, 2014