There are 133 circuit schematics available in this category. Click here for all circuit diagrams. The Last circuit was added on Saturday, January 28, 2023.Please note some adblockers will suppress the schematics as well as the advertisement so please disable if the schematic list is empty.

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CircuitCategoryDate AddedOK?Votes 
AT89C2051 serial COMs to LED driverMicrocontrollerApr 12, 2024Status16 vote up vote down
Serial to parallel converter using the AT89C2051MicrocontrollerJan 26, 2025Status-1 vote up vote down
Simple CW Keyer based on Atmel ATtiny 2313Microcontroller Status-1 vote up vote down
PIC16F628 controlled FLL (Frequency Locked Loop) VFO for HF (PDF)MicrocontrollerOct 05, 2024Status2 vote up vote down
PIC16F84 CW decoder (PDF)MicrocontrollerJul 10, 2024Status0 vote up vote down
Atmel AVR ATtiny45 development boardMicrocontrollerJun 28, 2024Status0 vote up vote down
AVR thermometer / thermostat based on an Atmel ATtiny2313MicrocontrollerJun 28, 2024Status-1 vote up vote down
Serial LCD controller using a PIC16F628Microcontroller Status3 vote up vote down
Microprocessor based home security systemMicrocontrollerOct 25, 2024Status1 vote up vote down
Temperature Indicator Using AT89C52MicrocontrollerDec 07, 2024Status-1 vote up vote down
PIC Light Chaser using PIC16C84Microcontroller Status-2 vote up vote down
ADC conversion using ADC0804LCN and 8051Microcontroller Status-1 vote up vote down
Build a PIC controlled DDS VFO, 0 to 6 MHzMicrocontrollerJul 12, 2024Status-5 vote up vote down
Iambic keyer based on a PIC16F84 or PIC16C84MicrocontrollerJun 19, 2024Status0 vote up vote down
PIC18F4550 Development Board including PCB layout suitable for home etchingMicrocontrollerJun 19, 2024Status-1 vote up vote down
PIC16F84 line following robotMicrocontrollerJan 26, 2025Status-2 vote up vote down
PIC16C505 IR / wireless remote controlMicrocontrollerMar 23, 2024Status-2 vote up vote down
DIY 2^16 encoder based on PICMicrocontrollerApr 12, 2024Status-2 vote up vote down
Automatic door opener with PIC12C508MicrocontrollerMar 01, 2025Status-2 vote up vote down
3-wire serial LCD interface for the PICMicrocontroller Status-1 vote up vote down
RS485-like multi-drop bus with half duplex serial protocolMicrocontrollerMar 23, 2024Status-1 vote up vote down
LCD thermometer using PIC16F871Microcontroller Status0 vote up vote down
Electronic irrigation controller based on PICMicrocontroller Status-1 vote up vote down
'Almost No Parts' 7-segments 12/24 Hours LED clock with PIC 16F84A or 16F628AMicrocontrollerSep 25, 2024Status-4 vote up vote down
A PIC-based "TDOA" RDF (radio direction finder) antenna unitMicrocontrollerApr 14, 2024Status1 vote up vote down
Singing Christmas tree based on Microchip PIC16F84MicrocontrollerOct 07, 2024Status-1 vote up vote down
50 MHz frequency counter, voltage meter & SWR/PWR indicatorMicrocontrollerJul 12, 2024Status-1 vote up vote down
Serial LCD Controller using Microchip PIC16F628Microcontroller Status-1 vote up vote down
Dirt cheap video using a PIC16F819 microcontrollerMicrocontrollerMay 16, 2024Status-1 vote up vote down
Talking fish hack using a PIC16F819 microcontrollerMicrocontrollerMay 16, 2024Status-1 vote up vote down
SD card interface for PIC microcontroller including schematic and source codeMicrocontrollerMay 16, 2024Status-2 vote up vote down
Speech Synthesizer Development System using a PIC microcontrollerMicrocontrollerMay 16, 2024Status1 vote up vote down
Touch senstor based on Atmel AT90S2313Microcontroller Status0 vote up vote down
LCD clock based on AVR Attiny2313Microcontroller Status-2 vote up vote down
101 AT Keyboard to ASCII Decoder using 68HC705J1A MCUMicrocontrollerJan 26, 2025Status-1 vote up vote down
PIXpand - TI calculator to Playstation memory card interfaceMicrocontrollerJul 12, 2024Status0 vote up vote down
90S2313 AVR Robot BoardMicrocontrollerMay 01, 2024Status1 vote up vote down
ATmega8 based TNC with GPS and WX supportMicrocontrollerMar 27, 2024Status-2 vote up vote down
Atmel AVR 90s2313 based POCSAG encoder (ZIP file)MicrocontrollerMar 27, 2024Status1 vote up vote down
Atmel 90s2313 based TNCMicrocontrollerMar 27, 2024Status0 vote up vote down
POCSAG encoder/decoder (Zip file)MicrocontrollerJul 10, 2024Status-1 vote up vote down
Measuring Acceleration Using a PIC Microcontroller (ADXL202 + PIC16F84A)MicrocontrollerJan 09, 2025Status-1 vote up vote down
PIC serial communications tutorial, includes circuit diagram and PIC16F84 assembler codeMicrocontrollerJan 09, 2025Status-1 vote up vote down
Driving high-power loads with a microprocessorMicrocontroller Status-1 vote up vote down
IDE interface to a Microchip PIC16F877 microcontrollerMicrocontroller Status0 vote up vote down
PIC sonar (ultrasonic) range finding project with seven segment display using PIC microMicrocontroller Status0 vote up vote down
A Real Time Clock IC (DS1307) project using the PIC microMicrocontroller Status-2 vote up vote down
PIC Serial LCD project - An RS232 serial LCD interface using a standard HD44780 LCDMicrocontroller Status-1 vote up vote down
Connect a Serial LCD Display to Raspberry PiMicrocontrollerMar 23, 2024Status-2 vote up vote down
RS-232 to TTL TranslatorMicrocontroller Status-1 vote up vote down
Serial port I/O interface using AVR microcontrollerMicrocontroller Status0 vote up vote down
MMC to PIC16F876 circuit diagramMicrocontrollerJun 18, 2024Status-1 vote up vote down
Circuits for interfacing microcontrollers to a wide number of real-word interfacesMicrocontroller Status-1 vote up vote down
Hardware Random Number Generator with an SX microcontrollerMicrocontroller Status-1 vote up vote down
8088 maximum mode SBCMicrocontrollerNov 16, 2024Status-1 vote up vote down
EZ80 single board computer schematic (Z80)MicrocontrollerApr 27, 2024Status-1 vote up vote down
8051 Development System Circuit Board circuit diagramMicrocontrollerJun 20, 2024Status-1 vote up vote down
Long-period watchdog timerMicrocontrollerJan 26, 2025Status0 vote up vote down
PIC Web Server SchematicMicrocontrollerSep 13, 2024Status-1 vote up vote down
IR On/Off Switch Using a PIC12F629 MicrocontrollerMicrocontrollerNov 13, 2024Status-2 vote up vote down
PIC ICDMicrocontrollerOct 23, 2024Status-2 vote up vote down
PIC Project #1 - RS232 to I2C InterfaceMicrocontrollerJan 26, 2025Status-1 vote up vote down
Using an ADXL330 accelerometer with an AVR microcontrollerMicrocontrollerJan 09, 2025Status-1 vote up vote down
Ultrasonic Distance Measurer based on Freescale MC9RS08KA2 (PDF)Microcontroller Status-1 vote up vote down
Asynchronous 40-bit TTL CPUMicrocontrollerAug 18, 2024Status-1 vote up vote down
AVR-Based Serial Port IR ReceiverMicrocontrollerOct 23, 2024Status-1 vote up vote down
SPI2CF, a fast and efficient WLAN interface for the AVRMicrocontroller Status-1 vote up vote down
10 tricks for interfacing to the PIC16C508MicrocontrollerNov 05, 2024Status-1 vote up vote down
Speech recognition using HM2007MicrocontrollerNov 29, 2024Status-1 vote up vote down
PIC microcontroller servo motor interfaceMicrocontrollerNov 29, 2024Status-1 vote up vote down
PIC micro multiple servo motor interfaceMicrocontrollerNov 29, 2024Status-1 vote up vote down
GPS LCD Display ProjectMicrocontrollerJul 24, 2024Status-1 vote up vote down
PIC16F84 LED chaserMicrocontrollerNov 17, 2024Status-1 vote up vote down
PIC micro LED projectsMicrocontrollerJun 18, 2024Status-1 vote up vote down
PS/2 keyboard keystroke logger based on Atmel 89C2051MicrocontrollerJun 20, 2024Status-1 vote up vote down
Microcontroller sensor and actuator interfacesMicrocontrollerApr 27, 2024Status-1 vote up vote down
Complete Design for Giant 8-foot LCD Counter (Zip file)MicrocontrollerMar 27, 2024Status-1 vote up vote down
PIC12C509 logic gate replacement for nitrogen filler (ZIP file)MicrocontrollerMar 01, 2025Status-1 vote up vote down
PIC demo boardMicrocontrollerOct 31, 2024Status-1 vote up vote down
PIC12C509 Gym Timer (ZIP file)MicrocontrollerMar 01, 2025Status-1 vote up vote down
PIC LCD and Keypad driverMicrocontrollerOct 31, 2024Status-2 vote up vote down
PIC12C508 Phase Controller for 2kW heater (ZIP file)MicrocontrollerMar 01, 2025Status-1 vote up vote down
PIC16F84 TRIAC / IGBT brightness phase controllerMicrocontrollerMar 01, 2025Status0 vote up vote down
PIC16F84 pulse monitor with date/time output (ZIP)MicrocontrollerMar 01, 2025Status-1 vote up vote down
PIC based touch clock that demonstrates interfacing a PIC microcontroller to an LCD touch panelMicrocontrollerJun 27, 2024Status-1 vote up vote down
A PIC16F84A Alarm ClockMicrocontrollerJun 27, 2024Status0 vote up vote down
A Voice Controlled LED Light Show using a VRStampMicrocontrollerJun 27, 2024Status-1 vote up vote down
Cheap Ultrasonic Range Finder based on a PIC microcontrollerMicrocontrollerJun 27, 2024Status-1 vote up vote down
Cheap Ultrasonic Range Finder based on PIC16F877A with a 8MHz crystalMicrocontroller Status0 vote up vote down
A PIC16F819 Dymoclock (also demonstrates interfacing 30 LEDs to a PIC using only six I/O pins)MicrocontrollerJun 27, 2024Status-1 vote up vote down
EasyPic2 with on-board Ethernet AdapterMicrocontrollerJun 27, 2024Status-1 vote up vote down
PIC micro to ISA bus interfaceMicrocontrollerApr 17, 2024Status-1 vote up vote down
Linuxstamp general purpose processor module based on Atmel AT91RM9200Microcontroller Status-1 vote up vote down
PC to microcontroller communications using power from the PC serial portMicrocontroller Status-1 vote up vote down
Microchip PIC ICD (in-circuit debugger)MicrocontrollerJun 18, 2024Status-2 vote up vote down
Variety of circuits for RS232 to TTL Signal ConversionMicrocontroller Status-1 vote up vote down
Variety of circuits for TTL to RS232 Signal ConversionMicrocontroller Status-1 vote up vote down
PicoWeb V5.1 (AT90S8515) tiny web serverMicrocontrollerJan 31, 2025Status-1 vote up vote down
8051 Development System Circuit BoardMicrocontrollerSep 13, 2024Status-1 vote up vote down
8051 Development System Circuit BoardMicrocontrollerOct 23, 2024Status-1 vote up vote down
8051 Development System Circuit BoardMicrocontrollerAug 14, 2024Status-2 vote up vote down
Microprocessor using Xilinx FPGAMicrocontrollerJun 20, 2024Status-1 vote up vote down
Temperature controlled based on AT89CX051MicrocontrollerJan 26, 2025Status-2 vote up vote down
I2C LCD interfaceMicrocontrollerMay 01, 2024Status-1 vote up vote down
AFSK 1200 Modem based on PIC16C620MicrocontrollerJul 10, 2024Status0 vote up vote down
PicCon - Hidden Radio Transmitter ControllerMicrocontrollerJul 10, 2024Status0 vote up vote down
PIC16F84 tone generator with source codeMicrocontrollerMar 01, 2025Status0 vote up vote down
PIC16F84 tone generatorMicrocontrollerJul 10, 2024Status0 vote up vote down
PIC16F84 tone generator (6-Bit)MicrocontrollerJul 10, 2024Status0 vote up vote down
RS232 interfaced DVM using a PIC12F675 including source code for CCS C CompilerMicrocontrollerSep 09, 2024Status0 vote up vote down
8049 Spy - read the internal ROM contents of a 8048 or 8049 processorMicrocontrollerSep 25, 2024Status0 vote up vote down
6802 Nano computerMicrocontrollerSep 25, 2024Status0 vote up vote down
AVR STK200/STK300 ISP Dongle circuit diagramMicrocontrollerSep 25, 2024Status0 vote up vote down
Tiny Eprom SimulatorMicrocontrollerSep 25, 2024Status0 vote up vote down
ScanMate audio activated recordedMicrocontrollerJan 26, 2025Status0 vote up vote down
Connecting AT90S2313 with LCD display 2x16 char and 4x4 keypadMicrocontrollerApr 17, 2024Status0 vote up vote down
Electronic safety lock based on ATtiny26MicrocontrollerApr 17, 2024Status0 vote up vote down
128x64 LCD Driver for AT90S2313 (ZIP file)MicrocontrollerApr 17, 2024Status0 vote up vote down
Connecting LED to PIC Micro I/O pins (PDF)MicrocontrollerNov 17, 2024Status-1 vote up vote down
Microprocessor RS-232 ResetMicrocontrollerSep 21, 2024Status0 vote up vote down
AT90S8515 experimenter boardMicrocontrollerNov 27, 2024Status0 vote up vote down
Ultrasonic Distance Measurement With the MSP430 (PDF)Microcontroller Status2 vote up vote down
TTL to RS232 adapter using 2N3906 / 2N3904 transistorsMicrocontroller Status0 vote up vote down
PIC16F876 DataloggerMicrocontrollerJul 24, 2024Status2 vote up vote down
WLoader - PIC16F877 application loader / bootloaderMicrocontrollerMay 01, 2024Status0 vote up vote down
Poor man's analog to digital converter (ADC) using a 2N222 transistor and a few passives (PDF)Microcontroller Status-2 vote up vote down
Atmel Mega88 Dual Temperatur meterMicrocontroller Status0 vote up vote down
Atmel Mega88 Temperatur meter, Type K sensor, Heat set and regulatorMicrocontroller Status-1 vote up vote down
Darkroom timer using PIC16F84AMicrocontrollerMar 07, 2025Status0 vote up vote down
Mini dice - PIC10F200-based electronic diceMicrocontrollerJun 28, 2024Status2 vote up vote down
Voltmeter and Ammeter using PIC MicrocontrollerMicrocontrollerJan 14, 2025Status2 vote up vote down
PIC based digital voltmeter (DVM)MicrocontrollerJan 14, 2025Status-1 vote up vote down
Smart NiMh battery charger based on Attiny85MicrocontrollerApr 30, 2024Status0 vote up vote down