There are 111 circuit schematics available in this category. Click here for all circuit diagrams. The Last circuit was added on Thursday, 14 January 2016.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 
Yaesu FT-897 - PC interface (PDF)PC Status0 vote up vote down
RS-232 line monitor and loopback cablesPCJan 26, 2001Status1 vote up vote down
Simple RS232 Level Converter based on a MAX232 including Eagle PCB and schematic filesPCJun 28, 2011Status1 vote up vote down
PC-based candle ignitor (parallel port based design)PCDec 07, 2014Status1 vote up vote down
PC-Based DC Motor Speed ControllerPCOct 25, 2014Status0 vote up vote down
Bell 202 and CCITT V23 Compatible FSK Modem CircuitPCOct 27, 2009Status0 vote up vote down
Three Wire RS232 To RS485 ConverterPCJan 08, 2014Status0 vote up vote down
PC Audio Signal Generator Using RS232 PortPCOct 03, 2013Status0 vote up vote down
Commodore 64 24-bit parallel port interface with 8255PCMar 23, 2003Status0 vote up vote down
USB digital I/O extender using a PIC18F14K50PCApr 12, 2014Status0 vote up vote down
Transceiver to PC soundblaster interface for digital operating modes (PSK-31, RTTY, SSTV etc)PCOct 07, 2009Status0 vote up vote down
Transceiver to PC interface with a hardware DTMF detector and galvanic isolation (PDF)PCOct 07, 2009Status0 vote up vote down
PC serial port parastic mode interface for 1-wire DS18S20 and similar 1-wire temperature sensorsPCJun 28, 2011Status0 vote up vote down
Small circuit and PCB layout for recording to PC Sound Monitor / Pre-ampPCFeb 26, 2010Status0 vote up vote down
Ericsson phone to PC serial port interfacePCNov 29, 2002Status-1 vote up vote down
Magnetic card reader to PC RS-232 port interface based on a PIC12F675 microPCMay 24, 2010Status0 vote up vote down
RS-232 to TTL level translatorPCMay 16, 2010Status0 vote up vote down
RS232 to RS485 converter schematic to connect PC to RS485 networkPCApr 09, 2010Status0 vote up vote down
RS232 serial to USB converter cable circuit schematicPC Status0 vote up vote down
Mac to HP48 cable pinoutPCSep 10, 2006Status0 vote up vote down
Game boy camera PC serial interfacePCSep 13, 2006Status0 vote up vote down
300/1200 baud BAYCOM MODEM (revision and improved)PC Status0 vote up vote down
HAMCOM (SSTV, RTTY, FAX...) modem using PC-speaker for TXPC Status0 vote up vote down
PTT and/or soundcard interfacePC Status1 vote up vote down
PTT and soundcard interface for the TM255/455PC Status0 vote up vote down
HAMCOM (SSTV, RTTY, FAX...) modem using serial audio for TXPC Status0 vote up vote down
HAMCOM & SoundCard MODEM using serial- or soundcard audioPC Status0 vote up vote down
TM-441 9600bps packet modificationPC Status0 vote up vote down
Using a PC power supply as a benchtop power supplyPC Status0 vote up vote down
Computer Controlled Frequency Counter/Logic ProbePCSep 01, 2009Status0 vote up vote down
Circuits to computerize your room/housePCSep 01, 2009Status0 vote up vote down
Simple Parallel (Printer) Port InterfacePCSep 01, 2009Status0 vote up vote down
The KD2BD Pacsat ModemPCJul 10, 2002Status0 vote up vote down
SWTP PR-40 Printer Interface SchematicsPCSep 10, 2006Status0 vote up vote down
A Serial Infrared Remote ControllerPCJan 26, 2001Status0 vote up vote down
General purpose ISA interface card for PCPC Status0 vote up vote down
PC ISA Card Random Number GeneratorPC Status0 vote up vote down
MIDI cable for Sound Blaster cardsPC Status0 vote up vote down
PC ISA board containing a Z80 microprocessor (coprocessor card)PC Status0 vote up vote down
Analog Signal Acquisition for PC Printer PortPCJan 26, 2001Status0 vote up vote down
More accurate PC/AT clockPCJan 26, 2001Status0 vote up vote down
Getting power from RS-232 interfacePCJan 26, 2001Status0 vote up vote down
PC based Frequency MeterPC Status0 vote up vote down
7 segment rolling display using PCPC Status0 vote up vote down
SmartCard PC EmulatorPCFeb 21, 2005Status0 vote up vote down
Relay interface add-on board for PCPCFeb 21, 2005Status0 vote up vote down
8-way relay interface board for PC parallel printer portPCFeb 21, 2005Status0 vote up vote down
Stepper motor controller for PC parallel portPCFeb 21, 2005Status0 vote up vote down
3-axis stepper motor controller for PC parallel portPCFeb 21, 2005Status0 vote up vote down
PC based thermometer based on Dallas DS1621PCFeb 21, 2005Status0 vote up vote down
Connect two CD-ROM drives to one soundcardPCJan 26, 2001Status0 vote up vote down
Headphone driving circuit for soundcardsPCJan 26, 2001Status0 vote up vote down
Get power out of PC parallel portPCJan 26, 2001Status0 vote up vote down
Null Printer AdapterPCJan 26, 2001Status0 vote up vote down
PC speaker volume control circuitPCJan 26, 2001Status0 vote up vote down
How to get power from PC to your circuitsPCJan 26, 2001Status0 vote up vote down
RS-232 surge protectionPCJan 26, 2001Status0 vote up vote down
Simple RS-232 serial port buffer circuitPCJan 26, 2001Status0 vote up vote down
Get power out of PC RS-232 portPCJan 26, 2001Status0 vote up vote down
Sound Blaster Microphone PreamplifierPCJan 26, 2001Status0 vote up vote down
Sega 3D glasses interface circuit diagramsPCJan 26, 2001Status0 vote up vote down
Convert Atari-style joystick to PC joystick portPCJan 26, 2001Status0 vote up vote down
Fake Joystick circuitPCJan 26, 2001Status0 vote up vote down
Using the joystick port as general purpose inputPCJan 26, 2001Status0 vote up vote down
Connect other circuits to PC joystick portPCJan 26, 2001Status0 vote up vote down
Build your own iRDA SIR Transceiver (Dongle) using MCP2120PCAug 27, 2003Status0 vote up vote down
GPS receiver (Gamin, Eagle etc) to PC interface cablesPCMar 23, 2003Status0 vote up vote down
Z80 Computer circuit diagramPCAug 18, 2009Status0 vote up vote down
The Great Z80 Computer ProjectPCAug 18, 2009Status1 vote up vote down
Ethernet interface for Commodore 64 computerPC Status0 vote up vote down
i2c-tiny-usb, a simple i2c interface for the usb portPC Status0 vote up vote down
LCD2USB, cheap open source text LCD interfacePC Status0 vote up vote down
TiltStick, a motion sensing device (USB interface to accelerometer)PC Status0 vote up vote down
Building an Infrared Transmitter for Your PCPC Status0 vote up vote down
FM radio for a PIC (uses TDA7000 IC which is now obsolete)PCSep 08, 2009Status0 vote up vote down
Serial servo controller for interfacing hobby servos via RS232 to a PCPC Status0 vote up vote down
New and Improved Sound Card Packet Interface tested with PSK31 and APRSPCOct 27, 2009Status0 vote up vote down
Sanyo 20EZ monitor circuit diagramPCMar 18, 2003Status0 vote up vote down
PC-based ISA data acquisition and control boardPCSep 13, 2006Status0 vote up vote down
Linux Infra-red Remote Control (LIRC)PCApr 12, 2001Status0 vote up vote down
Build your own MARES dive computer IRIS interface for RS232PCOct 04, 2010Status0 vote up vote down
Homebuilt RS232 LCD InterfacePCJun 18, 2003Status0 vote up vote down
Homemade Serial to Nokia MBus Interface on a PCB, without using Zener diodesPC Status0 vote up vote down
Machine Independent Parallel InterfacePC Status0 vote up vote down
PG31 GPS RS232 GPS development boardPC Status0 vote up vote down
PG31 GPS RS232 USB development boardPC Status0 vote up vote down
RS232 RS485 USB Converter BoardPC Status0 vote up vote down
CCD linear image sensor to PC parallel interfacePCJun 20, 2004Status0 vote up vote down
ADMS programming Cable for the Yaesu FT50, VX1 and VX5PCMay 07, 2010Status0 vote up vote down
Radio Interface Box for the Motorola Radius GP300PCMay 07, 2010Status0 vote up vote down
PG4S programming Cable for the Kenwood TM-V7 and TM-G707PCMay 07, 2010Status0 vote up vote down
Laptop Computer Serial Port Power BoosterPCApr 12, 2001Status0 vote up vote down
SPDIF RCA to (Optical + RCA) AdapterPCMay 07, 2010Status0 vote up vote down
Various sound card interfacing circuit diagramsPC Status0 vote up vote down
Assorted computer interface circuitsPCMar 18, 2003Status0 vote up vote down
Apple II/II+/IIe IDE Drive InterfacePCOct 31, 2002Status0 vote up vote down
Simple stepper motor driver for PC parallel portPC Status0 vote up vote down
MS-DOS EEPROM ProgrammerPCSep 25, 2009Status0 vote up vote down
SB-Bus Drivers Introduction and Circuit DiagramsPCSep 25, 2009Status0 vote up vote down
RS-232 to TTL cablePCMay 01, 2004Status0 vote up vote down
9-pin null modem cablePCJan 26, 2001Status0 vote up vote down
PC Automatic Power-on CircuitPCMay 19, 2015Status0 vote up vote down
Circuit for interfacing a relay / solenoid to a PC based on a 2N7000 FETPCSep 01, 2009Status0 vote up vote down
How to construct Garmin GPS receiver interface cablesPCMar 23, 2003Status0 vote up vote down
Jasmin floppy disk controller schematicsPCSep 13, 2006Status0 vote up vote down
RS232 - Lowe HF-225 interfacePCNov 21, 2002Status0 vote up vote down
Serial to parallel converter - connect a large number of digital outputs to a PC parallel portPC Status0 vote up vote down
PC parallel port eight DC power switch cam driver two unipolar stepper motors, lights etcPC Status0 vote up vote down
Pic-Plot GPIB to RS-232 converterPC Status0 vote up vote down
Pic-Plot2 GPIB to USB converterPC Status0 vote up vote down
24 Line Parallel Interface for the PC - old ISA based design (PDF)PCJul 10, 2015Status0 vote up vote down