There are 116 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 
Yaesu FT-897 - PC interface (PDF)PC Status3 vote up vote down
RS-232 line monitor and loopback cablesPCJan 26, 2025Status3 vote up vote down
Simple RS232 Level Converter based on a MAX232 including Eagle PCB and schematic filesPCJun 28, 2024Status-2 vote up vote down
PC-based candle ignitor (parallel port based design)PCDec 07, 2024Status0 vote up vote down
PC-Based DC Motor Speed ControllerPCOct 25, 2024Status-3 vote up vote down
Bell 202 and CCITT V23 Compatible FSK Modem CircuitPCOct 27, 2024Status-1 vote up vote down
Three Wire RS232 To RS485 ConverterPCJan 08, 2025Status-2 vote up vote down
PC Audio Signal Generator Using RS232 PortPCOct 03, 2024Status-2 vote up vote down
Commodore 64 24-bit parallel port interface with 8255PCMar 23, 2024Status0 vote up vote down
USB digital I/O extender using a PIC18F14K50PCApr 12, 2024Status-2 vote up vote down
Transceiver to PC soundblaster interface for digital operating modes (PSK-31, RTTY, SSTV etc)PCOct 07, 2024Status-1 vote up vote down
Transceiver to PC interface with a hardware DTMF detector and galvanic isolation (PDF)PCOct 07, 2024Status0 vote up vote down
PC serial port parastic mode interface for 1-wire DS18S20 and similar 1-wire temperature sensorsPCJun 28, 2024Status-1 vote up vote down
Small circuit and PCB layout for recording to PC Sound Monitor / Pre-ampPCFeb 26, 2025Status-1 vote up vote down
Ericsson phone to PC serial port interfacePCNov 29, 2024Status-3 vote up vote down
Magnetic card reader to PC RS-232 port interface based on a PIC12F675 microPCMay 24, 2024Status0 vote up vote down
RS-232 to TTL level translatorPCMay 16, 2024Status-1 vote up vote down
RS232 to RS485 converter schematic to connect PC to RS485 networkPCApr 09, 2024Status-1 vote up vote down
RS232 serial to USB converter cable circuit schematicPC Status-1 vote up vote down
Mac to HP48 cable pinoutPCSep 10, 2024Status-1 vote up vote down
Game boy camera PC serial interfacePCSep 13, 2024Status-1 vote up vote down
300/1200 baud BAYCOM MODEM (revision and improved)PC Status-1 vote up vote down
HAMCOM (SSTV, RTTY, FAX...) modem using PC-speaker for TXPC Status-1 vote up vote down
PTT and/or soundcard interfacePC Status0 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 Status-1 vote up vote down
TM-441 9600bps packet modificationPC Status-1 vote up vote down
Using a PC power supply as a benchtop power supplyPC Status-1 vote up vote down
Computer Controlled Frequency Counter/Logic ProbePCSep 01, 2024Status-1 vote up vote down
Circuits to computerize your room/housePCSep 01, 2024Status-2 vote up vote down
Simple Parallel (Printer) Port InterfacePCSep 01, 2024Status-1 vote up vote down
The KD2BD Pacsat ModemPCJul 10, 2024Status-1 vote up vote down
SWTP PR-40 Printer Interface SchematicsPCSep 10, 2024Status-2 vote up vote down
A Serial Infrared Remote ControllerPCJan 26, 2025Status0 vote up vote down
General purpose ISA interface card for PCPC Status-1 vote up vote down
PC ISA Card Random Number GeneratorPC Status-1 vote up vote down
MIDI cable for Sound Blaster cardsPC Status-1 vote up vote down
PC ISA board containing a Z80 microprocessor (coprocessor card)PC Status-1 vote up vote down
PC based Frequency MeterPC Status-1 vote up vote down
7 segment rolling display using PCPC Status-1 vote up vote down
SmartCard PC EmulatorPCFeb 21, 2025Status-1 vote up vote down
Relay interface add-on board for PCPCFeb 21, 2025Status-1 vote up vote down
8-way relay interface board for PC parallel printer portPCFeb 21, 2025Status-1 vote up vote down
Stepper motor controller for PC parallel portPCFeb 21, 2025Status-2 vote up vote down
3-axis stepper motor controller for PC parallel portPCFeb 21, 2025Status-2 vote up vote down
PC based thermometer based on Dallas DS1621PCFeb 21, 2025Status-1 vote up vote down
Connect two CD-ROM drives to one soundcardPCJan 26, 2025Status-1 vote up vote down
Headphone driving circuit for soundcardsPCJan 26, 2025Status-1 vote up vote down
Get power out of PC parallel portPCJan 26, 2025Status-1 vote up vote down
Null Printer AdapterPCJan 26, 2025Status-1 vote up vote down
PC speaker volume control circuitPCJan 26, 2025Status-1 vote up vote down
How to get power from PC to your circuitsPCJan 26, 2025Status-1 vote up vote down
RS-232 surge protectionPCJan 26, 2025Status-1 vote up vote down
Simple RS-232 serial port buffer circuitPCJan 26, 2025Status-1 vote up vote down
Get power out of PC RS-232 portPCJan 26, 2025Status-1 vote up vote down
Sound Blaster Microphone PreamplifierPCJan 26, 2025Status-2 vote up vote down
Sega 3D glasses interface circuit diagramsPCJan 26, 2025Status-1 vote up vote down
Convert Atari-style joystick to PC joystick portPCJan 26, 2025Status-1 vote up vote down
Fake Joystick circuitPCJan 26, 2025Status-1 vote up vote down
Using the joystick port as general purpose inputPCJan 26, 2025Status-1 vote up vote down
Connect other circuits to PC joystick portPCJan 26, 2025Status-1 vote up vote down
Build your own iRDA SIR Transceiver (Dongle) using MCP2120PCAug 27, 2024Status-2 vote up vote down
GPS receiver (Gamin, Eagle etc) to PC interface cablesPCMar 23, 2024Status-1 vote up vote down
Z80 Computer circuit diagramPCAug 18, 2024Status1 vote up vote down
The Great Z80 Computer ProjectPCAug 18, 2024Status0 vote up vote down
Ethernet interface for Commodore 64 computerPC Status-2 vote up vote down
i2c-tiny-usb, a simple i2c interface for the usb portPC Status-1 vote up vote down
LCD2USB, cheap open source text LCD interfacePC Status-1 vote up vote down
TiltStick, a motion sensing device (USB interface to accelerometer)PC Status-1 vote up vote down
FM radio for a PIC (uses TDA7000 IC which is now obsolete)PCSep 08, 2024Status-1 vote up vote down
Serial servo controller for interfacing hobby servos via RS232 to a PCPC Status-1 vote up vote down
New and Improved Sound Card Packet Interface tested with PSK31 and APRSPCOct 27, 2024Status-1 vote up vote down
Sanyo 20EZ monitor circuit diagramPCMar 18, 2024Status-1 vote up vote down
PC-based ISA data acquisition and control boardPCSep 13, 2024Status-1 vote up vote down
Linux Infra-red Remote Control (LIRC)PCApr 12, 2024Status-2 vote up vote down
Build your own MARES dive computer IRIS interface for RS232PCOct 04, 2024Status-1 vote up vote down
Homebuilt RS232 LCD InterfacePCJun 18, 2024Status-1 vote up vote down
Homemade Serial to Nokia MBus Interface on a PCB, without using Zener diodesPC Status-1 vote up vote down
Machine Independent Parallel InterfacePC Status-1 vote up vote down
PG31 GPS RS232 GPS development boardPC Status-1 vote up vote down
PG31 GPS RS232 USB development boardPC Status-1 vote up vote down
RS232 RS485 USB Converter BoardPC Status-1 vote up vote down
CCD linear image sensor to PC parallel interfacePCJun 20, 2024Status-1 vote up vote down
ADMS programming Cable for the Yaesu FT50, VX1 and VX5PCMay 07, 2024Status0 vote up vote down
Radio Interface Box for the Motorola Radius GP300PCMay 07, 2024Status-1 vote up vote down
PG4S programming Cable for the Kenwood TM-V7 and TM-G707PCMay 07, 2024Status0 vote up vote down
Laptop Computer Serial Port Power BoosterPCApr 12, 2024Status-1 vote up vote down
SPDIF RCA to (Optical + RCA) AdapterPCMay 07, 2024Status-1 vote up vote down
Various sound card interfacing circuit diagramsPC Status-1 vote up vote down
Assorted computer interface circuitsPCMar 18, 2024Status-2 vote up vote down
Apple II/II+/IIe IDE Drive InterfacePCOct 31, 2024Status-1 vote up vote down
Simple stepper motor driver for PC parallel portPC Status-1 vote up vote down
MS-DOS EEPROM ProgrammerPCSep 25, 2024Status-1 vote up vote down
SB-Bus Drivers Introduction and Circuit DiagramsPCSep 25, 2024Status-1 vote up vote down
RS-232 to TTL cablePCMay 01, 2024Status-1 vote up vote down
9-pin null modem cablePCJan 26, 2025Status-2 vote up vote down
PC Automatic Power-on CircuitPCMay 19, 2024Status-1 vote up vote down
Circuit for interfacing a relay / solenoid to a PC based on a 2N7000 FETPCSep 01, 2024Status-1 vote up vote down
How to construct Garmin GPS receiver interface cablesPCMar 23, 2024Status-1 vote up vote down
Jasmin floppy disk controller schematicsPCSep 13, 2024Status-2 vote up vote down
RS232 - Lowe HF-225 interfacePCNov 21, 2024Status-1 vote up vote down
Serial to parallel converter - connect a large number of digital outputs to a PC parallel portPC Status-1 vote up vote down
PC parallel port eight DC power switch cam driver two unipolar stepper motors, lights etcPC Status-1 vote up vote down
Pic-Plot GPIB to RS-232 converterPC Status1 vote up vote down
Pic-Plot2 GPIB to USB converterPC Status0 vote up vote down
USB to parallel port converter using Cypress CY7C68013A-56PVXCPC Status0 vote up vote down
24 Line Parallel Interface for the PC - old ISA based design (PDF)PCJul 10, 2024Status0 vote up vote down
TTL UART to RS232 level converter using ST232CDRPCJul 03, 2024Status0 vote up vote down
UART - USB Adapter using a MCP2200PCJul 03, 2024Status0 vote up vote down
UART - XPORT Adapter to allow embedded devices to be accessed from an Ethernet networkPCJul 03, 2024Status0 vote up vote down
USB - PLL / DDS - InterfacePCJul 03, 2024Status0 vote up vote down
Device to monitor the power supply voltages of Commodore computers and warn if they are out of specPCMay 01, 2024Status-1 vote up vote down
555 based beeper signals when file finished loading from Commodore computer tape drivePCMay 01, 2024Status0 vote up vote down
Build a USB Powered AA NiMH and NiCd Battery ChargerPCOct 15, 2024Status0 vote up vote down
Make a Dual-Boot IDE CablePCOct 15, 2024Status-1 vote up vote down