There are 128 circuit schematics available in this category. Click here for all circuit diagrams. Last circuit added on Thursday, 30 July 2015.

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CircuitCategoryDate AddedOK?Votes 
Yaesu FT-897 - PC interface (PDF)PC 0
RS-232 line monitor and loopback cablesPCJan 26, 20011
RS232C Level ConverterPCJan 26, 2001-1
PC electrically isolated RS422 interface using SN75176B or MAX485PCJun 20, 20040
PC electrically isolated RS485 interface using MAX487 or SN75176BPCJun 20, 20040
Short circuit protected power supply from PC 12V supplyPCJun 20, 20040
Isolated Full Duplex RS232C InterfacePCJan 26, 20010
RS232 DB-9 switch to flip between two serial portsPCJun 20, 20040
Simple RS232 Level Converter based on a MAX232 including Eagle PCB and schematic filesPCJun 28, 20111
PC-based candle ignitor (parallel port based design)PCDec 07, 20140
PC-Based DC Motor Speed ControllerPCOct 25, 20140
Bell 202 and CCITT V23 Compatible FSK Modem CircuitPCOct 27, 20090
Three Wire RS232 To RS485 ConverterPCJan 08, 20140
PC Audio Signal Generator Using RS232 PortPCOct 03, 20130
Commodore 64 24-bit parallel port interface with 8255PCMar 23, 20030
USB digital I/O extender using a PIC18F14K50PCApr 12, 20140
Transceiver to PC soundblaster interface for digital operating modes (PSK-31, RTTY, SSTV etc)PCOct 07, 20090
Transceiver to PC interface with a hardware DTMF detector and galvanic isolation (PDF)PCOct 07, 20090
PC serial port parastic mode interface for 1-wire DS18S20 and similar 1-wire temperature sensorsPCJun 28, 20110
Small circuit and PCB layout for recording to PC Sound Monitor / Pre-ampPCFeb 26, 20100
Ericsson phone to PC serial port interfacePCNov 29, 20020
Magnetic card reader to PC RS-232 port interface based on a PIC12F675 microPCMay 24, 20100
RS-232 to TTL level translatorPCMay 16, 20100
RS232 to RS485 converter schematic to connect PC to RS485 networkPCApr 09, 20100
RS232 serial to USB converter cable circuit schematicPC 0
Mac to HP48 cable pinoutPCSep 10, 20060
Game boy camera PC serial interfacePCSep 13, 20060
300/1200 baud BAYCOM MODEM (revision and improved)PC 0
HAMCOM (SSTV, RTTY, FAX...) modem using PC-speaker for TXPC 0
PTT and/or soundcard interfacePC 0
PTT and soundcard interface for the TM255/455PC 0
HAMCOM (SSTV, RTTY, FAX...) modem using serial audio for TXPC 0
HAMCOM & SoundCard MODEM using serial- or soundcard audioPC 0
TM-441 9600bps packet modificationPC 0
Using a PC power supply as a benchtop power supplyPC 0
Computer Controlled Frequency Counter/Logic ProbePCSep 01, 20090
Circuits to computerize your room/housePCSep 01, 20090
Simple Parallel (Printer) Port InterfacePCSep 01, 20090
The KD2BD Pacsat ModemPCJul 10, 20020
SWTP PR-40 Printer Interface SchematicsPCSep 10, 20060
A Serial Infrared Remote ControllerPCJan 26, 20010
General purpose ISA interface card for PCPC 0
PC ISA Card Random Number GeneratorPC 0
MIDI cable for Sound Blaster cardsPC 0
PC ISA board containing a Z80 microprocessor (coprocessor card)PC 0
Analog Signal Acquisition for PC Printer PortPCJan 26, 20010
More accurate PC/AT clockPCJan 26, 20010
Getting power from RS-232 interfacePCJan 26, 20010
PC based Frequency MeterPC 0
7 segment rolling display using PCPC 0
SmartCard PC EmulatorPCFeb 21, 20050
Relay interface add-on board for PCPCFeb 21, 20050
8-way relay interface board for PC parallel printer portPCFeb 21, 20050
Stepper motor controller for PC parallel portPCFeb 21, 20050
3-axis stepper motor controller for PC parallel portPCFeb 21, 20050
PC based thermometer based on Dallas DS1621PCFeb 21, 20050
Connect two CD-ROM drives to one soundcardPCJan 26, 20010
Headphone driving circuit for soundcardsPCJan 26, 20010
Get power out of PC parallel portPCJan 26, 20010
Null Printer AdapterPCJan 26, 20010
PC speaker volume control circuitPCJan 26, 20010
How to get power from PC to your circuitsPCJan 26, 20010
RS-232 surge protectionPCJan 26, 20010
Simple RS-232 serial port buffer circuitPCJan 26, 20010
Get power out of PC RS-232 portPCJan 26, 20010
Sound Blaster Microphone PreamplifierPCJan 26, 20010
Sega 3D glasses interface circuit diagramsPCJan 26, 20010
Convert Atari-style joystick to PC joystick portPCJan 26, 20010
Fake Joystick circuitPCJan 26, 20010
Using the joystick port as general purpose inputPCJan 26, 20010
Connect other circuits to PC joystick portPCJan 26, 20010
Build your own iRDA SIR Transceiver (Dongle) using MCP2120PCAug 27, 20030
GPS receiver (Gamin, Eagle etc) to PC interface cablesPCMar 23, 20030
Z80 Computer circuit diagramPCAug 18, 20090
The Great Z80 Computer ProjectPCAug 18, 20090
Ethernet interface for Commodore 64 computerPC 0
i2c-tiny-usb, a simple i2c interface for the usb portPC 0
LCD2USB, cheap open source text LCD interfacePC 0
TiltStick, a motion sensing device (USB interface to accelerometer)PC 0
Building an Infrared Transmitter for Your PCPC 0
FM radio for a PIC (uses TDA7000 IC which is now obsolete)PCSep 08, 20090
Serial servo controller for interfacing hobby servos via RS232 to a PCPC 0
New and Improved Sound Card Packet Interface tested with PSK31 and APRSPCOct 27, 20090
Sanyo 20EZ monitor circuit diagramPCMar 18, 20030
Simple RS232C Level Converter using TransistorsPCJun 19, 20110
Interfacing Alphanumeric LCD to Parallel Port using Visual Basic 6.0PCMay 19, 20150
Interface LTC1298 with Standard Parallel PortPCMay 19, 20150
RS232C level converters based on Maxim MAX232 or Dallas DS275PCMay 19, 20150
Isolated RS422 adapter for PC serial portPCJun 19, 20110
Simple and easy build RS232C-RS485 converterPCJun 19, 20110
PC Power Reboot Circuit for ATX power suppliesPCJun 19, 20110
Isolated Full Duplex RS232C Interface for a PCPCJun 19, 20110
RS232 Expander - Expands PC's COM port from COM1 to COM1/1 and COM1/2. No active partsPCMay 19, 20150
PC-based ISA data acquisition and control boardPCSep 13, 20060
Linux Infra-red Remote Control (LIRC)PCApr 12, 20010
Build your own MARES dive computer IRIS interface for RS232PCOct 04, 20100
Homebuilt RS232 LCD InterfacePCJun 18, 20030
Homemade Serial to Nokia MBus Interface on a PCB, without using Zener diodesPC 0
Machine Independent Parallel InterfacePC 0
PG31 GPS RS232 GPS development boardPC 0
PG31 GPS RS232 USB development boardPC 0
RS232 RS485 USB Converter BoardPC 0
CCD linear image sensor to PC parallel interfacePCJun 20, 20040
ADMS programming Cable for the Yaesu FT50, VX1 and VX5PCMay 07, 20100
Radio Interface Box for the Motorola Radius GP300PCMay 07, 20100
PG4S programming Cable for the Kenwood TM-V7 and TM-G707PCMay 07, 20100
Laptop Computer Serial Port Power BoosterPCApr 12, 20010
SPDIF RCA to (Optical + RCA) AdapterPCMay 07, 20100
Various sound card interfacing circuit diagramsPC 0
Assorted computer interface circuitsPCMar 18, 20030
Apple II/II+/IIe IDE Drive InterfacePCOct 31, 20020
PC based digital thermometer based around a Dallas Semiconductor DS1621PC 0
Simple stepper motor driver for PC parallel portPC 0
MS-DOS EEPROM ProgrammerPCSep 25, 20090
SB-Bus Drivers Introduction and Circuit DiagramsPCSep 25, 20090
RS-232 to TTL cablePCMay 01, 20040
9-pin null modem cablePCJan 26, 20010
PC Automatic Power-on CircuitPCMay 19, 20150
Circuit for interfacing a relay / solenoid to a PC based on a 2N7000 FETPCSep 01, 20090
How to construct Garmin GPS receiver interface cablesPCMar 23, 20030
Jasmin floppy disk controller schematicsPCSep 13, 20060
RS232 - Lowe HF-225 interfacePCNov 21, 20020
Serial to parallel converter - connect a large number of digital outputs to a PC parallel portPC 0
PC parallel port eight DC power switch cam driver two unipolar stepper motors, lights etcPC 0
Pic-Plot GPIB to RS-232 converterPC 0
Pic-Plot2 GPIB to USB converterPC 0
Computer microphonePCJan 26, 20010
24 Line Parallel Interface for the PC - old ISA based design (PDF)PCJul 10, 20150