Computer / PC related Schematics

160 Baud ALDL Hardware Interface
24-line PC digital interface (PDF)
3-axis stepper motor controller for PC parallel port
8-bit Parallel Port Analog to Digital Converter - Cheap Temperature Sensing with 0.5°C Precision, No Microcontroller Needed!
8-way relay interface board for PC parallel printer port
9-pin null modem cable
A PC-Based LowFER Frequency Synthesizer
A Serial Infrared Remote Controller
Analog Signal Acquisition for PC Printer Port
Analog to Digital Conversion (ADC) and Communicating with a PC
Apple II/II+/IIe IDE Drive Interface
Assorted computer interface circuits
AT PC Power Supply 1
AT PC Power Supply 2
AT PC Power Supply 3
AT PC Power Supply 4
AT PC Power Supply 5
Barcode scanner
Basic Stamp I & PC Relay Controller
Build your own iRDA SIR Transceiver (Dongle) using MCP2120
CCD linear image sensor to PC parallel interface
Commodore 64 24-bit parallel port interface with 8255
Compter microphone
Connect other circuits to PC joystick port
Connect two CD-ROM drives to one soundcard
Convert Atari-style joystick to PC joystick port
Dallas DS1620 based USB Digital Thermometer
DB-9 Connector to DB-25 (both RS-232)
Digital Signals Decoding Interfaces
Dive computer interface
EEPROM programmer
Ericsson phone to PC serial port interface
Fake Joystick circuit
Fax to modem interface
FM radio with PC parallel port interface
Genius Mouse schematics
Get power out of PC parallel port
Get power out of PC RS-232 port
Getting power from RS-232 interface
GPS receiver (Gamin, Eagle etc) to PC interface cables
HamComm Interface
Headphone driving circuit for soundcards
Hi-Fi PC Speaker System
Homebuilt RS232 LCD Interface
How to construct Garmin GPS receiver interface cables
How to get power from PC to your circuits
iLINK Interface
Interface cable for Casio QV-200 digital camera
Interfacing 16x2 character :LCD to parallel port
Interfacing PC sound card to SSB rig
iRDA interface for motherboard using Vishay TFDS4500
iRDA printer adapter
ISA 48 I/O digital card
Isolated Full Duplex RS232C Interface
Jupiter card programmer
Laptop Computer Serial Port Power Booster
LCD2LPT with LIRC (LCD to LPT printer port) interface
Linux Infra-red Remote Control (LIRC)
Mac Serial Port (RS-422 DIN-8) to RS-232 DB-25
Modem Rockwell RCV336/ACF model V1433VQR ext.
More accurate PC/AT clock
Null Printer Adapter
Parallel (Printer) Port Interface
Parallel port ADC based on MAX147
Parallel port relay interface
Parallel port servo controller
PC based thermometer based on Dallas DS1621
PC electrically isolated RS422 interface using SN75176B or MAX485
PC electrically isolated RS485 interface using MAX487 or SN75176B
PC interface for point controller
PC Serial and Parallel Port Software and Interfaces
PC serial port receiver
PC speaker volume control circuit
PC thermometer
PC thermometer using PC game (joystick) port
PCI to ISA converter
Power from RS-232 port
Printer port ADC
Radio clock for PC's
Relay interface add-on board for PC
RS232 - Lowe HF-225 interface
RS232 DB-9 switch to flip between two serial ports
RS-232 line monitor and loopback cables
RS-232 Protocol Analyser
RS-232 surge protection
RS232 to IrDA convertor using Vishay TOIM3232
RS-232 to TTL cable
RS232C Level Converter
Schematic of a standard PC joystick
Sega 3D glass interfacing circuits
Short circuit protected power supply from PC 12V supply
Simple PC SmartCard reader
Simple PC thermometer for serial port but using R/C network for measurement
Simple RS-232 serial port buffer circuit
SmartCard PC Emulator
Sound Blaster Microphone Preamplifier
Sound Card Interface with Tone Keyer
Stepper motor controller for PC parallel port
Supply Derives Power From 3-Wire RS-232 Port
Temperature sensor for PC
The KD2BD Pacsat Modem
USB to RS232 Dongle
Using the joystick port as general purpose input
WatchDog for ISA Bus

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