PC related schematics

  • I2C printer port adaptor
  • RS232C Level Converter
  • PC electrically isolated RS422 interface using SN75176B or MAX485
  • PC electrically isolated RS485 interface using MAX487 or SN75176B
  • Short circuit protected power supply from PC 12V supply
  • Isolated Full Duplex RS232C Interface
  • RS232 DB-9 switch to flip between two serial ports
  • DB-9 Connector to DB-25 (both RS-232)
  • Mac Serial Port (RS-422 DIN-8) to RS-232 DB-25
  • Modem Rockwell RCV336/ACF model V1433VQR ext.
  • Genius Mouse schematics
  • EEPROM programmer
  • Commodore 64 24-bit parallel port interface with 8255
  • Sound Card Interface with Tone Keyer
  • Ericsson phone to PC serial port interface
  • PC serial port receiver
  • Parallel port relay interface
  • ISA 48 I/O digital card
  • Jupiter card programmer
  • USB to RS232 Dongle
  • Parallel (Printer) Port Interface
  • RS-232 line monitor and loopback cables
  • The KD2BD Pacsat Modem
  • A Serial Infrared Remote Controller
  • PC Serial and Parallel Port Software and Interfaces
  • Interfacing 16x2 character :LCD to parallel port
  • RS-232 Protocol Analyser
  • Interface cable for Casio QV-200 digital camera
  • Radio clock for PC's
  • A PC-Based LowFER Frequency Synthesizer
  • Power from RS-232 port
  • PCI to ISA converter
  • WatchDog for ISA Bus
  • 4-channel 8-bit analog-to-digital converter for PC
  • Printer port ADC
  • Parallel port ADC based on MAX147
  • Analog Signal Acquisition for PC Printer Port
  • More accurate PC/AT clock
  • Getting power from RS-232 interface
  • Barcode scanner
  • SmartCard PC Emulator
  • Relay interface add-on board for PC
  • 8-way relay interface board for PC parallel printer port
  • Stepper motor controller for PC parallel port
  • 3-axis stepper motor controller for PC parallel port
  • PC based thermometer based on Dallas DS1621
  • Simple PC thermometer for serial port but using R/C network for measurement
  • Dallas DS1620 based USB Digital Thermometer
  • PC thermometer using PC game (joystick) port
  • iRDA interface for motherboard using Vishay TFDS4500
  • LCD2LPT with LIRC (LCD to LPT printer port) interface
  • FM radio with PC parallel port interface
  • Build your own iRDA SIR Transceiver (Dongle) using MCP2120
  • PC thermometer
  • Dive computer interface
  • Parallel port servo controller
  • GPS receiver (Gamin, Eagle etc) to PC interface cables
  • Connect two CD-ROM drives to one soundcard
  • Headphone driving circuit for soundcards
  • Get power out of PC parallel port
  • Null Printer Adapter
  • PC speaker volume control circuit
  • How to get power from PC to your circuits
  • RS-232 surge protection
  • Simple RS-232 serial port buffer circuit
  • Get power out of PC RS-232 port
  • Sound Blaster Microphone Preamplifier
  • Sega 3D glass interfacing circuits
  • Convert Atari-style joystick to PC joystick port
  • Fake Joystick circuit
  • Using the joystick port as general purpose input
  • Connect other circuits to PC joystick port
  • Schematic of a standard PC joystick
  • Simple PC SmartCard reader
  • Fax to modem interface
  • Analog to Digital Conversion (ADC) and Communicating with a PC
  • Temperature sensor for PC
  • PC interface for point controller
  • Linux Infra-red Remote Control (LIRC)
  • Homebuilt RS232 LCD Interface
  • Compter microphone
  • CCD linear image sensor to PC parallel interface
  • Laptop Computer Serial Port Power Booster
  • Assorted computer interface circuits
  • HamComm Interface
  • Apple II/II+/IIe IDE Drive Interface
  • Basic Stamp I & PC Relay Controller
  • RS-232 to TTL cable
  • Hi-Fi PC Speaker System
  • How to construct Garmin GPS receiver interface cables
  • iRDA printer adapter
  • 160 Baud ALDL Hardware Interface
  • 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
  • iLINK Interface
  • Digital Signals Decoding Interfaces
  • 9-pin null modem cable
  • RS232 - Lowe HF-225 interface
  • RS232 to IrDA convertor using Vishay TOIM3232
  • Interfacing PC sound card to SSB rig
  • Supply Derives Power From 3-Wire RS-232 Port
  • 24-line PC digital interface (PDF)