PC Circuits
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RS232C Level Converter
Isolated Full Duplex RS232C Interface
Ericsson phone to PC serial port interface
PC serial port receiver
Parallel (Printer) Port Interface
RS-232 Connections, and wiring up serial devices
Serial Infrared Remote Controller
RS-232 Protocol Analyser
4-channel 8-bit analog-to-digital converter for PC
Analog Signal Acquisition for PC Printer Port
Barcode scanner
DS1621 PC thermometer
Parallel port servo controller
Null Printer Adapter
Getting power from RS-232 interface
How to get power from PC to your circuits
Powering devices from PC parallel port
Get power out of PC RS-232 port
RS-232 surge protection
PC serial port buffer circuit
Fake Joystick circuit
Simple PC SmartCard reader
Homebuilt RS232 LCD Interface
Interfacing 16x2 character LCD to parallel port
PC interface circuit collections
24-I/O PC digital interface (PDF)
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