Schematics
Power Amplifier
Preamplifier
Audio mixer
Audio Equalizer
DC Protection
Headphone Amplifier
Vu Meter
Tube amplifier
Loudspeakers Active crossover
Audio Filter
Audio misc
Auto - car
FM transmitter
LED
Alarm
Power Supply
Motor control
Robot
Timer generator oscilator
Computer
Microcontroller programmer PIC AT
Digital
Light controller
Laser
RF transmitter receiver
IR infrared
Medicine
Meter Tester
Video
Switch control
Solar
RC modeling
Musical instruments
Miscellaneous
Game
Data acquisition
Telephone
WEB thermometer
Visual Basic (DLL's) and PC interfacing
USB2LCD II project
USB to RS232 Dongle
USB to RS232 converter
USB interface for parallel LCDs
USB designer links
Universeller AD-Wandler auf Basis des TLC 549
TTL to/from rs232 signal conversion
Simple circuit and program to show how to use PC parallel port output capabilities
Serial to parallel converter
Serial port controlled IR transmitter
Serial Port A/D-converter
Serial Infrared remote controller
RS232C level converter
RS232 to RS485 Converter
RS232 to IrDA converter
RS232 - RS485 - USB interface circuits
RS 232 laser transceiver
Remote control of computer
Remote control for Windows
Power from parallel port
Power for your circuits from RS-232 signal lines
PC-based DC motor speed control
PC thermometer
PC serial port receiver
PC printer port relay board
PC ISA bus Analog-to-Digital, Digital-to-Analog card
PC IR remote control
Parallel port servo controller
Parallel port relay interface
Parallel PC Interface
Null printer adapter
Multi Wire Cable Tester
LPTCAP parallel port print capture system
Logic analyzer using the PC's parallel port
Lightning flash counter
Isolated full duplex RS232C interface
Interfacing relays and transistors
Interfacing Digital-to-Analog converters
Infrared remote control of your PC
How to use your RS232 or IRDA port for Remote Control
How to get power from PC to your circuits
Fan speed temperature regulator
DS1621 to a PIC16F84 Digital Thermometer
DS1621 to a Basic Stamp Thermometer circuit
DS1621 PC thermometer
DS1620 Programming Tool
DMX 512 printerport interface page
DC motor drive controller
DB-9 connector to DB-25 (both RS-232) Useful tools for RS-232 interfacing
CPU Clock Indicator
Controlling LEDs (Light Emiting Diodes) with Parallel Port
Centronics port D/A converters and low-pass filter
Audio-video switch
