RJ45 Network card to IR communication
This system, composed of two opto-insulated circuits, allows the data transmission per infra-red network device between two computers. For example, someone can transfer his files starting from his desktop computer to his laptop computer without using any cable.
A Passive Ethernet Hub
Make your own Half Duplex Ethernet hub using several diodes and nothing more.
R5000 Computer Interface
This is circuit diagram of a fully isolated interface allowing computer control of the Trio/Kenwood R5000 receiver.
This circuit is adapter for PC which enables you to use electret microphones. It's an audio amplifier made of two BC547C.
VGA to TV Scart
This is a circuit converter from VGA in TV SCART connection