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 when playing bitcoin casino Coinslotty. 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