When [beerninja] wanted to swap his USB keyboard from one game console to another without mucking about with wires, he asked the Hack A Day forums for some help. [Meseta] (AKA [UAirLtd]) came to the ...

This simple audio multiplexer is basically a low-power USB-controlled relay used to switch audio signals to avoid the need to, instead of headphones, plug speakers into the PC’s soundcard. Some of its ...

In this quick Arduino tutorial I will explain how you can control a relay using the Arduino Board, one 1K and one 10K resistors, 1 BC547 transistor, one 6V or 12V relay, one 1N4007 diode and a 12V fan ...