Design files for remote controlling an old Onkyo HiFi receiver. Uses a relay, opto-couplers and a 
Raspberry Pi.

<img src="https://git.lukasschwarz.org/lukas/ampcontroller/media/branch/master/relay2.jpg" width="40%" alt="Picture of a transistor and relay on a PCB, switching power to an amplifier.">


[Link to the more detailed article](https://lukasschwarz.org/projects/amp-controller/)