I added two new knobs to my awesome Bontempi toy drum machine.

The first time I modified this toy I was able to found only the pitch resistor. When I tried do add other bends I fried a fuse-resistor and I had to go to a TV specialist to repair it! (I did not know nothing about the existence of fuse-resistors at the time).
After this bad experience I added some contact to link it with arduino.

The first time I modified this toy I was able to found only the pitch resistor. When I tried do add other bends I fried a fuse-resistor and I had to go to a TV specialist to repair it! (I did not know nothing about the existence of fuse-resistors at the time).
After this bad experience I added some contact to link it with arduino.