Analogue electronic drum pad by Amdek a DIY kit version of the Boss PC-2. I was asked to build one. Everything was fine. except the rubber pads seem to have some kind of mold.

I added a standard tip - guitar DC socket into the back. It originally had an audio jack style connector - which was completely corroded.

Here is a quick video of it hooked upto a practice pad with a Piezo attached to it…. sorry the camera was the wrong way up.