Sound samples from the filter that I etched on a PCB (Very percussive) 

From the my last video that I uploaded, I was not able to show the filter from the PCB that I etched working. That is because 2 legs of one of the transistors were touching. More specifically their pads on the PCB. Anyways, I sorted that out and now the filter is working. The original filter from Yusynth is here if you want to check it out
yusynth.net/Modular/EN/STEINERVCF/index-v2.html

Наука