UM-TSS - CMOS Drumsynth
This is a circuit by Jacob Watters (check the original block post), I just did the PCB-layout. In agreement with Jacob this is released here as open hardware. Hopefully you enjoy the project and maybe you can even improve it!
The circuit is based around a couple of 40106 hex-schmitt triggers. I removed the divider from Jacobs layout to make every sound triggerable by itself. The trigger ins are protected by clamping diodes.
PCB v1 has a couple of bugs (mainly because I used the wrong revision of Jacobs circuit duh). But the PCB can certainly be used to build a running circuit. Check the build guide for PCB rev. 1 here and the BOM
I already fixed most of the issued in the schematics for version 2. I hope that together we can make a second version of the PCB that runs more smooth!