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!
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README.md

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

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

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

PCB v2

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!

Case

I created a case which can be fabbed by a lasercutter. The SVG is available in the repo. The plans are for 3mm material! Here is an image of the first finished prototype (3mm colored HDF): UM-TSS first prototype