tVCA: 2HP Roland-inspired single transistor lo-fi VCA - PCB/panel set
This is a PCB/panel set for the tVCA transistor VCA module kit - based on the Roland 808 design, don't expect high fidelity 'cos you won't get it. However, it works really well for percussive sounds due to the clipping introduced by the transistor.
As these panels are fabricated to the same sub-mm tolerances as 'proper' PCBs, you may find it necessary to slightly open out the jack holes with a deburring tool.
An ideal beginners project - you can get the BOM and schematic here: https://bitbucket.org/yorkmodular/tvca-kit/src/master/