Thomas Henry’s MPS

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Thomas Henry's MPS: Front view
Thomas Henry’s MPS: Front view

This is my take on the Mega Percussion Synthesizer designed by Thomas Henry. With many thanks to Thomas who kindly gave me the permission to publish it here for DIY. I have made two minor changes which I found useful. First I added input buffers to all four sections of the circuitry, because this eliminates the influence of the potentiometer adjustment to each other. And I changed the circuitry around the CV input and the impact/noise switch. The CV input is now added to the impact/noise switch, with a neutral middle setting for the original behavior. The locked mode is left out.

Specs and features

  • Same as the original
  • Runs on +/-15V and +/-12V
  • Power consumption around 35mA each rail

The documentation and the Gerber files for download can be found in my website (link).

Thomas Henry's MPS: Schematic control board
Thomas Henry’s MPS: Schematic control board
Thomas Henry's MPS: Schematic main board
Thomas Henry’s MPS: Schematic main board
Thomas Henry's MPS: Populated control board
Thomas Henry’s MPS: Populated control PCB
Thomas Henry's MPS: Populated main PCB
Thomas Henry’s MPS: Populated main PCB
Thomas Henry's MPS: Back view
Thomas Henry’s MPS: Back view
Thomas Henry's MPS: Side view
Thomas Henry’s MPS: Side view