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
You can find detailed descriptions of Thomas Henry's Mega Percussion Synthesizer on the net. My changes are adding input buffers to all four sections off the MPS to make the adjustment of the potentiometers independent from each other. This is done with IC1 on the control board. And the mixing off the CV input with noise/impact. This is done with IC2C/D on the control board.
- Due to their height you have to mount some of the capacitors from the backside on the main board. See picturs. Or use longer standoffs.
DownloadThomas Henry's MPS control board documentation download
Thomas Henry's MPS control board Gerber files download
Thomas Henry's MPS main board documentation download
Thomas Henry's MPS main board Gerber files download
Thomas Henry's MPS *.fpd file