Combined power supply / bus board for Eurorack with 8 power headers.

Build Document


Microbus PCB is a variant of FC Power, additionally integrating 8 power headers onto a slightly larger PCB. Powered by a 12V/1000mA  AC wallwart and provides ~500mA at +/-12V DC, ~100mA at 5V DC (optional). Dead simple to build and based on easily sourced and inexpensive parts. You can also choose to built it as a +/-15V supply with minor component changes.)

PLEASE NOTE: FC POWER works from a 12V AC wallwart. FC Power will not work from a 12V DC wallwart.  If only one half of your Microbus is working, the likelyhood is that you are using a 12V DC wallwart instead of a 12V AC wallwart.

Can be easily expanded to include more power headers with the Double Decker or Expandobus.

Dimensions of the PCB are 110mm x 81mm. Height of a completed unit is 30mm.

The perfect solution for:

  • Small – medium sized cases
  • Small, self contained synth projects
  • Skiffs cases

Product Specifications


110mm x 81mm