The Mini-Bus is a compact, expandable and low noise power solution for Buchla systems. Available as a PCB you can build or, direct from toppobrillo, as an assembled board with all PCB mount parts installed.   (Some assembly for installation required. see build guide)

  • +/- 15V @ 1A; +5V @ up to 1A; +12V
  • Supports 200e preset bus
  • Noisy / Quiet ground-scheme implemented as per Buchla’s 200e cases
  • Low Noise: <5mVpp (2mV RMS) r/n @ 75% load
  • Can be used passive or active. Extendable to 8 connects with Bus Xtnder kit
  • Easy to source standard footprint DC/DC converter available from several manufacturers
  • Accepts Molex or Faston blade style headers
  • 2oz copper , lead-free w matte-black mask
  • Measures ~165mm x 76mm
  • Fits existing hole pattern from various case makers
  • Requires external 12V AC/DC brick (see BOM for recommended parts)

Full documentation is available from

Boards can be purchased here, or direct from toppobrillo here.

Front side of PCB –


Rear side of PCB –


Example of populated board –


Notes –

  • PCBs are supplied bare (other components must be sourced)
  • No warrenty is given nor implied