194 Bandpass Filter

One input, four fixed-frequency filtered outputs.   

All discrete transistor bandpass filter (not voltage controlled), based on the Buchla 194 circuit. One audio input, 4 filtered outputs: LP <200hz, BP 200-900hz, BP 900hz-4khz, and HP > 4khz. In conjunction w/ a 4-channel mixer, can be used as a comb filter or graphic EQ.

Bill of materials and build notes are available here

Pcbs and panels are in the shop here, and here (respectivly).

Alternativly, if you are in the United States, you may like to order pcbs direct from fluxmonkey.

Front side of PCB –


Rear side of PCB –


Example of compatible panels –


Example of completed module –


Notes –

  • No warrenty is given nor implied