◊ PCB Documentation


194 Fixed Bandpass Filter

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.

PCBs are $15.00 @ — ORDER HERE

Bill of Materials (value/qty)

  • Resistors
    • 100k x5
    • 10k x10
    • 15k x6
    • 1k5 x5
    • 220r x4
    • 2k2 x1
    • 3k3 x2
    • 4k7 x3
    • 68k x4
  • Capacitors
    • 100uf x2
    • 10uf x1
    • 1uf x3
    • 10n x3
    • 220n x1
    • 22n x1
    • 47n x3
    • 2n2 x2
    • 4n7 x1
    • 910pf x1 (mouser #598-CD15FA911JO3F)
  • Transistors
    • BC550 x7
    • BC560 x4
  • Misc.
    • .156" power header x1
    • ferrite bead x1
    • in/out jacks x5
    • 100k pot (optional input atten.) x1

Notice

    The text, images, graphics, and other content of this website related to Don Buchla's legacy synthesizer designs is made available under the Fair Use Doctrine of the US Copyright Office. Fair Use limits the use of this information to personal, educational, and scholarly purposes (including right-to-repair, where applicable). It may not be used as the basis of commercial or for-profit works. Our Printed Circuit Boards may be purchased and assembled for your personal or educational use, but may not be manufactured and sold as "Buchla" products.