Filters don't need to be massively complex to sound good, and it's amazing the sort of noises you can get out of an op-amp and a bunch of passive components. There's an input and output, of course, plus a CV input with an attached attenuator which feeds into a pair of vactrols, which is where the magic happens. With a bit of care, you can get everything from nice filter sweeps all the way up to squonky acid-bass and beyond. These modules have been built up using the component values that I recommend in the BOM for the PCB/panel set. Don't expect super-snappy responses either, because vactrols are doing a lot of the spadework.

In common with all my other modules, this is supplied with a panel made from laser-cut and engraved 3mm black perspex - mounting hardware and a power cable are also supplied

You can hear a quick and dirty sample of the finished article right here:


  • ? mA +12V
  • ? mA -12V
  • ? mA 5V

Available as an assembled Module and as a DIY project.

This Module is currently available.

$51 Price in €
4 HP Filter
submitted Nov 18th 2019, 22:09 by motorhead412 | last Change Nov 20th 2019, 01:14 by motorhead412

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