video upload by Dylan B.
https://loess-labs.net/inst/modular/a...
Resonant Low-pass Gate based on standard Sallen-Key filter topology, using hand-rolled vactrols and op amps.
Features:
Gnarly resonant feedback
Overdrive
Intermediary to west and east coast sounds
Organic vactrol response
For the vactrols, I used GL5506 photoresistors and standard yellow LEDs. I couldn't find my heat shrink tubing so I just used very snugly-fitting tubing from a lamp cord and hot glue to hold it together.
There can be a lot of variation due to component tolerances, so you may want to experiment with different capacitor values. Specifically the 104 (0.1uF), you could perhaps go a little lower in value with that if you wanted a less squelchy sound.
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