Analog Envelope Filter?

[falco_femoralis]

A while ago I had an MXR tremolo pedal that had a setting where the tremolo would happen faster the louder you played. Ie if you strum a loud chord and let it ring out, the tremolo would start fast and slow down as the chord decayed in volume. That pedal was digital. Is it possible to do that with an analog circuit?

I see the Chalumeau but there's a lot there I don't understand. I'd like to implement this idea into a univibe where it would take the place of a treadle or second speed footswitch

 

[Aleph Null]

Sure it's possible! The devil is in the details: you'll need an envelope detector, usually a rectifier of some kind; and a voltage controlled resistor, this would be a vacteol, a FET, or possibly a BJT or Mosfet.

Is there a particular circuit you want to add the feature to?

 

[jcpst]

I haven’t built it yet, but I bought a PCB of the VFE Old School from Mad Bean Pedals because it has that feature.

 

[ianmarks]

Last Gasp Arts Labs Ripplet - schematic is over at deadendfx under Sputter.

 

[Mentaltossflycoon]

I just built a defx sputter. You should check that out for sure.

 

[falco_femoralis]

Sure it's possible! The devil is in the details: you'll need an envelope detector, usually a rectifier of some kind; and a voltage controlled resistor, this would be a vacteol, a FET, or possibly a BJT or Mosfet.

Is there a particular circuit you want to add the feature to?

The Pedal PCB Photon Vibe is my goal

Last Gasp Arts Labs Ripplet - schematic is over at deadendfx under Sputter.

I was thinking a tremolo would be a great way to start. I'll check that one out.

 

[Aleph Null]

After a brief look at the schematic, I think you could get envelope-controlled depth to work. Speed would be harder just because it uses a dual gang potentiometer.