[sdiy] OTA to replace variable resistor

René Schmitz synth at schmitzbits.de
Fri May 1 13:04:12 CEST 2020


On 30.04.2020 23:56, Chris McDowell wrote:
> Hah, wow. I have never seen the datasheet "voltage-controlled resistor" 
> used! I admit I've never even gave it much thought. When I was new to 
> all of this, and asked the community "hey, how do I make an OTA work 
> like a voltage controlled resistor" the response was "well you can't, 
> figure out how to need a VCA instead." wild. It works really well in the 
> this context.

You can also think of this as a 1 pole lowpass filter. The input being 
0v. (if you make the input some positive voltage, you can get an attack 
portion too.)
  Best,
  René

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