[sdiy] Unique sounding modules that can't have voltage control?

[Ian Fritz]

Can't you always replace pots with voltage controlled resistors, a la the standard OTA data sheets?


> On Feb 9, 2024, at 1:37 PM, cheater cheater via Synth-diy <synth-diy at synth-diy.org> wrote:
> 
> On Fri, Feb 9, 2024 at 9:23 PM Ingo Debus via Synth-diy
> <synth-diy at synth-diy.org> wrote:
>> 
>> 
>> [electromechanical solution, servo pot]
>> 
>> Am 09.02.2024 um 17:30 schrieb cheater cheater via Synth-diy <synth-diy at synth-diy.org>:
>> 
>> Yep, it's cheating! It's kind of frustrating because again, for the...
>> fifth? sixth? time. We're talking about where a resistive
>> potentiometer is being replaced by an active component. Not servo pot.
>> 
>> 
>> It has to be an active component? Haven’t read that before, maybe I overlooked that.
>> Surely it doesn’t have to be a single component? Replacing a potentiometer with a single component does get tricky…
> 
> no, not single. an active subcircuit made out of multiple active and
> passive components is fine too.
> 
>> How do you define active component? Is a vactrol an active component?
>> If you define an active component as something that amplifies, i. e. uses one signal to control the amount of another signal, then both a servo pot and a vactrol are active components.
> 
> piece of silicon or multiple pieces of it.
> 
> LDRs are fine. but maybe not the greatest due to slew rate. i'd rathe
> that a "C-" as opposed to something that can do audio-rate modulation.
> 
> servo pot is not fine. nothing electromechanical is good here.
> 
> solid state only and passives. or, if the circuit is originally tube
> or magamp or electret based, then magamps and tubes and electrets are
> fine too. but honestly i'd like to stay away from such topics here and
> only focus on circuits that are solid state in the first place and
> we're looking at whether or not they can be modified for CV control.
> 
>> Ingo
>> 
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