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Re: one potentiometer dividing multiple signals

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On 18/03/2026 16:25, Christopher Howard wrote:
> antispam@fricas.org (Waldek Hebisch) writes:
> 
>> Two potential ideas:
>> - build a bunch of dividers based on termistors.  A single potentimeter
>>    can provide control signal to a heater heating the whole assembly.
>> - similar idea but using fotoresistors and a light bulb.
>>
> 
> I'm nervous about burning the bench down with the thermistor approach.
> But the photoresistor idea sounds appealing, as being a rather simple
> approach, that could be done with a cool LED. What approach would you
> suggest as far as having output voltage correspond to change in
> photoresistor resistance? Like, have the photoresistor pull input signal
> to ground? Or have an op amp with negative feedback resistor on the
> output side?

A summing amplifier is probably what you want to use and combine all the 
terms with the same coefficient using that *before* the potentiometer.

If you provide a netlist or specimen differential equation then we could 
sketch out how to do this in ASCII art or another netlist.
> 
>> Or you can go half way to digital and use pulse with modulation.
>> Namely, one potemeter can control duty cycle of a generator.
>> Such generator can control several analog mutiplexers.  Filtering
>> signal after the multiplexer you get input signal time duty cycle
>> of the generator.
> 
> I few folks have mentioned variants of this idea. It sounds a little
> more complicated than I would prefer, but I'm keeping it in the back of
> my mind.

Thermistors and LDRs tend to be somewhat non-linear and getting some 
that will track well is nigh on impossible. I have used them once in a 
theramin where isolating the RF side from the audio was critical.

Dual gang pots are fairly common for stereo audio anything beyond that 
is specialist stuff.


-- 
Martin Brown

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one potentiometer dividing multiple signals Christopher Howard <christopher@librehacker.com> - 2026-03-16 07:21 -0800
  Re: one potentiometer dividing multiple signals Martin Brown <'''newspam'''@nonad.co.uk> - 2026-03-16 15:45 +0000
  Re: one potentiometer dividing multiple signals "Edward Rawde" <invalid@invalid.invalid> - 2026-03-16 11:50 -0400
  Re: one potentiometer dividing multiple signals john larkin <jl@glen--canyon.com> - 2026-03-16 09:42 -0700
  Re: one potentiometer dividing multiple signals Don Y <blockedofcourse@foo.invalid> - 2026-03-16 09:54 -0700
  Re: one potentiometer dividing multiple signals liz@poppyrecords.invalid.invalid (Liz Tuddenham) - 2026-03-16 20:03 +0000
    Re: one potentiometer dividing multiple signals liz@poppyrecords.invalid.invalid (Liz Tuddenham) - 2026-03-19 10:01 +0000
  Re: one potentiometer dividing multiple signals antispam@fricas.org (Waldek Hebisch) - 2026-03-17 21:28 +0000
    Re: one potentiometer dividing multiple signals Christopher Howard <christopher@librehacker.com> - 2026-03-18 08:25 -0800
      Re: one potentiometer dividing multiple signals John R Walliker <jrwalliker@gmail.com> - 2026-03-18 16:34 +0000
      Re: one potentiometer dividing multiple signals Martin Brown <'''newspam'''@nonad.co.uk> - 2026-03-19 12:42 +0000
        Re: one potentiometer dividing multiple signals Christopher Howard <christopher@librehacker.com> - 2026-03-19 11:51 -0800
          Re: one potentiometer dividing multiple signals john larkin <jl@glen--canyon.com> - 2026-03-19 13:16 -0700
          Re: one potentiometer dividing multiple signals liz@poppyrecords.invalid.invalid (Liz Tuddenham) - 2026-03-19 22:18 +0000
          Re: one potentiometer dividing multiple signals Jasen Betts <usenet@revmaps.no-ip.org> - 2026-03-20 07:29 +0000
          Re: one potentiometer dividing multiple signals liz@poppyrecords.invalid.invalid (Liz Tuddenham) - 2026-03-20 09:05 +0000
      Re: one potentiometer dividing multiple signals Jasen Betts <usenet@revmaps.no-ip.org> - 2026-03-20 07:25 +0000
        Re: one potentiometer dividing multiple signals liz@poppyrecords.invalid.invalid (Liz Tuddenham) - 2026-03-20 09:05 +0000
  Re: one potentiometer dividing multiple signals someone <cffbf4deb9142bce48974efc0e64dede@example.com> - 2026-03-17 22:30 +0000
  Re: one potentiometer dividing multiple signals liz@poppyrecords.invalid.invalid (Liz Tuddenham) - 2026-03-19 18:44 +0000
  Re: one potentiometer dividing multiple signals Jasen Betts <usenet@revmaps.no-ip.org> - 2026-03-20 07:12 +0000
  Re: one potentiometer dividing multiple signals john larkin <jl@glen--canyon.com> - 2026-03-20 09:08 -0700
    Re: one potentiometer dividing multiple signals Ross Finlayson <ross.a.finlayson@gmail.com> - 2026-03-20 11:52 -0700
    Re: one potentiometer dividing multiple signals Christopher Howard <christopher@librehacker.com> - 2026-03-23 09:09 -0800
      Re: one potentiometer dividing multiple signals piglet <erichpwagner@hotmail.com> - 2026-03-24 08:48 +0000

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