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I am currently working on a project to create an amplifier which can use both physical and digital inputs to change the resistance of a potentiometer.

Is this possible without using sliders?

I know this sounds like a pretty odd question but I'm not sure how else I could do it as all the Pots I've found are either Digital or Analogue.

Thanks for your time.

SamGibson
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Ben Robinson
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2 Answers2

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Motorized potentiometers are a thing, although they are not used much on new equipment.

Another option is to use an encoder to detect knob rotation and use that to update a digital pot.

Jasen Слава Україні
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Welcome Ben.

Maybe what you are looking for is a programmable gain amplifier (PGA) like this one (sorry the schematic looks quite old). Wikipedia page on programmable gain amplifiers gives also two links to integrated circuits. There is also a discussion on PGA here.

The gain depends on a binary word that could be generated:

  • either directly by your digital system
  • or from a physical slider and an analog to digital converter (ADC)

The choice between the two input is up to you.

Charles JOUBERT
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  • Hi Charles, This sounds like a pretty neat Idea I'll have a look at this when i research Jasen's comment above. Thanks again Ben – Ben Robinson Dec 09 '18 at 00:32