[sdiy] Resolution of analogue potentiometers?

Magnus Danielson magnus at rubidium.dyndns.org
Wed Feb 13 09:12:40 CET 2013

On 02/13/2013 12:53 AM, Michael Zacherl wrote:
> on some VCOs I have about 15 octaves on a 300° pot.
> That's not very practical in many situations, but doable.
> Often I just touch the front of the knob to move it for fine adjustment.
> (I do have additional 'fine' pots)

This is a case where the resolution of the pot is not the real limit, 
but the range of the pot. A small fine-tune pot makes sense even if you 
have sufficient resolution on the coarse tuning, since it becomes hard 
to do fine-tuning anyway.

Using ten-turn pots or gears helps with bringing it to one knob, but 
sometimes you turn many turns to get where you want. The two-pot 
arrangement make sense in this regard.

So, I don't think it's the actual resolution of the pot which is the 
limit, but rather if it is a good control interface achieving both speed 
of adjustment and fine-grained control.


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