[sdiy] Using dual taper (4 pin) pots as encoders ?

[Benjamin Tremblay]

Hi, another MCU question. 
I have noticed many synth manufacturers have used 10K 4-pin dual potentiometers as “encoders”. I’m assuming that these are feeding a multiplexed ADC.
My question is, what is the secret sauce? Are both pot tracks wired differentially to reduce noise? Does this indeed go into an ADC or is this some clever way to approximate a rotary encoder but have the smooth motion of a pot?

If using a 4-pin potentiometer is a way of achieving a more stable and reliable mass-production of control knobs, I’m very interested.

Thanks,
Ben


Benjamin Tremblay
btremblay at me.com
Carlisle, MA 01741








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