> (re stepper motor for a digital knob thread)
> I've just been playing with a 12v unipolar "surplus"
> stepper from an old 5.25 disk drive. Connected it to
> the CRO and used a clothes peg for an accurate "knob".

Well, my questions are:

A) how small can one of these be (in comparison to a rotary encoder)?
B) how cheaply can one be had (in comparison to a rotary encoder)?

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