----- Original Message -----
From: "Hazelwood Lyle" <LHazelwood@MFGNC.COM>
> Try looking for "Rotary Encoder".
> It's nice that they can be had with no upper/lower limit.
> This is especially good for adjusting levels, as you can
> read them as increment/decrement instead
> of an absolute level setting.
>
> Most give a 2-bit output, with a signal pattern
> that matches an incremental encoder. Each
> signal is a square wave with 50% duty cycle,
> and the two signals are 90 degrees out of phase.
>
> Both mechanical and optical versions can be
> had from Digi-Key.

The optical ones are insanely expensive, though.

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