On Fri, 30 Aug 2002, Olin Lathrop wrote:

>As someone else already pointed out, you could use a FET in the right place
>to achieve the same effect.  Another possibility is to pass DC to the rotary
>board and then superimpose a digital data stream on it.  This can supply
>both clock and control information.

There is also the way used in some model trains. The voltage is upped for
a few miliseconds to change a bistable relay. It could be used by lowering
the voltage, f.ex. by having two antiseries zeners shorted by a NC button
for ac.

Peter

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