> You can fake an A/D (not really fake) by using two resistors, two diodes,
> and a cap.
> A single port pin connects to the two diodes.
> The diodes each connect to a resistor (one is your pot)
> The resistors both connect to the cap.  Use a moderate size, like 10uF.
>
> Orient the diodes so that charge current goes through one resistor, and
> discharge through the other.
> Now, you can compare charge time vs discharge time, and get the ratio.
>
> You'll be flipping banks a lot, but it works.

I'll have to play with that.  Being very inexperienced with this kind of
thing I tend to "over engineer".  This is the kind of thing that can mean
allot, especially when a customer will want to mass produce something.  From
looking at TV schematics I have seen things that I would never have thought
of in a million years.  Ways to avoid using one more transistor, or ways to
get a voltage source from the wildest concoction (TV designers are great at
this).  And I understand that if you can save ten cents, fifty thousand
times over, it can be that (oh so important) make or break difference.  Good
to here from you Dave.  Thanks again for the advice, I need all the help I
can get.  How's the HamHud III going???

michael

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