> Thanks.  Now I cannot find where I read that (I've read so many web pages
over the last week).  Maybe I dreamed it.  (-:

You are learning so much so fast that it's hard to fugure out what goes
where :-) !
You must be having great fun! :-)

You MAY be confusing this with the square wave applied to an LCD which MUST
be 50% duty cycle. If not 50% then there is a DC components and you get an
elctrolytic cell and the LCD dies rather quickly.

The actuial requirement is "no DC" so you can actually have e4g a 40/60
square wave BUT it would need to be assymerical above and below ground so
mean DC = 0. Using a series capacitor to fed the voltage ensures this.

        RM

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