I realise that I have not made one thing clear enough - it's in the heading
but not (strangely) spelt out as clearly as could be in the text. The object
is LOWEST COST and also a complete "analog (or equivalent input) to PWM
output" circuit. There have been many interesting ideas, but quite a few
have no prospect of being lowest cost and some address only part of the
requirement. I find ALL circuit suggestions interesting so none of this is
wasted on me, but the unspecified (as yet unthought of) virtual (aka
non-existent :-) ) prize is for a complete lowest cost solution.



        Russell McMahon

--
http://www.piclist.com hint: To leave the PICList
mailto:piclist-unsubscribe-request@mitvma.mit.edu