Jim Koehler has developed a nice PPM which may interest readers of this forum. He also has a good discussion of the theory of a PPM at his site here:
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http://members.shaw.ca/jark/PPM.html
And, you can find most of the construction details of his PPM on this site:
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http://www.jandspromotions.com/philips2005/Winners/AR1746.htm
He has also published an article on this PPM in the May 2007 issue of Circuit Cellar.
I have not built his PPM, so can't be much assistance with it.
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http://www.thunting.com/smf/index.php/topic,4417.msg28805.html#msg28805
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