Pondering how to choose SimpleP48 resistors, it suddenly occurred to me that we can use the techniques in FETbias.doc so I've updated that in my Files/Ricardo directory.
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It's so obvious with hindsight that I beg yus guy's pardon for my stupidity.? Measuring at 9V is perfect cos we want 5 - 10V
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Mea culpa, mea culpa, mea maxima culpa.