Thanks for the considered reply Mike. I'm sure I saw a circuit once with a little180uH axial inductor that claimed the noise was ear-splitting. I've a few inductors around that so I'll experiment with them and frequency, see if I can find the "ouch" note -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist