On Thu, May 5, 2011 at 3:35 AM, Richard Prosser wrote= : > My guess would be a power supply component. Either an inductor, or a > capacitor. I recently fixed background buzz in a product by changing a > ceramic power supply cap to a film type. The ceramic cap was vibrating > and this was being picked up bu the microphone and degrading the snr. > I have seen this sort of thing in inductors more often however. > > You can probably locate the source by using a short length of plastic > tube. Sickk one end against your ear and move the other around the > likely components. I'll go get a straw. time for a late night snack at Mickey D's. --=20 http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .