Am 12.10.2012 00:22, schrieb Bob Blick: > The original microphone output was probably about 10 millivolts with > normal voice levels. That should certainly get you in the range of > operation. Thanks, I'll use that value. > > Shouldn't you run the transformer in the other direction (6:1)? Goal is to decrease the source's voltage. Best --=20 http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .