Exactly. That's the kind of problem I'm unlikely to be able to pickup unless I have the right gear. Maybe I just need to buy. Anything cool for sale Jesse? :) Josh -- A common mistake that people make when trying to design something completely foolproof is to underestimate the ingenuity of complete fools. -Douglas Adams On 9/2/05, Jesse Lackey wrote: > Humm, I think Josh is talking about a mic pre. These are beasts, and > get into all kinds of squirrleyness. I'm working on one now, and just > discovered where a 490hz (and all harmonics thereof) noise spike in the > FFT was coming from: the current used when blinking the "heartbeat" LED > was inducing noise at -110db from the test signal. (this preamp has > digital control, and therefore has a PIC...) -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist