DJ Delorie wrote: > 1. How do you find out where such a noise is coming from, when > everything is so close together? Neither a stethoscope nor a straw > were helpful. > > Get an electret mic running off a battery on one scope lead
Probe around with other scope lead to see what is in sync with it just to make sure you are looking at the right part of the circuit. You could spend ages looking at that switcher for the OLED and find out that the buzz was a slightly different frequency coming from somewehere else. Next you can get a peizo element and solder some whiskers to it and use that to probe components for the same noise. With contact from the whiskers you maybe able to track it down further than a straw/stethescope could > 2. What kind of components *can* make that kind of noise? > > Anything from inductors and electro caps through to actual copper traces. _______________________________________________ geda-user mailing list geda-user@moria.seul.org http://www.seul.org/cgi-bin/mailman/listinfo/geda-user