On Wed, Sep 19, 2007 at 01:30:33PM -0400, DJ Delorie wrote: > > > The PCB for my alarm clock buzzes. > > If I replace just the +12v cap with a 22u elec, the +7 cap still > buzzes. I suspect the elec alone can't react fast enough to get rid > of the ripple.
Or is it reacting too quickly? Some power supplies need a minimum ESR so that the output cap acts as an RC filter. Your electrolytic cap is almost certainly higher ESR than what you had in there. Try air-wiring in your original cap with 1-5R and see what happens. -- Ben Jackson AD7GD <[EMAIL PROTECTED]> http://www.ben.com/ _______________________________________________ geda-user mailing list geda-user@moria.seul.org http://www.seul.org/cgi-bin/mailman/listinfo/geda-user
