On Thu, 13 Sep 2007 11:38:57 -0400 DJ Delorie <[EMAIL PROTECTED]> wrote:
> > Did you cheap out on the inductor? > > Not that I'm aware of. I used these: By far the most probable cause is the inductor. I've made quite a few switchers, and several of them caused problems. I'm not so preoccupied with the noise by itself, but more by the possibility this may cause chafing and shorts on the long haul. The buzzing may appear only if a certain load (lower _or_ higher) is placed on the supply, as the switcher frequency passes through some resonance in the windings (even they should ideally be impregated). Even 'fixed frequency' switchers vary a little... John _______________________________________________ geda-user mailing list geda-user@moria.seul.org http://www.seul.org/cgi-bin/mailman/listinfo/geda-user
