take your 3.3 volt bench supply and bypass the 3.3v switcher. i have heard others suggest this i think in the thread. if the noise continues you know it is another source.
Steve On Sep 13, 2007, at 11:58 AM, John Coppens wrote: > 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 _______________________________________________ geda-user mailing list geda-user@moria.seul.org http://www.seul.org/cgi-bin/mailman/listinfo/geda-user