Re: gEDA-user: buzzing board

[DJ Delorie <dj@xxxxxxxxxxx>]

> Ceramic caps on a switching power supply can have a pizeo eletric  
> effect.  Try poscaps or a tant.

The switcher caps are tantalum.  There are also two electrolytic bulk
caps, one on each side of the switcher.

Probably the best view of these is here:
http://www.delorie.com/electronics/alarmclock/20070908-board.html

The OLED's LDO is in the far upper right in that photo.

For the purposes of solving this problem, I put the design files here:
http://www.delorie.com/electronics/alarmclock/20070913-design.zip

> Did you cheap out on the inductor?

Not that I'm aware of.  I used these:

495-2003-1-ND   EPCOS B82464A4104K (100uH)
PCD2089CT-ND    Panasonic ELL-5PM3R0N (3uH)


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