gEDA-user: Alarm clocks and switching regulators

[Randall Nortman <geda-lists@xxxxxxxxxxxxxxx>]

A few months ago I posted some questions about switching regulator
design, and got quite a lot of useful info.  One of the things briefly
discussed was using a low-ESR ceramic on the input to the switcher to
handle switching frequency ripple, and then big bulk electrolytics to
handle 120Hz ripple from the rectifier, but with an inductor or choke
between the ceramic and electrolytics to protect the bulk capacitors
from the switching frequency ripple (which might age them
prematurely).

DJ -- I notice from looking at your alarm clock boards that you seem
to have tried something like this.  Would you care to share your
approach and results?  I'd greatly appreciate it.  Looks like you have
a diode in there too -- for preventing resonance?

Thanks,

-- 
Randall


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