Hobbyist battery SMPS circuit

I've been poking around and I've found a few good links (I can share
if you ask) but I'm a bit overloaded with information and could use
a little help.

What I'm looking for is a SMPS for use with batteries (AA). Does
anyone have any good sites for simple but efficient SMPS? Also
are there relays that can be activated by 3V?

Thanks

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Linux Home Automation         Neil Cherry       ncherry@...
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