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I am more concerned with reducing noise than with extending battery life - I plan on designing the thing to be flexible for power needs (one-shot cells, rechargables, wall wart.)

The idea being...

I am more concerned with reducing noise than with extending battery life - I plan on designing the thing to be flexible for power needs (one-shot cells, rechargables, wall wart.)

The idea being...

But NOT the typical 12VDC units. I'd like to find them in 5VDC or 6VDC - maybe 3VDC, but 5 or 6 will be easier for me to work with.

I spend a lot of time in libraries, reference sections. ...