>>I need some guidance on how to run a 3-5v PIC circuit efficiently from
>>a 12V, 12A-type (Radio Shack 23-144) battery. (The case I want to
>>use is designed specifically for this battery).
>>    
>>
>
>Do you actually need a 12V supply ? LDO micro-current regulators
>I've seen (MCP1700 for example, 1uA active) have an input limit of
>6V or 10V
>
No, I DON'T need 12V. I don't WANT 12V. It's just that the enclosure I'd 
like to use is designed to fit a 12V Key FOB battery (it has a bulge 
where the battery rests in the enclosure). I went to Radio Shack and 
looked for a lithium cell that would fit the enclosure, but none of them 
are small enough (except for the coin cells, which kind of defeat the 
purpose of this enclosure.

Dwayne suggested a single-cell step-up converter and an N cell (thanks, 
Dwayne) something I didn't know that you could do. It looks like it 
might work out really well. The only fly in the ointment is that the N 
cell is a bit larger than the A23, which fits my enclosure pretty 
snugly, so I'll have to go buy an N cell in the morning and try it out.

  --Steve.
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