HOME BASE/Battery Recharger

morris4019

I am going to make a kind of home base, that will eventually be topped with a IR Beacon. For now, I need it to recharge a very small 3v battery (about the size of a dime). Anyway, I have found this circuit for a charger using a wall transformer. My question is, I would like this home base to be mobile, without cords, for free movement all the way around it. Can I just replace the corded wall transformer with say a 9v battery?

-Mike

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······ I'll try everything once [noparse]:)[/noparse]

Franklin

Probably not. you need better control of the charging rate and some "smarts" if you are charging nimh or li-anything type batteries.

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- Stephen

kwinn

Franlin is right. You need to control the charging current. That circuit you posted would either fry the wall wart, the diode, or the battery. Once you have a charge control circuit however there is no reason it could not be powered by another battery.