Battery Backup 12v

Community General Discussions
, , , ,
1

Hello, I wanted to add a battery backup to a Picaxe circuit so when the AC main fails the power will switch from the AC-DC transformer to a 12v battery which is then lowered to 4.5v to power the PICAXE board.

after some research I found this circuit which seems pretty simple and I wanted to know if you people think its good or will I have fried PICAXE for dinner.

backup.gif

Thanks in advance!  :D

2

???

Unless you have other circuitry that uses 12 volts, why not just go with a 6 volt supply? This is way overkill just to keep a PICAXE running, IMHO.