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![SOLVED]12v UPS DIY circuit attiny85 lm317 - Raspberry Pi Forums](http://homediyelectronics.com/projects/raspberrypi/ups/images/simple_ups_charger.png "SOLVED]12v UPS DIY circuit attiny85 lm317 - Raspberry Pi Forums")
SOLVED]12v UPS DIY circuit attiny85 lm317 - Raspberry Pi Forums
A Simple DC UPS | Nuts & Volts Magazine
