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This LED candle runs from a PIC 12F675 and is powered by 4 AA batteries to make up a 6 volt power supply with a 1N4148 diode that has a 1 volt voltage drop to turn it into the 5 volts that the PIC requires. The LEDs used were 15,000mcd to make the “flame” very bright. Check out the parts list and circuit diagram at the link below.

LED Candle via Electronics Lab