Make a simple 12 volt power supply - Instructables Have you ever needed a 12 volt power supply that can supply maximum 1 amp? ... This circuit will not adequately power a 15W amplifier, however, so don't use it. ... to get the power down from 14.4v to 12v (No more than 500mA), DC to DC.
12V fixed voltage power supply circuit diagram ~ CircuitsTune This is a simple 12v power supply circuit diagram. It has a fixed voltage output and it based on LM7812 voltage regulator IC.