Power supply 4.5 A with 3 LM317 in parallel

Power supply 4.5 A with 3 LM317 in parallel
This lm317 variable power supply can supply a voltages from 1.2V to 30V with a current 3 amperes, just as the title of this series based on LM317T voltage regulator, the LM317T regulator provide around 1.5 amperes on the heatsink, so by installing a parallel two or three of them will get a voltage source capable of providing 3 amperes. Obviously this also depends on the transformer used. (more…)

Super-Clean 9VDC Power Supply Circuit

Super-Clean 9VDC Power Supply Circuit
This circuit will give you a 9V regulated DC voltage at maximum current of about 1A. The circuit uses stepdown tansformer with secondary output voltage of 25V AC and 1A current. The primary voltage depended your home electrical power line installation. If your power line voltage is 110V then you must find transformer 110V primary voltage. The diode can be 4 pieces of 1N4002 (1A rectifier diode) or a 1A bridge diode. (more…)