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.
Note before assembling:
- Make sure the transformer is to provide currents as on the label.
- Regulators should be installed on aluminum heatsink very nicely.
- Although the source has a short-circuit protection and over-consumption, it depends on the size of the heatsink, because when this error occurs, the temperature emerges, and it is best not to give short for fun.
- When a short circuit occurs Power LED will be slightly decreased in brightness, but the best thing would have a voltmeter to display these errors.