Hopefully, someone here could answer my newbie question: In the "Power Supply" project using LM338K, what changes should i do, to add a LED as a POWER ON indicator? I'm planning to use this as a power supply for circuits requiring 9-15V.
Place the LED just before the regulator. Use any of the online LED dropping resistor calculators to figure out a resistor value for the series resistor based on the voltage of your circuit after the bridge rectifier (about 30% higher than the output of the transformer...not really critical for a simple LED though).
Variable Power Supply Question
Posted - Feb 09 2012 : 10:32:48 PM
