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little_capacitor Posted - Feb 09 2012 : 10:32:48 PM
Hi people.

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.

Thank you.
2   L A T E S T    R E P L I E S    (Newest First)
little_capacitor Posted - Feb 15 2012 : 10:46:37 PM
Thank you for your answer Aaron
Aaron Cake Posted - Feb 12 2012 : 10:32:35 AM
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).

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