Black Box Indicator LED help

Thread Starter

MrJojo

Joined Jan 23, 2013
45
Hello,

I'm creating a black box with a few power supplies and an Ethernet connector. I want to be able to make sure when I turn power on, an indicator will turn on. I was thinking about having 3 LEDs, 1 for each power supply (48V, 5V, and 12V). I found out that my LED's "turn on" around 15mA, but they look very weak. I was going to put in a current limiting resistor for each LEDs power supply so once the power supply reaches it's proper voltage, the LEDs would turn on.

I was wondering if there is a better way to do this and if there was a way to make the LED brighter.

In all honesty, I think I'm over complicating things by trying to find the "turn on current" for the LEDs and should just put in a resistor that gives 25 mA. I just want to make sure that the power supplies are outputting the proper voltages.

Thanks,
Matt
 

mcgyvr

Joined Oct 15, 2009
5,394
more current = brighter LED.. Its as simple as that.
Just use the proper resistor value to achieve 20-25mA supply and move on IMO.. (assuming they are "typical" 20mA LED's)
 
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