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Join Date: Jun 2018
Location: Hendersonville, NC
If you have a power supply, then that'll work. But, you can use a straight battery to an LED and be fine most of the time as long as you know how much current the battery is putting through it. For instance, I have a 3v smd led I soldered leads onto to make a simple flea-plate. I used a 3v computer battery which left the light running for close to a week or so if I recall correctly.
The minimum current, before the led shuts off is something like 2v or 1.9v at which point it barely emits anything, but at 2.0 or 2.1 it still works. The led burns out at over 3.5v - I haven't actually reached the voltage to burn it out yet because they usually pop because of the heat, pressure, delamination, etc..
Most batteries have more voltage output than what is on the label... 9v batteries, for instance, typically output 9.6v to 10+v when measured. This drops as the energy levels drop. Also with DC you're fine in a range, however for consumer electronics I'd probably only use a power supply rated for the appropriate voltage, or, for short term, one which is a few percent off.
Some leds have a smaller range than ~1.5v....
Now, for your case led... Get a multimeter and find out what voltage the motherboard is trying to output - all of them should be standardized because they can go in any number of cases - it'll probably be 3v, without looking up anything... But it may not be - I don't know the exact rating of case leds but I could test it.
You could also look up the rating from your motherboard manual - they sometimes have the voltage outputs - use that to test the led ( since single-use batteries output more, you could use rechargeable batteries which puts out less to be more at that limit )... IF you're unsure, make quick connections and wear eye protection although for them to pop it usually requires a little build-up and a lot of them will burn out before they can pop, but not all.
Anyway, then put some batteries together and make a quick connection. Although, if your case led is burned out, you may want to remove it and inspect it visually - if you see a dark spot or it doesn't look normal, and it should be pretty obvious if it is burned out in most cases, then replace it.
Last edited by Acecool; 02-04-2019 at 06:29 AM.