LED burnout Answered
I've have an LED problem that I have done extensive reading and troubleshooting on but I can't seem to solve it. I'm running 4 super bright white LEDs (NTE30071) in parallel from a 24v 600mA DC wall wart. The LEDs are 4V, 25mA. I need that wall wart to also run a solenoid. When a button is pressed a relay powers the lights and the solenoid for a few seconds. The problem is my LEDs keep dying. At first I had a 10K ohms 1/4W resistor on each and I lost 3 LEDs. After more study and calculation just replaced them with 1K ohms 1/2W resistors. After a few more hours I lost another. When I removed the 10K ohms resistors they read 1K ohms. And I just tested the one on the 1K ohms resistor that went out and it reads 200 ohms. I know there is something that I just don't get; something basic that highlights my lack of any electronics experience. I appreciate any help you can give, this is just is just wearing me down.