Old 05-06-2011, 08:38 AM #1
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Default Piddling Around with Homemade PSU....

So I was piddling around with my homemade labby PSU and a yellow LED I got from an old computer....

There were a couple of weird things... firstly:

When I turned up the current (started at like 40mA), it changed colors. At first it was yellow, then it gradually turned orange and then orange red at higher currents.

Secondly - why did it survive so much current? I know LEDs are more hardy, but still - aren't most LEDs designed for only 20-30mA? I fed it over 200mA and it is still functioning.


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Old 05-06-2011, 03:16 PM #2
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Default Re: Piddling Around with Homemade PSU....

Maybe now it functions via blackbody radiation?
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Old 05-06-2011, 05:13 PM #3
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Default Re: Piddling Around with Homemade PSU....

Haha. Except... why would it become cooler as we ran more current through it?
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Old 05-06-2011, 05:18 PM #4
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Default Re: Piddling Around with Homemade PSU....

IIRC _tesla ran a neon sign transformer arc through a cheapo red diode and it melted the metal leads and it still worked perfectly fine..? It was the weirdest thing I seen.
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