Re: What's Wrong With This Picture??
Some panel mount LEDs have an internal diode bridge to make them non polar. This allows them to be used on AC and reverse polarity DC systems. Also, some LEDs are bright enough that even when they are only on half the time, they still give enough light to indicate acceptably. There will be a resistor or other current limiting circuit as part of the indicator.
The ones that give me fits are the ones that change color with polarity or by mulitple lead connections. I am red/green color blind and though I can usually see that the cussed thing is ON, I cannot always tell what color it is.
Last edited by OPossumTX; 01-09-2013 at 05:24 PM.