Re: Powering LEDs with track power

gowers21
 

Many circuits that I have seen include a diode with the resister.  This is a protection item so that if track power changes (within an auto-reversing loop using an AR-1, or during a short, for example), the LED will not be fed power from the wrong side.  A diode only allows power to flow in one direction and safeguards the circuitry.

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