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LED's

duke37

Jan 9, 2011
5,364
Joined
Jan 9, 2011
Messages
5,364
A LED will only produce light when current is passing through it.

If you wish to light a LED when passing through some other part of the circuit, in order for us to help, you will need to give more information.
AC, DC, amperage, voltage, rate of curent change etc.
 

dude

Apr 15, 2014
35
Joined
Apr 15, 2014
Messages
35
Like the others have said, hard to answer that question without knowing your particular application. If its just part of a circuit you are trying to monitor, bias a PNP transistor to earth with an appropriate resistor, then run another (appropriate) resistor to between that and the base, fed from the current you are trying to monitor. At least that's how I think I solved that particular problem once upon a time, there's probably easier ways.
 
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