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Discussion in 'LEDs and Optoelectronics' started by Dylan Wisdom, Apr 14, 2014.

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  1. Dylan Wisdom

    Dylan Wisdom

    Apr 10, 2014
    Is there anyway to get an LED to turn on when current stops flowing?
  2. sirkituk


    Mar 27, 2009
    use an inverter circuit
  3. duke37


    Jan 9, 2011
    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.
  4. dude


    Apr 15, 2014
    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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