How this two LED turn ON simultanously?

Discussion in 'General Electronics Chat' started by Agung Riyadi, Aug 7, 2017.

  1. Agung Riyadi

    Thread Starter New Member

    Aug 7, 2017
    4
    1
    I am still curious, two parallel LED with opposite polarity, both can light up.
    It is from a powerbank circuit I just open to repair.
    The LEDs are for indicator.
     
  2. crutschow

    Expert

    Mar 14, 2008
    20,251
    5,733
    When the voltage from pin 3 is positive with respect to pin 1, the left LED lights.
    When negative, the right LED lights.
     
  3. Agung Riyadi

    Thread Starter New Member

    Aug 7, 2017
    4
    1
    How about both LEDs turn on? What the explanation
     
  4. BR-549

    AAC Fanatic!

    Sep 22, 2013
    4,134
    1,098
    If you switch the LEDs on and off, fast enough......they both will appear to be on.
     
  5. Agung Riyadi

    Thread Starter New Member

    Aug 7, 2017
    4
    1
    Yea I guess this. The IC some kind of black box that have nano second pulse...that can manage 2 opposite parallel LEDs which one or both on off or blinking.
    Small IC ,,,
     
  6. crutschow

    Expert

    Mar 14, 2008
    20,251
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    Any pulsing beyond a 100Hz or so is not perceptible to the human eye.
     
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