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LED's and a single rectifier

  1. Apr 13, 2010 #1
    If an LED is connected to a single rectifier, resulting in a half wave, will this cause the LED to pulsate?!
    I no a bridge-rectifier will work and is more efficient to keep the LED constantly on but can a single rectifier work???
  2. jcsd
  3. Apr 13, 2010 #2


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    Science Advisor

    Yes, it does pulsate, but it is still at 60 Hz so you can't see it. A bridge or full wave rectifier gives 120 Hz from a 60 Hz supply.

    You can add a capacitor across the output of the rectifier and get a steady DC voltage. This is worth doing and results in brighter output.

    Without the capacitor (maybe 1000 uF) the LED has to get high current pulses to appear bright.
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