LED's and a single rectifier

  • Thread starter tobi101
  • Start date
  • #1
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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???
thanks
 

Answers and Replies

  • #2
vk6kro
Science Advisor
4,081
40
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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