freqres

• Tutorial - Unregulated Power Supply Tutorial | about 6 years ago

  Pop Quiz Answer: The 120Hz signal comes from the full-wave, center tapped rectifier. Since each diode conducts during half of the incoming 60Hz waveform (one on the positive half cycle, one on the negative half-cycle), you get double the incoming frequency on the output of the rectifier.
  BTW, great beginner tutorial.

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