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Tolerance for high voltage capacitor in a microwave oven.

Discussion in 'General Electronics Discussion' started by MidAtlantian, Jun 13, 2018.

  1. MidAtlantian


    May 12, 2015
    HI, I am trying to repair a microwave oven (yes, I am aware of the hazards, both microwave and high voltage) and have found that the high voltage capacitor has shorted. I have a replacement (for a smaller unit) but it is .76mf vs the original .86mf. Will this allow too much ripple of the resulting voltage? Will it damage the magnetron?
    Thanks for any suggestions.
  2. kellys_eye


    Jun 25, 2010
    Assuming a standard microwave (not the inverter version) then the DC is at 50/60Hz so the capacitor isn't reducing ripple but is used to make a voltage doubler. You may see (feel?) a small reduction on power but it won't do any damage.
    MidAtlantian likes this.
  3. MidAtlantian


    May 12, 2015
    Thank you for your reply! Yes, I suspect "feel" might not be an ideal way to make a judgement. :)

    So it is effectively the total energy the capacitor is able to store (for each wave) that limits its function? That would mean the resulting DC voltage going to the magnetometer would be a bit lower? Will the difference be the full 12% represented by the difference in capacitance?
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