Do I need a smoothing capacitor?

Discussion in 'General Electronics Chat' started by magnetman12003, Jun 5, 2015.

  1. magnetman12003

    Thread Starter Active Member

    May 10, 2008
    I have harvested 160 volts DC off the outer surface of a plasma ball lamp after running it through a hi voltage, hi current, full wave diode bridge rectifier. With no smoothing capacitor.

    My plan now is to dump that voltage directly into a 20 FARAD capacitor. Yes - a 20 FARAD cap.
    What I need to know is do I need some sort of smoothing capacitor on the bridge rectifier to smooth
    whatever pulse AC frequency the plasma ball is generating? If its needed at all - what value? That's prior to dumping it into the large cap.
    Please check this out first.

    All help greatly appreciated
    Last edited: Jun 5, 2015
  2. blocco a spirale

    AAC Fanatic!

    Jun 18, 2008
    Considering the very high impedance of the outside of a plasma ball lamp, you are being optimistic if you think you will be able to "dump" the surface charge into a 20F capacitor and achieve any useful effect.
    Last edited: Jun 5, 2015
  3. wayneh


    Sep 9, 2010
    Nope. The pulses are DC and will slowly push charge into your big capacitor. That must be rated for the voltage you take it to, or you'll ruin it.

    I doubt your device will move enough charge to overcome the leakage current of your capacitor.