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Need help with voltage doubler

Discussion in 'Electronic Basics' started by [email protected], Nov 11, 2005.

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  1. Guest

    I keep blowing capacitors so I need help :) Right now the only two
    good capacitors I have are 50v 1000uf and 50v 47uf.

    right now DC source 5.25 volts


    Isn't it

    possitive on battery, capacitor #1, diode going to each leg of the 2nd
    capacitor, one leg of 2nd capacitor going to ground, the other going to
    negative on the battery.
     
  2. Andrew Holme

    Andrew Holme Guest

    Get the right capacitors. You want two of equal value.

    Electrolytic capacitors are sensitive to polarity and will blow up if you
    connect them the wrong way round; subject them to excessive AC current; or
    exceed the rated voltage.

    The first hit on Google for "voltage doubler" is a simple DC-DC converter
    using a 555 timer.
    The second hit shows the classic voltage doubler circuit using an AC mains
    transformer.

    http://www.reconnsworld.com/power_voltdoubler.html
    http://hyperphysics.phy-astr.gsu.edu/hbase/electronic/voldoub.html

    The + sign against the secondary of the transformer in the 2nd link makes no
    sense.
     
  3. Voltage double on a battery with only some caps and diodes??? I think you
    need some switching or an AC source.
     
  4. It isn't. Can't but strongly advise you to find a textbook covering basic
    electricity, voltage, current, power, Ohms and Kirchhoffs laws, DC and AC.
    Don't expect someone to build an electronic circuit without at least this
    basic knowledge.

    petrus bitbyter
     
  5. Guest

    It does seem to work with a coil/magnet setup that outputs about .6v
    AC. I've seen over 2v off of that. Right now I'm thinking regulated
    1000v 25ma power supply thats already doing everything for me ;)

    Eric
     
  6. Guest

    The second link looks like what I'm trying. What about "non polar"
    electrolytic capacitors?
     
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