300v cap?

Discussion in 'The Projects Forum' started by Gadersd, Jul 19, 2013.

  1. Gadersd

    Thread Starter Member

    Dec 8, 2012
    98
    1
    I just read an article about using a camera's flash cap for an emp. It said that the cap can charge to voltages up to 300v. How can 3v from 2 AA batteries charge a cap to those voltages?
     
  2. wayneh

    Expert

    Sep 9, 2010
    12,145
    3,054
    Magic, clearly.

    But seriously, look up voltage multipliers.
     
  3. Gadersd

    Thread Starter Member

    Dec 8, 2012
    98
    1
    I just looked it up. Everywhere I looked said that voltage multipliers are used to amplify an ac voltage to a dc voltage. A camera uses dc. How would this work?
     
  4. wayneh

    Expert

    Sep 9, 2010
    12,145
    3,054
    It runs a DC-powered oscillator to create AC, which is then stepped up.
     
  5. MaxHeadRoom

    Expert

    Jul 18, 2013
    10,553
    2,375
    This?
    Max..
     
  6. wayneh

    Expert

    Sep 9, 2010
    12,145
    3,054
    Yup. I could never draw such a thing from memory but it looks about right once I see it.
     
  7. bountyhunter

    Well-Known Member

    Sep 7, 2009
    2,498
    507
    Probably a simple boost converter. The current is very low.
     
  8. DerStrom8

    Well-Known Member

    Feb 20, 2011
    2,428
    1,328
    It uses a simple transistor oscillator to drive a transformer, which boosts the voltage up significantly. This is what charges the capacitor.

    I wouldn't expect an "EMP" gun built from a camera flash circuit to be able to do damage to much more than, say, a small calculator.

    Regards,
    Matt
     
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