Debugging spark-gap transmitter

Discussion in 'General Electronics Chat' started by ttarique, Jul 25, 2013.

  1. ttarique

    Thread Starter New Member

    Jul 2, 2010
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    Hi guys I am building a spark-gap transmitter, without the Antenna, according to the diagram that is attached below.
    I have used C1=C2=4700uF, R=10K, L=2.16 mH, Frequency=50Hz. My supply voltage=12 Volt.

    But I am NOT seeing any spark. I have tested the voltage of the Capacitors. Voltage across C1=12 volt, C2 is 0 volt. Do you have any idea where did I make the mistake?
     
  2. Ramussons

    Active Member

    May 3, 2013
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  3. odinhg

    Active Member

    Jul 22, 2009
    65
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    I don't think you'll see any sparks with your 12V supply.
     
  4. wayneh

    Expert

    Sep 9, 2010
    12,087
    3,027
    You need about 100,000 volts per inch of gap to get a spark to jump in air. At that field strength, the air molecules ionize and begin to conduct.
     
  5. PackratKing

    Well-Known Member

    Jul 13, 2008
    850
    215
    Be cautious about these... Higher voltage Spark transmitters put up a LOT of wideband RFI, even if not hooked to an antenna...and can possibly have the FCC down on you... They have NO sense of humor...

    The fines are substantial...
     
  6. wayneh

    Expert

    Sep 9, 2010
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    Oops, I meant 10,000V per inch. That's for DC.
     
  7. ttarique

    Thread Starter New Member

    Jul 2, 2010
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    Do you guys know how can I generate Kilo Volts for the power supply?
     
  8. odinhg

    Active Member

    Jul 22, 2009
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    You should really start with something less dangerous and learn the basics before playing around with high voltages.
     
    Last edited: Jul 26, 2013
    PackratKing likes this.
  9. PackratKing

    Well-Known Member

    Jul 13, 2008
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    I will concur with odinhg's advice

    HV will not cry after it kills you if you are careless, tho' those you leave behind likely will.
     
  10. wayneh

    Expert

    Sep 9, 2010
    12,087
    3,027
    +1
    This is a very bad starting point for a noob. Other than making sparks, is there something you want to accomplish with this project?
     
  11. Dodgydave

    Distinguished Member

    Jun 22, 2012
    4,967
    744
    You could use a Marx circuit generator, or Eht generator circuit
     
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