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how to switch circuit on and off

Discussion in 'High Voltage' started by lokeycmos, Nov 4, 2011.

  1. lokeycmos

    lokeycmos New Member

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    to start off this is my 2nd thread on this forum. i would like to restate that i am very experienced with high voltage, you can check my site in my profile. i came across a cool project that i would like to duplicate but also make a little better. here : http://www.youtube.com/watch?v=q0MbY0w8F3o is a video of a guy that charged up a couple microwave oven caps and discharged them through an ignition coil. i have all the parts. what im wondering is if there is a way to make it free running, similar to a marx generator. im thinking about using a spark gap that fires at a certain voltage, recharges the cap and fires again. i would like some input from other more experienced high voltage enthusiasts if they have any input or ideas on this. thank you.
     
  2. Sceadwian

    Sceadwian Banned

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    Microwave oven caps are designed for high voltage DC rectification buffering, for full charge/discharge I fail to see how they could function. they'd last a fraction of their rated life.
     
  3. unclejed613

    unclejed613 Well-Known Member

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    actually, there's a fair amount of AC current through microwave caps. the arrangement they are used in is a pseudo voltage doubler arrangement requiring only one diode and cap in series with the transformer secondary. that puts the mag cathode at a -2500V baseline potential, that alternates at 60hz between -2500V and -5000V.
     
  4. dave

    Dave New Member

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  5. Sceadwian

    Sceadwian Banned

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    The cap is in series? Man I must have NOT been paying attention when I took the last one apart =\
     
  6. unclejed613

    unclejed613 Well-Known Member

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    here's the secondary circuit of an oven. all of the AC current in the secondary circuit passes through the cap. every microwave oven is the same except for Panasonics that use a flyback transformer.


    that could be hazardous to your health if the cap is still charged :eek:
     

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    Last edited: Nov 11, 2011
  7. lokeycmos

    lokeycmos New Member

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    this is what i was thinking. let me know what you think
     

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  8. unclejed613

    unclejed613 Well-Known Member

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    i have a Marconi book from 1917, and the traditional "ignition coil transmitter" (in the chapter on "emergency transmitters" looks like this:

    for the spark gap you can use a gas tube device like what is used in some equipment for surge protection. they fire at 350 volts or so.
     

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    Last edited: Nov 13, 2011

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