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Difference between Half and Full bridge-Plasma speaker

Discussion in 'General Electronics Chat' started by spitso, Apr 28, 2009.

  1. spitso

    spitso Member

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    thank-you you explained quite a bit.Would you happen to have a larger or clearer sized schematic you could send me, cant really see some components clearly. As well have you tested this yet? how does it work? would you be able to upload a video please?

    thank-you again
     
  2. Izidor7

    Izidor7 New Member

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    What do you whant to know, be a litle more precice. Wich schematic. what would you whant?
    by
     
  3. spitso

    spitso Member

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  4. dave

    Dave New Member

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  5. Izidor7

    Izidor7 New Member

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    ok, The schematic is the same as the one from Instructables-robot, the only diference is tahat i added a gate drver. http://img144.imageshack.us/my.php?image=transistorpushpullfollo.gif

    Nothing spectacular...... i had put DB139 +DB140 and it works fine. . the only problem is that the pnp heets verry much , because of the high discharge current.... but, a small heatsink will prevent it to explode....

    These i use can handle a peak current of 6A and taht would be a good enuf to drive two mosfet's..... and a dc current of 1,5A... but that isn't so relevant. anyhow, the current limiting could be achived by puting a bigger gate resistor, maybe 20 ohm.... so the pnp wouldn't be so hot... but, as long as it works it's fine with me, and the slower fall or rise time wouldn't be a problem.... as long as the gate is driven correct... what wasn't the case in the first schematis from Plasmana, at instructables - robot.....

    Even the ucc's work the same way. but they have a npn, a n-mosfet, and a pnp, and a p-mosfet for a driver so it can give much peak current . in a small case... and small power disipation.
     
  6. excrucio

    excrucio New Member

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    schematics

    izidor can you post 100% working schematics of plasma speaker???

    thanks
     
  7. audioguru

    audioguru Well-Known Member Most Helpful Member

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    The amplifier project is An Instructable.
    Instructables are written by people who know nothing about electronics and they do not read the datasheet for the device.
    The amplifier is missing very important parts. Most Instructable projects are missing very important parts.
    The amplifier has hardly any output power (0.3W) anyway.
     
  8. Izidor7

    Izidor7 New Member

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    Yes , that is my point!
    Therefor people do not acheeve good results with the circuits...
    in fact it is hard to make a good schematic. You must concidure all the posibilities and construct a reliable and good circuit........ not only to make it work once....
     
  9. excrucio

    excrucio New Member

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    Izidor7, your driver you made, (http://www.instructables.com/files/d...S9O.MEDIUM.jpg), the picture isn't big enough to see writing.
    Please, can you upload a bigger picture??
    I read about plasma speaker and I know that you have just added a gate driver but I don't understand the thing in upper right corner and something else too, please post a bigger picture!
    Please.:eek::eek:
     
  10. audioguru

    audioguru Well-Known Member Most Helpful Member

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    The problem with the schematic is that it was saved as a fuzzy JPG file type instead of saved as a very clear GIF or PNG file type.
     
  11. excrucio

    excrucio New Member

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    audioguru, can you make new schematic and post it???
     
  12. Izidor7

    Izidor7 New Member

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    Last edited: Aug 31, 2009

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