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variable frequency generator? (to power a transistor)

Discussion in 'General Electronics Discussion' started by supak111, Jun 9, 2013.

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  1. supak111

    supak111 ★ƃuᴉɯǝɥɔs sʎɐʍlɐ★

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    Apr 29, 2012
    I need a device that can operated say a transistor at variable frequencies, say between: 0-10kHz

    I'm sure there are such electronics on the marker, what are they called? or would I need to build one? If so how difficult would it be?
     
  2. poor mystic

    poor mystic

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    :)
    What's it for please?
     
  3. davenn

    davenn Moderator

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    a function generator is the usual name for the unit. They usually have switchable sine, square or triangular waveform output with variable freq and level controls

    Dave
     
  4. supak111

    supak111 ★ƃuᴉɯǝɥɔs sʎɐʍlɐ★

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    I just want to play around with making a simple super fast RPM motor out of a neodymium magnet. I've seen people get the magnet going up to 500K rpm on YouTube

    Thanks I'll look into "function generator". Square sine is probably what I need for the job and adjustable power output would be nice.
     
  5. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

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    Really?
     
  6. supak111

    supak111 ★ƃuᴉɯǝɥɔs sʎɐʍlɐ★

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    claims 500k rpm

    claims 300k rpm

    Everything seems to be right but who knows.


    I have a question, what transistor would be a good choice for doing something crazy like this? I am planing on using a a cheap ebay function generator:
    http://www.ebay.com/itm/New-DDS-Fun...373?pt=LH_DefaultDomain_0&hash=item257edf7bbd

    to power a transistor which will power a coil. What transistor can handle say up to 100kHz and I'm hoping to power it by up to 100v

    I'm probably gonna need a TV sized heat sink for it lol.
     
    Last edited: Jun 10, 2013
  7. poor mystic

    poor mystic

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    Apr 8, 2011
    500k RPM translates to 8.3kHz, and I'd be scared of something spinning that fast - it might come to bits in an awful hurry.
     
  8. supak111

    supak111 ★ƃuᴉɯǝɥɔs sʎɐʍlɐ★

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    Apr 29, 2012
    yea I know that would be a lot of metal flying everywhere. I can't even imaging the G forces that are acting on the magnet at those rpms.

    ps. ill just stand clear of the axis it spins on
     
    Last edited: Jun 10, 2013
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