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Building magnet-magnetizer

Discussion in 'Misc Electronics' started by jean, Nov 9, 2003.

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  1. jean

    jean Guest

    I've got a old electro therapy machine from 1850. It is a simple
    horse-shoe magnet with 2 coils rotating in front of it. But the magnet is
    weakend after 153 year. I want to build a magnet-magnetizer. Can somebody
    help me with tips suggestions or mabye even plans.


  2. Al

    Al Guest

    When I was a kid, I magnetized my screwdrivers by placing them in a
    solonoid and sparking a 6V lantern battery across the terminals of the
    coil. Made them strong enough to pick up nails and screws.

  3. Tweetldee

    Tweetldee Guest

    Yuppp that's almost what I was going to suggest. My thought was to remove
    the magnet and wind as many turns of 16 or 18 gauge wire around it as will
    fit. Then get a high current power supply, one that can put out several
    amps of current at around 5 volts or so. Apply the current to the winding
    for a few seconds and see if it increased the strength. If the strength
    seems lower, reverse the polarity of the power supply connection and try
    Don't know how long to suggest that the current be applied.. A word of
    caution here... be sure that the power supply you use has current limiting,
    or at least some form of short circuit protection. The reason being that
    the winding will present a very low resistance load and could damage an
    unprotected power supply.
    Tweetldee at att dot net (Just subsitute the appropriate characters in the

    Never take a laxative and a sleeping pill at the same time!!
  4. You just wind a lotta turns of wire around the magnet poles, and put
    DC thru the wire. Make sure you get the polarity right. If you use
    very heavy wire, you could probably do the job with a car battery.

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  5. Garrett Mace

    Garrett Mace Guest

    It might be interesting to find out how it was originally done in 1850, then
    try to duplicate that.
  6. AC with a diode also works. AC without the diode makes a dandy demagnitizer.
  7. Art

    Art Guest

    Old Theory includes holding at a specific angle and striking with a heavy
    hammer, or placing soft iron in close proximity with natural "Lodestone"
    out-cropping. BTW during that period there was a plethora of DC power
    supplies use and inductors. Not totally ancient history. Alex Gra Bell's
    period, Eh.
  8. --------------
    Take the permanent magnet out and heat it red hot with torches and
    then slip electromagnets around it and sustain a powerful field till
    it cools well below the glowing stage into the deep IR.

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