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Need circuit to magnetize a magnet

Discussion in 'Electronic Basics' started by David Bezinque, Sep 6, 2005.

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  1. I am a high school Physics teacher and I need a circuit to magnetize a
    magnet. Several years ago, I saw one in a book published by TAB.
    Unfortunately, I have forgotten the title. I do recall that the
    circuit had about a dozen LARGE capacitors and an SCR.

    I already did a search using Google, Yahoo, etc. I found a few
    circuits but nothing that gives part numbers or the kind of detail a
    newbie needs.

    TIA
    David Bezinque
     
  2. mike

    mike Guest

    If you're not gonna do this a lot, just use the caps and a switch made
    from some nails that cross. Sacrifice the nail to make the magnet.
    mike

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  3. In pursuing another hobby in another life, I used to rebuild antique gas
    engines, and had the occasional opportunity to rebuild a magneto, and
    recharge the magnets in it. Do a Google search for "magnet charger" and
    several good designs will pop up. Not all designs require the caps, but
    you do need a source of instantaneous high current. Most magnet
    chargers I have seen are supplied by car batteries, but there are some
    that run from the AC line. Here are a few samples:

    http://www.magnetoparts.com/inst_guides/charger/page1.htm
    http://www.oldengine.org/members/rotigel/Magnet/
    http://www.old-engine.com/magsum.htm

    This may also be of interest:
    http://www.smokstak.com/forum/showthread.php?t=4296

    Nels
     
  4. john jardine

    john jardine Guest

    In UK, a very good but politically incorrect method is to rectify the 240V
    mains with a 6 amp bridge rectifier and feed the DC to a dozen heavy turns
    wrapped round the magnet to be.
    Switch on and of course the local fuse blows but in the few mS it takes for
    this to happen, a frighteningly high magnetic field has been developed which
    can magnetise just about anything within its grasp.
    (switch off any nearby PC's beforehand and act dumb when the neighbours
    start knocking on your door :)
    regards
    john
     
  5. Fred Bartoli

    Fred Bartoli Guest

    Hey John, wasn't this that last Friday 11:45AM that you did it the last
    time?
    (we had a huge power sag here that shut off my PC )
     
  6. Mike

    Mike Guest

    What type of magnet material and what's size of the magnet?
    Make a BIG difference in what you need.
    Mike
     
  7. Jasen Betts

    Jasen Betts Guest

    40 turns of 22AWG surplus telephone wire around your magnet candidate
    (or wire from insidde cat5 cable etc), wear safety goggles, gloves etc
    hook it to one end of a set of quality 400A jumper leads, hook the other
    end to a car (or truck, forklift, submarine etc) battery.

    when the smoke clears you'll have a permanent magnet. :)

    Bye.
    Jasen
     
  8. john jardine

    john jardine Guest

    "Fred Bartoli"
    Late Friday?. Mmmm ... . Oops!, that would have been the Mk2 ball plasma
    experiment. I usually wait until the national grid is lightly loaded.
    (the doctors tell me the sight in my remaining eye will return in few days
    :)
    regards
    john
     
  9. Bob Masta

    Bob Masta Guest

    Anyone know how magnets are made commercially?
    I was under the impression that they were made in ovens,
    with a steady applied field that was maintained while the material
    cooled below its Curie point. True?


    Bob Masta
    dqatechATdaqartaDOTcom

    D A Q A R T A
    Data AcQuisition And Real-Time Analysis
    www.daqarta.com
    Home of DaqGen, the FREEWARE signal generator
     
  10. Mike

    Mike Guest

    I don't know about all magnets, but I built an impulse magnetizer for
    a small business that manufactures high performance motors for people
    who race slotcars. He buys the uncharged cermaic material in the shape
    he needs then anchors two the uncharged pieces in the magnetizing
    chamber of the magnetizer, pushes the button and a few milliseconds
    later he has matched pair magnets for a motor. When the magnets lose
    their strength from heat etc, he just recharges them the same way he
    made them.
    I think most magnets are made this way, but I'm sure there are special
    types that require more elaborate procedures.

    Mike
     
  11. Eric R Snow

    Eric R Snow Guest

    So howdja build it? Can you post a circuit or a link?
    Thanks,
    Eric
     
  12. Mike

    Mike Guest

    Sorry, but I'm still selling a scaled down version for the guys to use
    so they can "zap" their magnets and not have to send them off to get
    them zapped. Anyway I don't have a website or anyway to draw an
    electronic version of the schematic.

    Mike
     
  13. Bottom of the page...use it to recharge many magnets?

    http://www.unitednuclear.com/magnets.htm

    Or this?

    http://www.consult-g2.com/course/chapter5/chapter.html

    Ironically, in two searches I did, your post shows up in the top 5...
    :)

    Tom
     
  14. According to what I read, it has to be very quick.

    Tom
     
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