Need circuit to magnetize a magnet

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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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:

This may also be of interest:

Nels

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

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

"john jardine" a écrit dans le message de news:dfl0ho$nuk$ snipped-for-privacy@newsg1.svr.pol.co.uk...

for

which

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 )

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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

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

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?

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Home of DaqGen, the FREEWARE signal generator

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

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

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

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

Or this?

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

Tom

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

Tom