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Need circuit to magnetize a magnet

D

David Bezinque

Jan 1, 1970
0
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
 
M

mike

Jan 1, 1970
0
David said:
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

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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N

Nelson Johnsrud

Jan 1, 1970
0
David said:
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

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
 
J

john jardine

Jan 1, 1970
0
David Bezinque said:
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

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
 
F

Fred Bartoli

Jan 1, 1970
0
john jardine said:
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

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 )
 
M

Mike

Jan 1, 1970
0
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
What type of magnet material and what's size of the magnet?
Make a BIG difference in what you need.
Mike
 
J

Jasen Betts

Jan 1, 1970
0
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.

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
 
J

john jardine

Jan 1, 1970
0
"Fred Bartoli"
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 )
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
 
B

Bob Masta

Jan 1, 1970
0
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.

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
 
M

Mike

Jan 1, 1970
0
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

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
 
E

Eric R Snow

Jan 1, 1970
0
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
 
M

Mike

Jan 1, 1970
0
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
 
T

Tom MacIntyre

Jan 1, 1970
0
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

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
 
T

Tom MacIntyre

Jan 1, 1970
0
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?

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

Tom
 
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