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We can’t see magnetic flux lines but with an inexpensive piece of Magnetic Viewing Paper we can easily visualize what we are missing. I took the motor magnet out of an old 5 1/4 floppy drive and was amazed at the complex magnetic pattern that emerged. It looks like the outer ring of the magnet has magnetic notches that are read by the electronic circuit. I imagine this is used for speed control, although this seems like a very complex method of regulating motor speed. You can also “watch” a relay energize by holding the viewing paper beside a normal relay while energizing the coil. Thanks to Edmund Scientific for providing the cool magnet viewer. This paper is so intriguing because it enables you to view the varying magnetic patterns of individual magnets. Take the obscure and begint “viewing” it like it’s magic. Great for educational demonstrations.”
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May 10th, 2007
This is so cool, I went to the vendor to try to buy some, but they’re out of stock
Guess I wasn’t the only one who had that in mind!
May 10th, 2007
I love stuff like this… Is there a practical app. for this?
May 10th, 2007
Bill: Damn D:
May 10th, 2007
I can think of a few… finding optimal placement of magnets in
things like generators, motors or electric guitar pickups. Also,
if you’re the type to make your own amps or cabents, you can
find if they’ve been properly sheilded.
May 10th, 2007
The looking for proper shielding is definitely an application, the relay that I tested to see if I could “see” it energize was an automotive type and I was thinking that it may have the spray on shielding inside. Turns out I could detect it energize so there is no shielding.
May 10th, 2007
I was just thinking, it may also be very useful for all of those DIY electro-magnet makers out there, you could probably make your home-made designs more efficient.
May 10th, 2007
Yeah, I agree with Joven, this would be great for working with guitar pickups.
May 10th, 2007
cool!!! that looks sweetTt!!!!!!
May 10th, 2007
Looks like it’s back in stock.
May 11th, 2007
Magnetic viewing paper
Hacked Gadgets reveals the hidden world of magnetization with magnetic viewing paper, Alan writes - We can’t see magnetic flux lines but with an inexpensive piece of Magnetic Viewing Paper we can easily visualize what we are missing. I…
May 11th, 2007
“It looks like the outer ring of the magnet has magnetic notches that are read by the electronic circuit. I imagine this is used for speed control, although this seems like a very complex method of regulating motor speed. ”
Actually, the motor is a many-poled permanent magnet rotor (the disk you’re looking at) working against a “coil” formed by the rectangular pattern on the printed circuit board. By pulsing the current through the coil pattern, the poles on the disk are advanced. It’s like the linear motors sugegsted for mag-lev trains, bent into a circle…
May 14th, 2007
Here is another place to get magnetic viewing paper:
http://www.kjmagnetics.com/proddetail.asp?prod=MV43
May 30th, 2007
A smattering of ketchup
Again, I’ll be transitioning to del.icio.us. But in the meantime, here goes:
An LED
flashlight—I’ve been meaning to make an LED worklamp, too.
A segment
on taking pictures covertly from the MAKE blog. Useful for
headcam/automated
July 2nd, 2007
[…] The video pretty much shows you everything you need to see to understand how fun and honestly, educational, this thing is. The 6yr old me would have loved this as much as the older me now wants to play around with it. If you want one, the mad scientist lab that is Edmund Scientific has ‘em. Also, there are more pics of this in action on Hacked Gadgets. […]
April 8th, 2008
Man I had some of this YEARS ago. Also the logo in the middle of the video is way annoying.