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Old 10-10-2010, 01:46 PM   #31
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any other place's to get magnets ??
The laser assemblies of cd and dvd players have small ones, quite strong for their size.

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Old 10-17-2010, 07:05 AM   #32
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Why they could not get her old data off it I do not know, but that's a topic for another thread.
(OT) Files may be in pieces stores in different areas of the disk. Imagine a library where all the volumes of an encyclopedia or other set were stored on different shelves and the card catalog was destroyed.

In addition the file's name is kept only in the index or "card catalog".
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Last edited by AllanJ; 10-17-2010 at 07:07 AM.
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Old 10-27-2010, 07:43 PM   #33
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I have put a magnet on the bottom of the oil pan for years. It also helps with something else that I love it:
Some of us may not pay attention that when we stop at the traffic lights, there are loop wires buried under the asphalt surface as shown in this photo:


(Copied from http://www.instructables.com/image/F...he-Problem.jpg)

The magnet helps to turn the red light to green faster. Your waiting time is shorter. You can googling "traffic light trigger" to read the explanation, or read here:
http://www.instructables.com/id/Trig...raffic-Lights/

My own words may not be so clear to you. You will see the difference! Good luck!
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Old 11-05-2010, 08:47 PM   #34
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Originally Posted by huynh View Post
I have put a magnet on the bottom of the oil pan for years. It also helps with something else that I love it:
Some of us may not pay attention that when we stop at the traffic lights, there are loop wires buried under the asphalt surface as shown in this photo:


(Copied from http://www.instructables.com/image/F...he-Problem.jpg)

The magnet helps to turn the red light to green faster. Your waiting time is shorter. You can googling "traffic light trigger" to read the explanation, or read here:
http://www.instructables.com/id/Trig...raffic-Lights/

My own words may not be so clear to you. You will see the difference! Good luck!
It clearly says in the video this is only for motorcycles. However, that's only the beginning. Modern traffic lights do not use inductive loops to trigger them. They are either timed or they used sensors on the light itself.

Beyond that, I don't buy the magnet trick in the first place. All it's doing is increasing the electromagnetic field to make the light realize something is there, the same thing it would do if 1 car pulled up. Lights don't change when 1 car pulls up, either.
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Old 11-15-2010, 02:12 PM   #35
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It's funny that I just randomly came across this thread. Last week a friend of mine was destroying an old computer and when I asked him why he explained that he was trying to find a really strong magnet. I was confused at this point, but a little while later voila!! Such a great random fact of knowledge for everyone to have!!
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Old 12-08-2011, 01:49 AM   #36
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An old 3.5" floppy drive has 2 strong magnets in it also.
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Old 12-10-2011, 03:36 PM   #37
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magnets are cheap and plentiful online, shipped direct to your door. i bought some for a crazy project i was building some time ago, they were incredibly strong. literally jumped out of my hand and smashed into my car door leaving a big mark. the jump was from 6" away. these things are dangerous.
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Old 01-11-2012, 04:49 PM   #38
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Ya if you've got hard drives laying around that you aren't gonna use. Strong is for sure!! Those things are powerful!
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Old 01-12-2012, 10:18 AM   #39
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Check for discarded CT scan machines at the local scrapyard...

Maybe not...

Nice tip- I have some drives laying around...
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Old 01-12-2012, 10:23 AM   #40
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Since this has been bumped. The magnets inside the hard drives are neodymium (rare earth) and can be dangerous to play with, simply because of their strength. I recently read where a child swallowed 2 and ended up with their intestines being pinched and causing necrosis of that section. I have also seen some nasty blood blisters from pinches caused by these. So take caution when playing with them.
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Old 01-12-2012, 12:29 PM   #41
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I'd be careful poking around in microwaves if you don't know what you're doing....

DM
Watch out for capacitors, even unplugged they can hold a healthy does of current!
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Old 01-12-2012, 06:59 PM   #42
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Every Sonicare toothbrush head has two small magnets in the end that is inserted into the battery case. They are quite small but extremely powerful.
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Old 03-04-2012, 12:09 AM   #43
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How do you build an alternator out of them?
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Old 03-09-2012, 01:38 PM   #44
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I just broke open a 160Gb newer drive and it's magnet is not like the older ones. You can tell just by picking up the drive because of the weight. Heavy is good for strong magnets. The newer drives are more energy efficient, not so good for magnets. dorf dude...
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Old 03-09-2012, 01:48 PM   #45
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So really I need some of those amazing *new 1MB drives, the ones you get in trouble from your parents for doing a full installation of the original Warcraft on? (Ah, those were the days...)
I work with a local organization called Free Geek (freegeek.org) and I can surely get what I need there. Thanks for the advice.

Any idea which directions the poles act in?

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