Instructables
video Magnetizer / demagnetizer
Surely magnetized tools have helped you many times, the best example is definitely a screwdriver. When you drop the screw in inaccessible location you can easily pick it up with magnetized tip of screwdriver. Even if not magnetized, it is very easily done just by touching the strong permanent magnet. And what to do when this feature bothers you, when you work in a small space, and small bolts and nuts keep sticking to the screwdriver tip? Continue reading and find out how to make simple device that will help you solve both problems.

Complete construction procedure of device mentioned above, and on video is available on my site
rimar20003 years ago
This device is very useful!
damirvk (author)  rimar20003 years ago
tnx
funonabun damirvk2 months ago
Well I did it worked for 2 secs then the coil overheated, coil was from a washing machine so don't know why it popped :(
mickjost10 months ago
i found the weak link in my setup was the coil. i tried to make my coil using wire and the case from 1/2" thread seal tape i didnt count how many wraps i made but it must have been to many because when i started it up it pulled all metal within 8" around it to the coil.it actually worked to well. although it was cool to see in about 2 seconds of being turned on is melted the hot glue and the case. is was just wondering if anyone knew of a formula or something to make this coil to max power but not instantly overheat.
mickjost11 months ago
this was my first time ever experimenting with electronics. this was a simple project. It took me a total of 4 hours to make this including learning to solder , reviewing the schematic over and over to learn what way the diode went(then seen the pics), and also used a multimeter for the first time. i live in North America and i i got my coil from a microwave oven turntable 120v 60hz. the page said the switch was an SPCO( single pole change over) . i learned the switch is also called an SPDT( single pole dual toggle) i found this at an auto parts store, it make be called different things in different regions or something.Diode was the same and just used a cheap extension cord for the main line to plug to the wall. the case ended up being the hardest thing to make. overall i would say that damirvk did a very great job on making this instructable. thank you very much for the knowledge and moral boost.
damirvk (author)  mickjost11 months ago
Makes me very glad that my post was so helpful.
Simple projects are best for learning, and this kind of comments are best reward for my effort.

BR
damirvk
KevinM1 year ago
Thanks for making this! I'd like to make one for myself, but I'm in the US. Would you recommend different component values for 120 V AC at 60 Hz?
damirvk (author)  KevinM1 year ago
Hi
You should find coil designed for 120V and that is only thing that is different from my design.
KevinM damirvk1 year ago
Cool, great! Thanks! :)
july19622 years ago
How long will it stay magentized?
Phil B3 years ago
I once used the core of a much larger old electric motor to erase cassette tapes. I had to be very careful to turn it "off" after just a couple of seconds, or it would draw too much current and overheat. What I really like about your design is the addition of the diode and the double throw switch so the device can be used to magnetize something, too. I have sometimes seen people wind insulated wire around a tool they wanted to magnetize and touch it briefly to the posts on an automobile battery. Again, the wires become quite warm after only a few seconds.
damirvk (author)  Phil B3 years ago
Yes you are right about heating, especially in magnetizer mode when DC current is flowing through coil. That is the reason why I use small power coil. After 3-5min it gets warm and that is more than enough for normal use in workshop.