Picture of How to make your own Metal Pulse Magnetizer
Four weeks ago I was searching for an magnetizer that can revive my dead magnets (I killed them heating up at a high temperature, trying to encapsulate in a piece of glass), but I haven't found a instructable project that can help me, so with physics teacher's support  I made one that works.
With it's help you can revive dead or old magnets, or you can magnetize things like screwdrivers, nails, paperclips, or any metal which can be a good magnet.
It looks like a game console, isn't it ?
This device is only a PROTOTYPE, so maybe I will try to make a big one that can magnetize your hammer.
Now let's start the work.

Step 1: Materials

Picture of Materials
The materials you need for this project are:

- a 1N4007 diode
- a DPST switch (I get mine from an old computer)
- a Push button switch (or how it is called)
- a jack and a capacitor(230 uF and 400 V) from an old power supply unit
- a plastic, wood, Plexiglas, or any material you found, but NO metals like iron, steel, aluminum, copper or any metal that are atracted
by magnets.
- a 15 W, 220 V lamp
- copper wire for making a coil (0.6 mm diameter for 800 turns)
- something on you can spool your coil (I use a plastic support from solder with inner diameter 20 mm [don't use something that have the inner diameter bigger than 20 mm because then your magnetizer will not work])
- a cable for your jack (I use an ordinary cable for PC supply), why I use it ? because it can be removed.
-two plastic panels (I made them because my case needs panels )
- 20 cm of thick copper wire (2-3 mm diameter) 
Watch out how you handle the capacitor. If it is charged, and you touch it, you can die.
Try to make the capacitor's links with push button switch and with coil as short as you can,
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Does it only magnetize iron?

andreyeurope (author)  atlanteanscion4 months ago
Only iron nails and iron screwdrivers I had then, but I think this article will tell you more than I can.
LimingZ9 months ago

I would suggest the usage of a GFCI receptacle to improve safety, even for prototyping.

MarkT79 months ago

With regards to the tip on making the coil, "Be careful when you make the coil because if you let the wire from your hand, you must start again"... I'm not sure what this means... the above instructions give no explicit direction for how to make the coil in the first place, so I'm unclear how is it supposed to be built without using your hands. Between that and the fact that the photo appears to show someone touching it with their finger, I'm very uncertain what is being said here.

andreyeurope (author)  MarkT79 months ago
I meant if When you are making the coil, be careful in order not to let the wire go, because if you let it go, you will need to start over,
Making a coil is really easy, you need a certain type of wire that depends on what you want to do with that coil. If you intend to learn how to make a coil, you can read this article.
I'm sorry if I confused you.
Have a nice day.
yveg2 years ago
Please e-mail me if you can help.
yveg2 years ago
I would like to have a very small emp device. I am willing to pay for all the expenses. Please let me know if any of you can help.
andreyeurope (author)  yveg2 years ago
OK. I will research a little about mini Emp, but tell me, what do you wanna do with it ?
Any chance you can make a demagnetizer? I have this huge magnet that magnetizes anything it touches. Not very much, but enough to cling to things and get annoying.
andreyeurope (author)  AlbinoMoose3082 years ago
Maybe I'll make one just for you. You could demagnetize almost every magnet heating it.
nerd74732 years ago
I love magnetism
mbrito12 years ago
Hi, I`m sure that in digital scope you have the option to set a specific level of tension in the trigger, that capture a screen from that moment (single capture ore something like that), but I don`t remember if exits the same in a analog one, take a look at the trigger options.
andreyeurope (author)  mbrito12 years ago
I don't think it have one. That oscilloscope wasn't very expensive, so I don't think it have something to take a snap.
Treknology2 years ago
Imagine the pulse you could get using the transformer and capacitor from a microwave oven...
I am still angered at how many people have negatively criticised this project. The author is a school student and this is only his second project. We all had to start somewhere. Even if the capacitor is rated at 400V, it is never going to charge beyond the mains voltage of 220-240V. There are many un-earthed appliances that rely on plastic insulation to keep the electricity inside, among the most dangerous being hair dryers and hand-held kitchen mixers.

Yet no one has mentioned just how dangerous my suggestion above would be!

1. The capacitor, on average, is capable of holding 3kVDC maybe even as high as 5kVDC. It would have to remain properly housed in the modified microwave oven just in case it exploded.

2. The button to dump the capacitor into the magnetizing coil would have to be a very heavy industrial switch----if a 'domestic' switch did not start arcing almost immediately, the contacts would probably weld together into a short circuit on its very first use.

If you must "criticise", then please use the "be nice" policy. Why would andreyeurope want to post a third project if it was only going to attract the same negative responses?
Mr Treknology, please stop trying to teach when you obviously know very little about mains AC electricity.

I have to be firm about this for everyone's safety, including yours.

Any home-built mains powered circuit should be checked by an electrician or properly qualified person for safety BEFORE it is connected to the mains supply.

On 250 Volt AC mains, the capacitor will charge to 350 Volts.

A capacitor must never be charged above its rated voltage.   It is liable to explode.

But you are correct about the requirement for a high current switch.

Please read the entire thread(s). The safety and voltage issues have already been corrected.
Actually, he is safer than that as the cap only sees half the wave, so 110-120V peak, with an average DC voltage that is lower. So no issues there.

Only thing might be need to watch is the diode as it's rated at 1A max, but should be okay, a fuse would be a good idea though.
What a load of croc.
220-240v peek Sinusoidal Alternating Current Halfwave Rectified = 310-330 volts DC.
As this particular thread is aimed at the "be nice" policy, I am offended that you have "corrected" Indy_Rider with an opening line, "What a load of croc."

Yes, the capacitor should eventually reach a peak charge in the 300VDC range. No, your language is inappropriate.
Your Right!
Im sorry.
Some comments are dangerous, I felt I to make an impact on that kind of croc. A lot of people dont realize small mistakes like that will put you on the Darwin awards. Not that most people still wont touch 110v.

Thanks for your comment
A fuse only protects the equipment, It surprises me that no one except me is saying just use an RCD, they trip with any earth leakage above 30mA (normally)

General safely like make sure the wires you use are rated for the voltage, is just standard practice. this protect (in my country) would run on 230V and CB's and fuses would be rated at 16amps, you would be dead many times over and they wouldn't even notice. At the end of the day most people on this site aren't electricians, we need to make sure these people are safe. RCD's is what you need.
Where I live, ELCBs are a standard requirement. The only household circuit exempt is that supplying the refrigerator and freezer.
dealowis2 years ago
its a great idea, my family member love it :D
andreyeurope (author)  dealowis2 years ago
Thank you, Dealowis.
tolstoyan2 years ago
i seriously going to build this, just one question what did you use to cover the coil? the black thing in the picture hehehe
very nice project though.;
and also can i add 50 more turn to the coil is that okay?
andreyeurope (author)  tolstoyan2 years ago
It's ok adding 50 turns. The black thing is the coil covered with tape.
will that add the magnetizing effect?
andreyeurope (author)  tolstoyan2 years ago
What do you mean ? If you would say that it will do the same job, yes.
i already bought the materials needed, ill post you some updates with your projects hehehe
bosherston2 years ago
Pretty tricky to do if your camera doesn't have a "B" setting (open shutter).
You have access to a video camera, may I suggest another vid clip? Grab the frame that shows the pulse.
Nice project btw. You have done the proof of concept, how about looking at any criticisms and see if there's anything you could work into v2.0?
andreyeurope (author)  bosherston2 years ago
Now I'm working at my magnetic stirrer V2.0, but in the near future I will also make the pulse magnetizer v2.0.
I will think of making a new video. By the way, the photos were taken with a smartphone camera.
Thank you.
Yes I saw the stirrer, great work there too, so I look forward to V2.0.

Another covering idea for the magnet would be to smother it in bathroom sealant silicone - probably even more inert than hot glue?
You could make a mould out of a biro tube or similar, pump it full of silicone, insert magnet, top up with more silicone and when set gently break out of the tube and trim.

" ...photos were taken with a smartphone camera."

Ah but if your video was taken using your smartphone too, then it's even easier to grab an image that captures that pulse spot-on. Just an idea if you need to capture a transient event. : )
I forgot to add - go colourful and use Sugru.
UKTech2 years ago
This appears to be sooooo dangerous, I can't believe a teacher was any part of this project.
No fuse on a mains project, things stuck with glue instead of being fixed properly, items being thrown out, I could go on and on.
Please amment this project before someone get hurt or worse.
I admire you for having a go but this project wants building properly.
The only "Dangerous" thing I see here are all the comments putting down the Author. I could point out MANY projects that have had a "Teachers" insight and/or input. I should think that you've thrown out your cellphone, I-Pod/Pad and any other devices that require 5VDC chargers(as I've yet to see such a charger that has a fuse on/in it). and PLEASE don't tell me that you've NEVER replaced a burnt out lightbulb without making 100% sure that you've pulled the fuse from the MAINS panel or triped the Breaker on said MAINS panel!

I couldn't POSSIBLY count the number projects that involve electricity and HOT GLUE; It holds fast when it returns to a Solid AND it does not conduct.

"fixed properly, items being thrown out"

...the only thing I see being thrown out is your poor use of English; the word is "Amend" not "Amment'(please change the spelling of your criticism..." before someone get hurt or worse".

The Author had a need and came to this site for help. He/She was forced to look elsewhere and sought out a teacher who was able to assist. The Author then took that teaching and put it to use to complete the answer to the question asked. FIRST we get the Basic idea made into a working thing...THEN we see what can be done to make it Better. I don't see any Instructables under your Nick...lets see YOU do better.

The Instructable is simple, fairly safe(if ANYTHING is going to blow...it'll be the inline lamp!) and serves its task very well. I give the project 8/10!
andreyeurope (author)  your_dragon1132 years ago
Thank you, Your_dragon113
A fuse probably would be a good idea but as the electrics are all inside an insulated case, I think some of the safety "concerns" are a little over-cautious. After all this IS a prototype.
Actually, an insulated case can make things more dangerous. I know this sounds counter-intuitive. Imagine if, somehow, electricity goes outside the box (a failure in one of the switches or a breakdown in your coil insulation, are two examples which come to mind). Then the electricity will sit there, waiting to choose the person as its path. A conductive housing which is connected to the mains ground is much safer. Of course, you should fuse the mains supply as well. Fuses are cheap and can be replaced.
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