Introduction: DIY Super Electromagnet

How to Make a BIG and Powerful Electromagnet with the Primary of the transformer of a microwave oven. Remove the Secondary. With Iron or Steel (ferromagnetic materials) it attracts with a really great strength. With non ferrous metals like aluminum and copper it repels them due to Eddy currents.


PeterK2 (author)2016-08-03

Quick question, could you cut off the excess ends of the "E" to lighten it?

bubal (author)PeterK22016-08-04

It is possible, but I don't know how much, because the E does an important function. Increases the magnetic permeability so the magnetic field is channeled better in one direction.

Dashing Rainbow Dash (author)2016-04-19

How hot does it get, and could I cut the excess ferrite off the transformer to make it lighter?

SyP2 made it! (author)2016-01-02

Got it! Strong enough to lift itself using a hammer like in the video.

Here's a couple photos of my setup, and my ad-hoc DC power supply to run it without blowing the wall fuse.

It's a 12 V rectified DC power supply using about $15 of Radioshack stuff I had in my office.

1. Connect the white wire from a wall plug adapter one of the two black input wires of a Radioshack 120VAC to 12.6VAC transformer (about $12).

2. Connect the black wire from the wall plug to a 4A 125V 5x20mm fuse ($0.50) between and then to the other black input on the Radioshack transformer (the black input on the same side as the first black input above).

2. Connect the two yellow output wires to the "~" inputs on a Radioshack 400V 8A full wave bridge rectifier ($3).

3. Connect the positive (+) output of the bridge rectifier to one of the primary coil electrodes on the microwave transformer/electromagnet.

4. Connect the negative (-) output of the bridge rectifier to the other electrode on the primary coil of the electromagnet coil.

5. Plug in your AC plug to a power strip with an on/off switch.

6. Switch it on and enjoy the Electromagnetism!

7. Study Physics and do science!!!

eyejuice (author)2015-06-03

How long can you keep the magnet on without tripping a breaker? Have mine hooked up to a power strip which trips after a few seconds. Tempted to plug directly into a wall outlet but i dont want to risk overheating the coils.

dmalamas (author)2015-03-10

Hi, could you tell me what is your input source (voltage value) and if this electromagnet works with AC (50 - 100 Hz) input?

Thank you

bubal (author)dmalamas2015-03-10

230 volt 50 Hz. But if you live in a 120 volt 60 Hz country you will find microwave oven transformers that work with that values so it is more or less the same.

dmalamas (author)bubal2015-03-10

Thank you very much..

artist10 (author)2015-02-03


What did you connect the wires from the primary core to?

HoboTeaParty (author)2014-08-26

What is the rating on the transformer you used for this?

bubal (author)HoboTeaParty2014-08-26

I dont know. 230 V, 2000 Watts

cpallette (author)2014-07-15

How strong is it?

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