Prewound Electromagnets

I want to make a wind turbine but I suck at coil winding. Where can I get prewound coils?

Posted by gimmelotsarobots 10 years ago  |  last reply 10 years ago


How to power an electromagnet? Answered

Is it better run an electromagnet of a bigger voltage(12V) with a smaller current(150mA) or with a smaller voltage 5V and a bigger current? Which will heat it up less? Does it even matter? The electromagnet will have to work for several hours so heat is my main problem. Also should I use thicker or thiner wire? I'm trying to build a electromagnet for a ferrofluid project.

Asked by odvratno.zgodan 7 years ago  |  last reply 5 years ago


Strange Electromagnet Observation

Hey everyone. I'm fairly new to the hobby electronics world, and today I decided I'd build an electromagnet. I wound my coil around a steel bolt, and I used 3 Duracell AA (1.5V) batteries for a power supply. When I turned on the switch, I found that my beautifully wound coil took a little bit of prying to get it off of the metal base I was working on. I thought "Let's try 9 volts!" So I grabbed a Rayovac 9V battery that I had around and hooked that up in place of the 4.4V (measured) bank. The Rayovac measured to be ~9V. The electromagnet was noticeably weaker. When I tested my magnet with just one of my 1.5V batteries, it felt like it had similar strength to the 9V battery.  Can anyone explain what might be going on? Short of that, could someone tell me how to measure the current coming off of each power source?

Posted by TheMike25 6 years ago  |  last reply 6 years ago


Electromagnetic and Magnetic Levitation

Hi! I am setting up a levitation system and need to estimate the amount of voltage and current that is needed for a 2" dia. coil to produce 4800 Gauss. I don't have any restrictions/requirements on the core, number of turns, etc as long as it would produce 4800 Gauss with a 2" diameter. How can this be calculated? (I have spent a lot of time googling for such information, but I am pretty confused and didn't find how to calculate this) Thanks!

Posted by J50Nunlimited 9 years ago  |  last reply 9 years ago


Microwave transformer electromagnet?

Hi so I was bored and decided to make an electromagnet out of a microwave transformer by taking the secondary off and keeping the primary. I hooked it up to some 9v batteries and stuff but it wasn't that strong so I researched it a bit and found out you can hook it up to the transformer input voltage (which was 240v AC) so I did but when I turned it on it made this very loud buzzing noise and I thought I saw what looked like flame in the socket. I turned it off imediately and unplugged everything. Whatever the magnet did must of been strong because it broke itself apart slightly. I tested the sockets with a multimeter and they still say 240v but I just want to make sure I didn't do anything bad to it. Also did anything actually go wrong or was this all meant to happen?

Asked by jlandreth1 3 years ago  |  last reply 3 years ago


2 Tesla Electromagnet? Answered

I need ideas for a 2 tesla electromagnet. I am trying to make the strongest magnet possible without additional cooling from a fan.. I don't know whether or not I can use high voltage, and low amps, or High amps, and low voltage. Or even inbetween.. Also, throw me that calculation for the electromagnetic strength. And if you could be awesome, explain to me how to use that formula, as I am not mathematically inclined. Thank you.

Asked by Justdoofus 7 years ago  |  last reply 10 months ago


Schematics to the Electromagnetic Floater?

Could anyone please send me the circuit schematics to the electromagnetic floater?(https://www.instructables.com/id/Electromagnetic-Floater/)

Asked by .Unknown. 8 years ago  |  last reply 8 years ago


Electromagnetic field generator

An electromagnetic field generator strong enough that can disturb the tv signal of your neighbour next door

Posted by SalemSnaKe 9 years ago  |  last reply 9 years ago


Electromagnetic Floater/Levitator? Answered

Has anyone tried building this electromagnetic floater, and had it working? Because I'm trying to make it, except it doesn't work for me....I don't know whether it's the circuit, or just me. P.S; Are most of the circuits on this website reliable?

Asked by .Unknown. 8 years ago  |  last reply 7 years ago


Building an electromagnet. Help anyone?

Hi all. I'm looking to mess with ferro fluid but I'm wondering exactly what kind of magnet I'm going to want.  From what I've looked up anything under 3000 gauss and I might as well get a rare earth magnet.  So obviously we move to electromagnets.  Basically what I'm looking for is help to create an electro magnet with these three criteria maximum gauss, minimum effort, and moderate safety.  I'd rather not have it get hot and burn myself.?

Asked by djvbb12 8 years ago  |  last reply 4 years ago


electromagnets to push objects without touching it

Hi, i want to make an electromagnetic coil which can push another metal plate without touching it from destance of approx. 50cm . max voltage allowed is 24 v.please suggest me way of getting electromagnet strong enough to push weight of approx 7kg without touching it.can you also suggest me material that can easily repel electromagnet?please help asap.

Asked by KiranS13 3 years ago  |  last reply 3 years ago


I want a powerfull electromagnet?

Dear friends, For my thesis, I need a strong electromagnet. How can I made it? It must be as strong as possible. Thank you so much. Best Regards. Reza

Asked by mbc711 9 years ago  |  last reply 9 years ago


Help with making an electromagnet Answered

It’s not as simple as it sounds I need to make it pick up things ( screws maybe screwdriver)and I need to be able to hide it somehow under my sleeve so I can trick people in to thinking I have magical powers.

Asked by zack.008 9 years ago  |  last reply 9 years ago


I need to make an electromagnet that continues to turn on and off (on 20 seconds off 45 seconds)

Hello, I am trying to make an electromagnet that turns on and off on an interval. On for 20 seconds off for 45 second. It would continue to turn on and off until the power is turned off. Any and all suggestions as to how to make (or buy) this would be great! I am making this for an art piece.. I am a glass artist so I am not well versed in any of this electrical engineering Thanks! Maia

Posted by MaiaS5 1 year ago  |  last reply 12 months ago


HELP!! i am building an using the magnet on the back of a car speaker.

I am also going to try to channel the electromagnetic waves. where should i start? How much energy would i need? How can i contain the magnetic field? at what point does the energy become harmful to the human body?

Asked by tprusak 7 years ago  |  last reply 7 years ago


what will be the wire size ?if i would like to make a eletro magnet ?which length could be 1200 mm and core width 40mm?

Dear friends, I want to make a drum with magnetic bars, to capture max matal particals from amixture, size of magnet should be 1200mm*---- ,suggest me what would be the Diameter of wire Regards Nadeem

Asked by nadeem Ashraf 6 years ago  |  last reply 6 years ago


Optical Image Stabilization

Hi everyone, I have a little awkward question here but I am sure someone who knows a little bit more about electronics can give me good advice. I took apart the lens from a consumer video camera and took out the Optical Image Stabilization module in an effort to figure out how it works and possibly hijack the signal so I can control the movement. In the camera this module is getting the signal from the accelerometer so it knows how to engage the two electromagnets and counteract the movement (shaking). What I have done is take the leads that go into it and try to fake what gyro sends to this element. So far I have noticed that when I short 1 and 2 or 3 and 4 the element goes to one side or up. So I put a potentiometer on it (2K ohm) and it gives me some control by turning the dial, but not good enough. Has anyone any idea how can I achieve a gradual movement of this lens element vertically and sideways with a slider or dial of some sort? Your help would be greatly appreciated!

Posted by Sudija 10 years ago


Electromagnet Help! How to Make a Small but very Strong Electromagnet???

I need you help smart people of Instructables!I need to make a small Electromagnet, that uses minimum power (by that I mean the battery), but still has to be very powerful. I have a couple of questions that I need you to help me answer:Does the number of coils that is wound to the metal bar effect the strenght of the electromagnet?Does the wire gauge (20,24,28,30,34,36 wire gauge) make a difference is the strenght of the magnet?Does the voltage I supply to the coil effect the Electromagnet?What type of battery is best for an Electromagnet (AA, AAA, C, D), and what voltage (1,5V, 3V, 4,5V, 6V, 9V) ???Here is the thing, I need to make the Electromagnet super strong but taking up the minimum of energy, for example, just 1,5V. The things that are not important to me (doesn't play a factor in my device) is the number of wire winds to the metal rod and the wire gauge! So is it better to just make 1 or more (3,4,5,6...) layers of wire winds???Is it better to use thinner (36 gauge) or thicker wire (24 gauge)???Thank you a lot!Stanislav

Asked by comodore 9 years ago  |  last reply 4 months ago


Wireless circuit diagram needed for an Electromagnet.

Hey guys, i urgently need to build a wireless circuit using a simple on/off electromagnetic circuit that would drop a metal object when the circuit is switched off. i have a 12V dc powered electromagnet as well as RF receiver and transmitter pair. the receiver needs to be fitted with the electromagnet and i would be using 4.5v dc power supply for the receiver using 3x1.5V button cells. Kindly help me with circuit diagrams and/or a list of other components such as generic IC/ timer 555/ resistors, capacitors, etc. which would be needed for me to build the circuit. Thanks a lot.

Asked by him1703 7 years ago  |  last reply 7 years ago


Can someone help me? My electromagnet wont work ):<

Hello! i'm kinda new to instructables, so plz don't get mad if i post something wrong... Anyway, my magnet is misbehaving. It just doesn't wanna move anything at all. That first image up there is my electromagnet :D (sry for the low resolution, my camera is more than capable of HD, I don't know why its blurry) How i have it powered is i'm running it off of a 5 volt AC charger. I know, I know. AC wont work for electromagnets. Well, that second picture that i got up there is a set of 4 diodes that makes the AC power turn to DC. I've got both ends of the DC power going to both ends of my magnets. Then I turn it on, and was disappointed to see that my magnet didn't like the way i made it and decided not to work. I've also got the wire insulated and an iron core, and am also trying to pick up iron nails, but to no success. not even a budge! Sry if i'm making this long... i'm just trying to give you all the information I can ;D (The current is also running through)

Asked by Dominolan 2 years ago  |  last reply 2 years ago


How can i make a (strong) electromagnetic wheel, so that when i give voltage it rotates? (in a bicycle)?

Plz refer me to some kind of web site that gives me this info.......

Asked by The Mak3rs 9 years ago  |  last reply 9 years ago


What can i do with non working electromagnet ceiling fans?

I've got a lot electromagnetic ceiling fans that don't work any more of which i don't what's the difference, if anybody can teach me of how will convert it to anything instead of throewing it

Asked by jovenhatsjr 9 years ago  |  last reply 9 years ago



How to power a strong Electromagnet?

I want to make a fairly strong electromagnet for general use but I also have a task in mind. I live in an apartment building near some students and someone egged my window. The egg dried in and now I can't reach it to clean it. I've see magnetic window cleaners before but they are cheap, weak and not up to task so I'd like to make an electromagnet to help with the scrubbing action. The windows are double glazed and the neodymium magnets I have are not strong enough. The only electromagnets I've ever made were the basic science experiment type, coiled copper around bolt with a battery to power. For this I assume I'll need a large battery or would it be mains powered? Any suggestions?

Asked by nodnodwinkwink 4 years ago  |  last reply 4 years ago


how to put into use some damage electromagnetic fan? Answered

I have a lot of ceiling fans that doesn't work anymore and i would like to convert it into something useful rather than giving it to recycle depots can anyone show what i can do about it.

Asked by jovenhatsjr 9 years ago  |  last reply 9 years ago


What is the relationship between the range of an electromagnet and its shape/size?

I'm thinking of building a floating globe sort of thing. How do I determine what size of electromagnet I should build? The globe itself would be fairly light, so the strength at range would not be much of an issue.

Asked by MaximY 2 years ago  |  last reply 2 years ago


Maglev Train using Electromagnets

I have made a simple maglev train, using Electromagnets. It uses repulsion. and everything is working....except Propulsion. How can I propel it? I can remake the project if required.

Posted by NHarmonia 6 years ago  |  last reply 6 years ago


Electromagnet Trouble

I'm in the development stages for my entry into the Launch It contest. Right now I'm just experimenting (or trying to) with scale electromagnets. I'm using solid core insulated copper wire from RadioShack, and a nearly fresh 9v battery. I tightly wound the wire around a finishing nail, which happened to already be magnetic, but am not getting any improvement in the magnetic field. It seems to be the same, weak size. Am I doing something wrong, or do I just need to step the size up? Thanks!

Posted by Bran 11 years ago  |  last reply 11 years ago


Magnetic Field for hollow core?

I am working on a project in which I have to control a small setup at the end of a motor shaft using an electromagnet. The electromagnet needs to be around the shaft inbetween the setup and the motor. So I have used a metallic ferromagnetic spool(image attached) and wound 32 gauge wire on it to make it an electromagnet and put the shaft through it. Since this core made out of spool is hollow, I'm not sure how the magnetic field will behave. I tried powering up the one I made and it' seems to be both attracting and repelling a magnet's pole (edges attract while centre somewhat repels). Anyone got any idea about this?

Posted by Antzy Carmasaic 6 years ago  |  last reply 6 years ago


Any suggestions on a good power source for an AC electromagnet?

I am building an AC electromagnet as a part of a science project. I'm unsure of what to use for a power source that will safe and function properly. The end result of the project should cause a metal ring to "jump" off of a pole and into the air.. To do this, I need to be able to charge the coil (it only needs to charge for a second, literally). So, if anyone knows of a source with some type of on/off switch or button, that would be great, but I am open to any and all suggestions!

Asked by Becky197181 6 years ago  |  last reply 6 years ago


Hi, I need to make a 2&quot; x 2&quot; strong electromagnet, enough to pull a 0.5 kg body placed about a meter away from it?

I want to know the core and the wire to be used?. And the minimum battery rating, I can use upto 12 v or 2 batteries of 12 v. Please help me.

Asked by usamasiraj 9 years ago  |  last reply 7 years ago


Would it be possible to generate at least 9V with a small ElectroMagnet Generator?Please help!?

Im thinking of powering a 9V computer Fan with a little motor I pulled out of a old RC car. How much voltage do you think would it be possible to pull from that motor if say the motor uses a 12V battery to run at full speed?What do I have to do to pull max potential out of the motor. Its a science project that im doing for myself and maybe later on will become a fixture in my home. Thanks!

Asked by Cartman007 9 years ago  |  last reply 9 years ago


creating movement- pulsed coil magnet? other ideas? and how to accomplish?

I'm wanting to swing a small pendulum around (randomly would be nice).  I'm figuring something like is inside this candle would be the best method: https://www.youtube.com/watch?v=XM1c9Ny3X8E However, I don't know where to buy or how to make this (I can make a wire coil, but not program a chip to turn power to it on and off).  The candles are too expensive to buy to take apart.  Does anywhere happen to sell just that piece?  It would be great if I could just buy it, hook it to my 3v power, and I'm all done. Or does anyone have other ideas? Thanks.

Posted by aliasjanedoe 4 years ago  |  last reply 4 years ago


Electromagnetic pulse generator plans?

Does anybody know where I can find plans for an electromagnetic pulse generator?

Posted by abun1991 12 years ago  |  last reply 5 years ago


Earth magnets vs Electromagnets ? Answered

If I have an earth magnet in my pocket but I want a more powerful magnet would an electromagnet be more stronger?? Thanks. AL.

Asked by alsports2000 7 years ago  |  last reply 7 years ago


How to measure electromagnet by Tesla?

I will be doing an experiment how powerful the magnetic field of an electromagnet, and my guess is the more you twist the wire the more power it generate. But i don't know how to measure the magnetic field by using the unit Tesla.

Asked by defineSCIENCE 2 years ago  |  last reply 6 weeks ago


Earth Magnets vs Electromagnets?? Answered

I have an earth magnet/ neodymium magnet that is pretty strong as far as pulling power is concerned but would an electro magnet have more pulling force or power. Its a small enough earth magnet that fits in my pocket. Thanks. AL.

Asked by alsports2000 7 years ago  |  last reply 3 years ago


Layers V.S. Length; Electromagnets ? Answered

Ok, so I am going to be working on a project that involves electromagnets and the on thing I have never gotten straight is this: To make the most effective magnetic field possible do I make the (hypothetically) 100' of wire a long coil with only a couple of layers or 100' of wire a short coil with many layers? I have always come across conflicting views on if length improve the fields or weaken them. Any insight would be helpful and if you could also provide a good reference site for these types of questions that would also be appreciated. 

Asked by Jayccob 3 years ago  |  last reply 3 years ago


electromagnetic pinch effect demonstrator

Greetings, Instructors! I've done some searching in the Technology section already, but (as you know) it's huge, and I didn't see anything that was close enough to what I'm looking for except the electromagnetic coil gun. I want to replicate a demonstrator I saw, once upon a year, at the Smithsonian Institution. A thin-walled metal tube was dropped into the spaces inside two stacked, separated coils, as if it were an axle for a pair of wheels. A brief, large current was then run through the coils; the induced currents in the tube produced the "theta pinch" effect, crushing the regions of the tube that were within the coils. (The machine was set up to sell the products for a token price; the impressively crushed tube was dispensed as a souvenir.) I need advice on the type and capacity of capacitor, thyristor, power supply, etc. to employ. Has anyone here built one, or know someone who has? Thanks!

Asked by Argent47 4 years ago  |  last reply 4 years ago


can you make two electromagnets attract?

Just wondering. because they are like permanent magnets when used right? and can you make them repel? cause that would be a cool point maglev system

Asked by bufalloo 9 years ago  |  last reply 9 years ago


how far can an electromagnetic field reach?

For my project I need to know how far electromagnetic fields can reach. I am guessing its related to power and materials, but perhaps there is some kind of rough formula for calculating potential reach? By reach, I mean, how far can the magnetic field reach and attract (move) something, like metal fillings. Also, is there anyway to know how quickly a magnetic field can move something. In other words what speed will metal fillings move at when the electromagnet is switched on? Thanks all, Joel (the snow athlete)

Posted by snow athlete 9 years ago  |  last reply 9 years ago


How long will a 9v battery hold electromagnet lock closed Answered

I want to make a hidden cabinet, locked by a 5w electromagnet, but only powered by a single 9v battery, my question is well it work and how long will it last.

Asked by krayzeesmoke 4 years ago  |  last reply 4 years ago


Can you use standard choke inductors as electromagnets?

I am making a project where I need very small electromagnets to attract and hold a small metal flap closed when the circuit is turned on. Flap is about 1cm from the magnet and returns to this position via a spring when the circuit is off. In theory is it possible to use inductors used in electronic circuits (for interference suppression etc.) as an electromagnet? Thanks.

Asked by laquermonkey 9 years ago  |  last reply 9 years ago


Can I make a portable electromagnet that will support my body weight? Answered

I would like to make a couple of electromagnets that will support my body weight, I'm about 75kg, the idea is climbing along underneath bridges ;) Is it possible? What sort of batteries would I need? I hope you can get what I mean. Thanks Jamie

Asked by frazzlemydrive 9 years ago  |  last reply 8 years ago


Electromagnets, I'm wanting to make a magnet powered by a 1000W computer psu? Answered

How can I make a electromagnet that is powered by the 12v line on a 1000W psu from a PC? It needs to be as small as possible, it also needs to be as strong as possible it needs to carry around 200gr of weight, and I'd like to have it on for arround 2-3 hours without any possible dangers. Please explain me as much as possible?!

Asked by trucker her 8 years ago  |  last reply 8 years ago


How do I properly power my electromagnet?

I just purchased an electromagnet from Amazon for a small prop for an upcoming play I am directing. Now my problem is... I do not have a clue as to how to supply the power to it. It needs to be able to run steady for roughly 3 hours.  What size batteries would I need -the smaller the better in terms of size since the prop itself is not that large,  ut will do whatever is necessary to function properly. Here is the only information the electromagnet had attached to it: 'Feature: Electric lifting magnet Powerful and compact Smooth and flat surface Low consumption and reliable Applications: assembly line, sorting machine, mechanical arm, experimental facility, etc Specification:Material: Metal Input Voltage: 12V DC Lifting Force :20N Overall Size : 15 x 15 mm /0.6 x 0.6 inch(Dia. *T) Thread DIA : 3mm Lead Length : 24cm/9. 5 inch" Any help would be greatly appreciated. Thank you in advanced!

Asked by DeanB77 1 year ago  |  last reply 1 year ago


Can pulse width modulation pins on arduino noticeably affect the strength of an electromagnet? Answered

I am currently designing a project in which two electromagnets cause a small metal object to levitate between them, and am trying to create an interactive interface in which gestures on a multi-touch trackpad cause the object to levitate higher or lower. My question is, is it possible to use an arduino's pulse width modulation to significantly alter the strength of an electromagnet in order to move an object at a noticeably varying distance from the electromagnet?

Asked by ALogan97 6 years ago  |  last reply 6 years ago


How do you make an electromagnetic crane?

I need to make it with the help of 2 motors of DC 9V each and batteries which can range from 3V - 9V which can move about its axis and pick up a small amount of weight. Need it fast!!!

Asked by Ananthu007 7 years ago  |  last reply 7 years ago


Electronic catapult?

Okay. I'm going to make an electromagnet to hold the spring in place while it's compressed, and then as the power turns off, the spring will release and shoot the catapult. However, I'm not an engineer-- I'm making this for tech class. How should I design the catapult so that this will work as a triggering mechanism? In what way should I set up the spring and electromagnet relative to each other? Thanks in advance.

Posted by camiheall 3 years ago  |  last reply 3 years ago


Help with electromagnet

I have made an attempt to make an electromagnet.I got a 10 inch iron rod with insulated copper wire wrapped around (see image)I didnt have enough wire for the whole rod, so the wire is in two seperate sectionsI tried a AA 1.5v battery, two AA 1.5v, a 9v, two 9v and a big 6v plugged in both ways (negative, positive).None seem to work.I thought it may be the two sections connected together, so i tried all the above batteries again on only one section, and it still didnt work.Can anyone help me out here ?

Posted by oxidase 9 years ago  |  last reply 9 years ago