Hi There! I have here a transformer from an old UPS (Belkin 550VA), I just wondering if I can use it as a battery charger, my problem is I cannot locate the PCB connected to it. Available information I have here are in one side there are 3 wires Blue, Brown & Red on the other side Black, Red, Brown, yellow, Blue. It is also labeled on the top 080-48172-00 GP 0751 Class B Viking B-2 E210832 Can someone help me with this little project? Thanks in advance! Jayce 

Posted by jayce_sos 7 years ago  |  last reply 4 years ago

Transformers + )

I think that the transformer speaks for itself. In case you don't understand it's language, it's saying, "I am AWESOME!!!!!"

Posted by Mepain 11 years ago  |  last reply 4 years ago

transformer? Answered

 i got this thing form a TV circuit board. It has five pins and has a trimming option on top and looks like a transformer.   i don't know what its use is. please help me find its use in the circuit, can i use this in any other circuit

Asked by sooraj619 7 years ago  |  last reply 7 years ago


Hey guys this is rush... i want to make a high voltage power supply made from a charger and a trans former this is how i'm planing i will connect the output of the charger to the real output (where the plug is connected ) of the transformer and connecting the real input (where it originally lowers the voltage) meaning to say  output(ch)--->input(trn) the output of the project is the real input of the transformer  guys pls. help me as fast as you can  tnx - ~_~

Posted by crazy lazy man 5 years ago  |  last reply 5 years ago

Lego transformers

All lego transformers

Posted by ASH9810 3 years ago  |  last reply 3 years ago

Knex Transformers

I set this forum up for people to post their own transformers pics. I am working on 2 new transformers pics and will post them here if anyone else has any there working on or finished ones that you want to post, you can put them here

Posted by glitched9700 11 years ago  |  last reply 7 years ago

Knex Transformers

I'm new to this website and ive seen a lot of great posts for some transforming knex especially one that resembles optimus prime (not the large one that the creator refuses to post a smaller one) i was just wondering if anyone would be willing to post more instructables of their designs keep up the work folks.

Posted by alabasterinstruct 7 years ago

Knex Transformer

I made this knex transformer, and it does not come apart anywhere in the transformation HOPE YOU LIKE IT.

Posted by battlefront1 10 years ago  |  last reply 6 years ago

Nst transformer?

How do I find out how much current my transformer can drive? How do I compare the drive of my transformer, and what's the purpose?

Asked by wiccakingkamui 5 years ago  |  last reply 5 years ago

DC transformer? Answered

Transformers work with AC power, but can you use pulsed DC power to run one?

Asked by Jimmy Proton 8 years ago  |  last reply 8 years ago

transformer needed

I need at least one working five pin transformer.  If you have a reply please show a picture.

Posted by dangerUXO 7 years ago  |  last reply 7 years ago

Transformer in a CFL? Answered

I found this inside a cfl(image uploaded).See that tiny transformer in it?Please let me know if its a step up or a step down transformer and its output and input volt(which I think is 220volt).Thanks in advance!

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

make a transformer? Answered

I am wondering how to make a homemade transformer for an early tesla coil (the kind with the flat primary and secondary coils). Thanks in advance, Josh1324

Asked by josh1324 7 years ago  |  last reply 7 years ago

Transformer help. Answered

Ok, i am trying to build a charger for my coilgun science project and was wondering if there was a way to hook up a transformer WITHOUT winding any freaking coils. Most help works, thanks.

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

Transformer coilgun

Hey i use a camera circuit for my coil gun and the circuit would always burn out so i was wondering if it is possible to just use a audio transformer and if so how please.

Posted by Kante Tech 8 years ago  |  last reply 7 years ago

New transformer.

Here's the new transformer that I am making with only one set. Sorry for bad pictures (webcam), I have no batteries for my real camera.

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

Transformer modification? Answered

2 questions about transformers: - If a certain transformer (let's say, for a power amplifier) is needed, and for example, a microwave transformer is available, can the steel frame be cut to take out the secondary coil, to be replaced by a new one, and subsequently be re-attached (by clamps or so)? Would it need some treatment, like putting varnish, or oil over it?  Would this cutting and re- attaching cause a loss in efficiency, or cause heat build-up? Would it cause more noise in the output? - Some amps have a toroid transformer. Is this just fashionable or is it for a reason? Some industrial amps use sheets of copper instead of wire. Why is this better for industrial, why, and if not for common stuff...?

Asked by BobS 8 years ago  |  last reply 8 years ago

transformer design... Answered

Designing a transformer, currently i have a 250mm by 250mm window for wire and interchangeable coils, some only a few turns, but will leakage flux cause large power loss?, or will it just limmit current, i read some stuff and im not really sure, i mean i don't want to start building it if it won't work

Asked by pwnag3 7 years ago  |  last reply 7 years ago

Transformer not behaving...

I hope someone here can help.  I have a AC to AC step down Unrectified transformer, i.e., no circuit board whatsoever.  Primary winding has continuity, secondary wire has continuity.  No continuity between primary and secondary wires in any way.  In short, power goes in, but no voltage comes out.  If someone that knows precisely how transformers work can explain to me how a magnetic field can be generated but no electricity generated on the 2ndary wire I would appreciate it.

Posted by PeterE56 2 years ago  |  last reply 2 years ago

Microwave Transformer

I have salvaged a old microwave transformer that i am going to use for a SLA battery charger i am building. I have rewound the secondary with 50amp wire and i get an AC output of 12v what is what i want but im confused with working out how many amps it puts out. I have run it through a bridge rectifier and a capacitor and i get about 18V DC. I was testing the amps by adding 12v 50watt light bulbs to it 1 at a time and when i get to 200watts the voltage starts to drop to about 10v DC. My question is does that mean the transformer is being overloaded? and if so is there a way to increase the amp output by winding secondary with different wire? I have seen online videos of Microwave transformers being rewound and they give out 50amps at 12v.

Posted by JamieG14 3 years ago  |  last reply 3 years ago

Transformer question?

I took a part an ooooold boombox and got some cool parts from it, one of them being a heavy, good-sized transformer. The boombox was using the transformer to step down the voltage before rectifying it.(Right before rectification it goes through a 500mA fuse if that helps...) From what I can tell, the mains power is connected directly to the transformer. I tested it with low voltage AC source and found that it is roughly a 10:1 ratio transformer. I wanted to reverse this and use it as a step-up transformer, but I don't feel comfortable hooking it up directly to mains in case it draws too much current and flips a breaker or something (I read a biography of this one dude and when he was a kid he tried to make an electromagnet using mains power.... knocked out the power on the whole block and the police came...). Will it draw too much current putting it on the low voltage side? I saw one guy say that using a 50 ft extension cord will prevent it from drawing too much. Will that work? If not any other ways? (or just not worry about it?) edit: It is roughly the same size as this one

Asked by 7654321 7 years ago  |  last reply 7 years ago

Homemade Transformer?

Hi, Moved over to the UK from the US a couple of months ago and my fiancee has brought with her a 110V tea-steeper with her.  Apparently it possesses magical properties that cannot be reproduced by other local appliances.   It will blow out the fuse in a 500-watt transformer, which is the largest that I have.  My question is, why are these things so expensive?  I have very limited knowledge about them, but from what I do know they don't seem that complex.  Some of the higher wattage transformers are the same price as a netbook computer!  What is in them that costs so much? Also, can you make your own?   Thanks -Andrew

Posted by knightop 8 years ago  |  last reply 8 years ago

Transformer Technicalities?

Hey guys I need some help from the experts. I am building the microwave transformer ark welder instructable. I have acquired my microwave transformer, and rewound the secondarys. Now here's where it get interesting. I stay in South Africa, and we have 220v, 15amps coming out of the wall. So I figured with so much wall power I probably only need one transformer, cos I already have too many amps (on paper). So from what I understand, I will be putting 3300watts(220v*15Amps) into this transformer. Another interesting detail is that I think my transformer has 200 turns! I put 16 turns on the secondary (although there is space for more, I just don't have a piece of wire long enough). Which means that my out put voltage will be 17.6v, and 187Amps! Ahhhhhh!!!! If I wind a few more turns on the secondary, I could probably squeeze 25 on there, that will bring my output voltage to 27.5v and 120 amps. Which seems like quite a lot? So here's my question: Will this work? If not, and things go bad, what will happen? Is there any chance that the primary coils will melt, or is it only the secondarys that will do that? I don't really want to destroy my transformer, because they are really hard to get here. South Africans won't give you snow in winter. I had to buy a broken microwave! One idea I had: I have a single coil wrapped around a plate iron core, it looks just like a transformer but with only one set of windings. The thing is as big as the microwave transformer, its wire is of a slightly thicker gauge, and it probably has about 600 turns on it (it belonged to a florescent light setup). I thought I could connect this up to the secondary winding, maybe it will bring the amps down, and also serve as an inductor/ark stabilizer. But I'm just guessing, I'm a complete noob to electronics!?

Asked by lenny25 9 years ago  |  last reply 7 years ago

transformer power

I have been thinking about this for a long time now and in therory it works.  What im wordering is if you could make it work in place of the traditional power outlet.  Here it is, basicly there are just coils of wire inside of a transformer, on coil has say 240 turns of coil. Inside of this coil is another coil with 240 turns also.  So the voltige inside the first coil will be the same as the second coil.  And to half the voltige in the first coil.  If you had a plug that was just a cilender with a coil of wire inside and an outlet that was a hole in the wall with a coil inside.  I know a hole in the wall with 120 volts running through it sounds scary , but put a plastic cylinder inside the hole and vurtaly no shock hazerd. sorry for the spelling errors spell check was not working.

Posted by Laserman595 9 years ago  |  last reply 9 years ago

Now transform this!

This is the most useless piece of wasted technology ever; the "men's groomer" "as seen on tv" !!!!!! I've bought two of these, planning to build from them something more useful, that is a circular etcher / drill and a sort of sliding saw, to etch / smooth / saw materials like hardened paperclay, glass, balsa wood and terracotta; but surely I've presumed to be smarter than I'm in electronics..... So I'm stuck with these two pieces of useless stuff in hand; do you know how to get an etcher and a saw from these? I'm sure there're many smart guys here. This may be one of the smartest instructables ever.

Posted by filt3r 10 years ago  |  last reply 10 years ago

Any particular uses (electronic) for long ferrite beads? (toroids)?

Am aware of toroidal ferrite txformers used in Joule Thief apps,any other uses for the 'longer' ferrites ?

Asked by chadeau 8 years ago  |  last reply 8 years ago

Optimus Prime gets a parking ticket in New York

Traffic Wardens are getting braver... Perhaps we should fear for the poor sap who tries to give megatron a parking ticket!

Posted by Biggsy 8 years ago  |  last reply 8 years ago

Making a small transformer Answered

Would you like to check this project out? it needs a small transformer with 230v input, 12v output 100 to 150 mA. How much turn main and secondary do i need? it said that i have to reverse connected the transformer. Sorry for asking, i'm not an electrical engineering student ​ ​Regards ​Prasetyo

Asked by pmuhammad dwi 4 years ago  |  last reply 4 years ago

Microwave transformers needed!!!

If you have any lying around in your house that you don't need, please contact me at and we can talk about pricing 

Posted by minecraftpotato 2 years ago  |  last reply 2 years ago

All things transformers.

Anything how to wire them, what a centertap does how to wire a auto tranformer, different types below is a five pin transformer from plasmana's worlds smallest shocker

Posted by miiwii3 9 years ago

Bumblebee Transformer Costume

Materials included a couple of foam camping bed rolls... and a bike helmet. Then we used a hotknife from a craft store to cut and sculpt the foam sheets. We used a low temp hot gluegun to put it all together, then coated the parts we wanted to look shiny with polyeurothane.This type of foam accepted spraypaint well, it didn't eat it at all as it would with styrofoam.

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

How to use a transformer?

How to use a transformer?

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

How to wire this transformer? Answered

ok, anyone know how to connect this transformer to mains power .. i get this from my UPS backup ..

Asked by ishan udyoga 4 years ago  |  last reply 4 years ago

Trouble Finding Transformer

I am trying to find two 24 volt 2amp transformers. I have been to a few websites and have found none. Does anyone know of a store where I can buy these transformers?

Posted by Sedgewick17 10 years ago  |  last reply 10 years ago

A Question about transformer? Answered

In transformer formula , the primary turns and secondary turns affect the voltage and current directly. Why some transformer output voltage is affect by frequency and core type , just like Flyback Transformer(LOPT) and Tesla Coil specifically is Solid State Tesla Coil?

Asked by james34602 6 years ago  |  last reply 6 years ago

How to use a transformer? Answered

I need to convert 240V Ac mains supply to 12V DC/ 24 V dc How to do? one way is transforming 220 V ac to 12/24 V ac using transformer and then using diode bridge and capacitor to convert it to dc but i dont know how to use a transformer, how to implement it in a circuit......?

Asked by chatsbk007 5 years ago  |  last reply 5 years ago

Transformers connected in reverse

Hi can a transformer connected in reverse. if 230v to 12v transformer is connected in reverse,. will it generate around 230v Just some silly doubt. Actually i was trying to find a step up transformer.. which converts 6v to 24v. what exactly its called.

Posted by nominds 8 years ago  |  last reply 7 months ago

Something to replace a transformer? Answered

Hi everyone,I just want to know if there's anything that could replace a step-down transformer i.e,Step down 220 volts(AC) to 5 volts(DC).I want a thumb nail sized transformer for my purpose but its hard to get,so if there;s something more compact and can replace the transformer,things would move on awesome!

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

How to make this transformer?

I am going to make a stun gun i need to make a transformer and i don't know how to. can any one explain me a better way? i've uploaded a picture!

Asked by ubdussamad 5 years ago  |  last reply 5 years ago

Flyback transformer wanted

If anyone has any flyback transformers the can sell, i will buy then for $5 or less. I would like to make a plasma speaker.

Posted by anurag130 8 years ago  |  last reply 7 years ago

Microwave transformer ballast

I recently got a working microwave transformer for free, it has unknown wattage, though. What's the best way to ballast it? Some people use lightbulbs, I'd rather not use lightbulbs cause that's almost as dangerous as the lightbulb it's self (I'm comfortable with the transformer, I'm not comfortable with a 500 watt lightbulb, ironic?) No saftey speeches, please, lol.

Posted by guyfrom7up 10 years ago  |  last reply 9 years ago

Knex transformer Poll

I am considering posting another transformer instructable from my collection of transformers i have. It whas been a while since i posted anything and wanted to conduct a poll to decide if and what i should post. So for this poll please on one submission per person and to include only the following: If you want to see a new transformer instructable yes or no and your reason why also which one of the many transformers i have posted you want to see. Depending on the outcome of this i will make my decison

Posted by glitched9700 10 years ago  |  last reply 7 years ago

transformer for neon light

Hi- I have a couple of transformers for some neon lights I got at a place going out of business. I'm never going to start bending/blowing glass so if anyone else has need of the transformers (or the tubes of glass!) I'll be happy to give it away for the postage. Call if you want pictures or have questions. 813-541-2137 Terre

Posted by terrefirma 3 years ago

My Awesome Transformer

I made a transformer after seeing mepain's. Its probably not as good as his, but i still thought i would share it with you. The last Pic is the open guns.

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

220v to 12v transformer Answered

Hi I have two questions. In the drawing below, which diodes do i need to use and will this be compatible with a hand crank generator? Thank you for any help!

Asked by GhengisKhan1981 1 year ago  |  last reply 1 year ago

Flyback transformer question.? Answered

I have an urge to play with high voltage.  Maybe a Jacobs' Ladder, maybe a plasma speaker, maybe just make sparks and burn myself. Does the make / model of flyback transformer matter?  Or do they all connect the same way? For instance, would you recommend this model?

Asked by Kiteman 8 years ago  |  last reply 8 years ago

Pararel connection Transformer

i want to combine two of 10 ampere Trafo, so i can have 20 Ampere power supply  i read a few article that say if we connect the sekunder(secondary) of identical Transformer in pararel, we can have a double time current flow on this connection. do anybody have try this before?

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

Help identifying a transformer?

Hey I just moved my JVC JX-S700 into my new media center, and now it wont power up. Opened it up, and the transformer doesn't seem to be putting off any voltage on the output. I have approximately 1 ohm between the 3 outputs.  So I thought that was likely to be the issue, is there anything I should do to make sure that's the problem spot? Is there another fix for this besides replacing the transformer? And if I have to replace the transformer, can anyone help me identify it? Thanks Crew!

Asked by Cold Shoulder Media 6 years ago  |  last reply 6 years ago

Old flyback transformers

I really want a old flyback transformer for my high voltage projects, but I don't know where to get one. I tried to get one from my local TV repair shop, but they did not have any, only new modern flyback transformers and I don't want that kind of transformer. So if you have any old functional flyback transformers that you don't want anymore, I would really want to buy them from you, and I will pay for the postage price. I will buy modern flyback transformers if you are trying to give it away for a very cheap price or for free (I will still pay for the postage price). Please respond to me if you live in UK, if you don't live in UK, please don't respond to me because I cannot afford such high postage (shipping) bill.

Posted by Plasmana 10 years ago  |  last reply 7 years ago

Fly back transformer? Answered

Ok, i have this transformer that i pulled out of a mac computer a couple years ago, i dont have it with me nut i think its a flyback. If it is, could i just hook it up to a battery and capacitor to make a charger or do i have to build some sort of modulator or switcher? Almost anything helps, thanks.

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