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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 

Topic by jayce_sos    |  last reply


I am trying to turn 3v dc into 300v dc to charge some capacitors I plan to use to make a coil gun. Any way I can do this cheaply and relatively easily would be a huge help!

Topic by J55862    |  last reply


I was wondering if I can covert a transformer that is 220v to 110 and change it to a step up? It would be for a 500w motor. Thanks

Topic by senorkevin    |  last reply

is this transformer

I have this transformer i think. i want to build coilgun and only thing i found is this transformer. does somebody know how  i could connect this with 2x aa batteries and  make  capacitor charger??? ( if you have shematics that would be great) 

Question by tealk    |  last reply

Transformers + )

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

Topic by Mepain    |  last reply

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

Question by sooraj619    |  last reply


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 - ~_~

Topic by crazy lazy man    |  last reply


I'm building a power supply for a cnc router powersupply. The output has to be 36 volts at 12 amps. I'm going to use 6 of the 25.2 volts, 2 amps transformers at radioshack (I have a coupon). When I rectify it it should be about 36 volts. Couple questions about transformers 1) don't transformers essentially short out an AC socket? I don't wwant to start a fire. 2) how can I have a LED indicator that indicates that each transformer is working? I don't want to use a huge resistor, because that seams inefficient. 3) how big of a filter capacitor do I need? I have a 33000uF capacitor, think it's a bit overboard? I know I need at least 4800 uF for just stuff like motors, but the only capacitors I have that works above 50volts is that capacitor. 4) can you connect AC in parralel? Can someone draw be a diagram?

Topic by guyfrom7up    |  last reply


Hello everybody! I just need some help with an electronic project I was doing-I need to desolder a transformer from a camera flash circuit, but every time I try with a new circuit, it always melts or the component leads fall off. I have included some pictures of it, maybe someone could identify the kind so I could buy it at an electronic retailer? It is meant to have 5 leads, with 3 on one side and 2 on the other. On a technical reference it has 7:3 coil ratio. Any help would be greatly appreciated. Thanks!

Topic by NightRider7    |  last reply

Lego transformers

All lego transformers

Topic by ASH9810    |  last reply

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

Topic by glitched9700    |  last reply

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.

Topic by alabasterinstruct  

Knex Transformer

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

Topic by battlefront1    |  last reply

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?

Question by wiccakingkamui    |  last reply

transformer needed

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

Topic by dangerUXO    |  last reply

DC transformer? Answered

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

Question by Jimmy Proton    |  last reply

New Transformers

I though I'd share my new buddies.

Topic by Mepain    |  last reply

transformer input Answered

I have a transformer with 13v input can i give it 240v without it melting and can you please tell me the math of transformers  am new and any information helps

Question by mohamed amin    |  last reply

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!

Question by Adarsh_tronix    |  last reply

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

Question by josh1324    |  last reply

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.

Question by budhaztm    |  last reply

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.

Topic by Kante Tech    |  last reply

flyback transformer? Answered

I took apart a hologram t.v (the ones with projection) and i cannot find a flyback transformer. give me a pic.

Question by knektek    |  last reply

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.

Topic by Mepain    |  last reply

Transformer Apartment

This guy's 330 sq. ft. apartment transforms into about 24 different rooms thanks to a custom designed track system. I wish I had something like this when I lived in New York City.

Topic by randofo    |  last reply



Question by imamfarid    |  last reply

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...?

Question by BobS    |  last reply

Transforming Halloween

Ever since seeing the Transformers movie I just couldn't stop thinking about transformers. So I decided a Transformer costume was it this year. It started out as just a box and later became more elaborate and more of a car. IT IS FINALLY DONE. Took three months but it's done. Pictures of the final product is here. Today I took it to school for a contest. I probably transformed at least twenty times. At one point the tape wasn't working on the spoiler because the "haters" would tear it off. So we used a bolt instead. In the contest people were chanting my name and I won ... a cheapy blue necklace. But now whenever I was going around the block all I would hear is "Are you the Transformer kid? Transform for us". Of course I would. So if anyone has questions or wants me to post instructions let me know. The instructions will be hard because of the variety of height and weight.

Topic by alecgates15    |  last reply

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

Question by pwnag3    |  last reply

Transformer Question? Answered

Hi, I want to plug this transformer I have into the wall to be able to use its output to power several of my other projects. I need a way to limit the current from the mains power supply into the transformer, it has to be limited to about 1/2 an amp. I really don't want to lose any voltage though, and when I use a resistor to limit the current it sucks down all the voltage and overheats. I really need some help with this. Thanks

Question by transistorguy    |  last reply

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.

Topic by PeterE56    |  last reply

Steampunk Transformer

Neat digital piece with a steampunk least this guy has a sensible power supply. i mean, where the hell do you find an energon cube these days anyway? edit: for whatever reason it won't let me embed the video 

Topic by crapflinger    |  last reply

temperature of transformer? Answered

Dear all I would like to use a (temperature Controlled Switch Thermostat Auto Reset ) for protect my transformer (120ac to (60vac 2amp) .Could you point me how much the heat degree( C) of thermistor I must to use please                                      Thank you so much

Question by lam    |  last reply

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

Topic by knightop    |  last reply

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.

Topic by JamieG14    |  last reply

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

Question by 7654321    |  last reply

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!?

Question by lenny25    |  last reply

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.

Topic by Laserman595    |  last reply

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.

Topic by filt3r    |  last reply

Transformer Sandwich

I have a project for college... The assignment is to make an edible or non edible sandwich. I've chosen to make the non edible and I think I'm gonna call it "My Robot`s Hungry" The materials I'm thinking of using are.... *Rubber *Speaker wire *Masking tape *Duck tape *Sand paper *Metal sheets *Wood I have to make it neat because I`m a bit of a perfectionist in general when it comes to these things...Design and wot nots ^^, I have some wood glue and my Dad who is fairly handy.. Anybody that can blast out an idea...any kind...Blast away... it will be a bit of fun and interesting to read... Whoop whoop whoop Tralena

Topic by Cheena Tralena    |  last reply

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

Question by pmuhammad dwi    |  last reply

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 

Topic by minecraftpotato    |  last reply

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

Topic by miiwii3  

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.

Topic by JadeyPro    |  last reply

How to use a transformer?

How to use a transformer?

Question by BickromM    |  last reply

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?

Topic by Sedgewick17    |  last reply

How to wire this transformer? Answered

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

Question by ishan udyoga    |  last reply

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?

Question by james34602    |  last reply

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......?

Question by chatsbk007    |  last reply

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.

Topic by nominds    |  last reply