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 9 years ago

high voltage transformer

I found a flybacktransformer and I would like to sale it. its is nice and heavy built and would have a better duty cycle than one of the newer ones. I would like to get $12 for it. finding a flyback like this one is not always too easy. I added a mug to show the size of it.

Posted by inductionheat! 8 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 2 years ago

flyback transformer driver for beginners: is there a substitution for the flyback transformer?

My son wants to do the flyback transformer driver but we can't seem to find a flyback transformer. Is there a safe replacement or substitute?

Posted by ann.bragonje 3 years ago


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

Posted by senorkevin 5 years ago

New Transformers

I though I'd share my new buddies.

Posted by Mepain 9 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 7 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 7 years ago

Fly back transformer for sale

This is a flyback transformer type that so many people want  I have no clue why they think it is Superior to the regular modern flybacks.  maybe simpler? If some one wants it   $10    also comes with a ceramic high voltage diode.

Posted by inductionheat! 8 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 4 years ago

Transformer vs Potential divider

Hi guys! I got bored and decided to make a study table light using LED's. My setup consists of 4 LED's in an arm and 10 such arms in parallel. I actually designed it in view that the transformer i used converts 230v - 15v. But after it all finished, i found out that all my transformers are used up for other circuits. I was wondering,  Can i use a potential divider for such simple circuits? I approximated that if i place a 46K and a 3K resistor in series and take the voltage across the 3k resistor, i will have about 15 v. What are the disadvantages of using such potential divider? 

Posted by charmquark 5 years ago

Knex Ironhide!

Here is my knex ironhide. he is 99% done. hope you like him! I made him from glitched's pics and vid. He is pretty hard to transform.

Posted by battlefront1 9 years ago

transformer help needed

Hi guys, i'm a newbie on here so i would like to take this opportunity to say hello :) i have a salvaged transformer that i'm working on at the mo. It is the primary that is blown, but the secondary is fine. I am in the uk, so it is designed to run on 240. Because i am looking to produce high amps, one solution would be to use the secondary as a primary, otherwise i am looking at doing a full rewind. i'm kinda new to transformers, but have enough knowledge for the job in hand. my question is how many turns does the primary need to have? i know that you cant give me an exact figure without the dimensions of the transformer in question (700w microwave transformer if that helps) but i seem to remember from school physics that there is an equation to work out the number of turns a primary must have at a given voltage, i have googled for days to no avail, i'm guessing it is out there somewhere, but i cant find it :( and the last question is that if the transformer was to have too few turns on the primary, what would happen when it was plugged in? my guess would be that it would short out the mains and the coil would rupture, possibly tripping the circuit breaker? many thanks to anyone who replies :) and merry xmas to all :) 

Posted by jbaz73 4 years ago

I have continuity in both coils (AC-DC) but no power output?

I have a 12v 2A transformer without power outputI testes/checked with a voltmeter both coils (AC-DC) but no V+ output

Posted by MarcosM117 2 months ago

Knex transformers poll

 I am considering posting my knex transformers 09 Bumblebee revision or Jazz. I am very busy and have only this month to post this poll. To enter just post a cleaver comment and I will judge if I will post my knex transformer by how many I get. If I don't get enough I wont post. The poll begins today and will end on September 20. I will make my decision on the 21st. There is one rule, I will not post both. So, happy posting.  So just as an update, seeing that no one cares for Jazz, I am deporting him from this poll. The poll is just about over and seeing that I have about eight posts, I am very close to making my decision.   If anyone wants to know if glitched is still posting, it is doubtful in my opinion. He told me personally that he is very busy and I believe it too.  Keep up the commenting and happy birthday jandeboer25! 

Posted by battlefront1 7 years ago

Lego transformers

All lego transformers

Posted by ASH9810 3 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 9 years ago

Chroma bandpass transformer substitute

Does anyone know of a transformer (or filter) that can be substituted for the one pictured below?

Posted by randofo 9 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

Transformable Toshiba 815T PB phones

LinkThese phones are a promo for a show called Ketai Sousakan 7 that seems to be about transforming phones. *shrug*Now if they can just get those little missiles and machine guns on them like in the Transformers movie, THEN they would really kick ass. Or if they actually moved. or anything besides usable toys. Still an interesting concept.

Posted by laminterious 10 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 9 years ago

Wanted! A good transformer for a Tesla Coil project

Does anyone have a spare transformer to give me? Your help will be very much appreciated. Any kind is alright. It is for a tesla coil project so a high power one is appreciated.

Posted by GScience 4 years ago

Tiny 12v motor burns out a transformer. Why?

I connected a tiny little motor (12 volts, 60 milliamps) to a 12 volt, 1000 milliamp wall wart transformer.  The motor turned (no load), but when I disconnected it after not more than 10 seconds, I noticed a burnt smell and the transformer no longer has any output.  What happened?  Bad luck, or is there something about a motor's inductive load that would be incompatible with that kind of transformer?

Posted by walter.warren1 3 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

Fly back for SALE $5

I have one flyback transformer for sale for $5

Posted by inductionheat! 9 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

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

25 KVA tesla coil transformer

I have a monster size transformer and I would like to sell it! it is made by general electric, 25 KVA, was oil cooled, (I removed it from its tank)this transformer is the same size used to power subdivisions, 4 to 30 houses ( think of the power!)just image the size of tesla coil this thing could power! WOW! tank size was 17X26X31I would like to get $400 dollars and you take care of the cost for shipping. thats about one quarter the cost of buying a new one even with the shipping cost. (350 pounds!)be reasonable! the person who offers me more money gets it! send me a email, NOT a comment at the bottem. I will wait 1 to 2 weeks to see who offers the most. 5/14/09 I will only take money orders, because they are the safest for you and me.

Posted by Danielro10 9 years ago

Use of transformers/ignition coils in a coil gun.

I've seen a couple of suggestions that an ignition coil, or a decent sizes transformer set up in a similar way, can be discharged into the coil of a coil gun, it the place of the usual capacitor bank. The main advantages seem to be a much faster recharge time, no need to create 200+V, and the availability of parts. I only have 540uF worth of capacitors at 200V, which should work for a small gun, but I have several large transformers, and a crate full of ignition coils. Does anyone know of any reasons why this would not work, or any modifications needed to make this setup work? Thanks in advance for any replies.

Posted by The Skinnerz 7 years ago

Practical considerations when using transformer

Hi everybody! I basically love doing LED experiments and i was replacing many of the night lamps and stuff with simple LED circuits i made. Now i have few questions: 1) I generally use transformers to power them (230v/12v). Now apart from primary and secondary voltages and currents, are there any other ratings which i should consider? 2) I have made a portable night lamp with blue LED's. It has 4 arms in parallel and each arm consists of 3 LED's in series. All the arms are connected finally to a single 100 ohm resistor. Now as at most the whole setup might draw about 50mA of current. I had a transformer rated for about  500mA of secondary current, and so i used it with the setup. Will i have any issues using this? (Although i am sure i won't, but just in case anyway) 3)  Also, the transformer gets hot. How much temperature is in safe operating zone? The setup i used, after an hour, got pretty hot. I could barely hold it for a few seconds and i had to let go. Is it okay if it gets that hot?

Posted by charmquark 5 years ago

Battery powered 120V light bulb

I'm trying to build a steam-punk costume and wanted to use a motorcycle battery to power several edison squirrel cage style bulbs. Fortunately these blubs look better if they are dimmed, but what I'm having a problem with is a schematic and what type of transformer to use.

Posted by Deepeyes 6 years ago

Universal motor projects

Hello, everybody. I took apart a universal motor recently. The motor itself is broken and does not work. However, I would like to know whether I could rewind the copper coils around the silicon steel motor core in order to make a toroidal transformer.  I have heard that motor cores are sometimes grain oriented, which would significantly reduce my transformer performance. This motor is, however, about a decade old. I want to use the existing motor coil as a primary, and then wind thick power transmission line wire as a secondary in order to get a high amperage output. Is this possible? I would also like to know whether there are more interesting projects out there which I could attempt. I have heard of people making generators from motors, for example. However, winding a transformer is my primary goal. I have attached pictures of the motor. Please tell me whether the above mentioned transformer is feasible. Sorry for the picture quality. Thanks in advance.

Posted by TheLightningConductor 1 year ago

diy welding mahine cable size?

Hi guys i wanna make a welder. i checked there the king uses 8 awg copper cables for the winding of the transformers.  here (namibia) they seem to have only 6 or 10 sqare mm cables. can i use 1 of those?

Posted by kefflon 1 year ago

Bad result from the CFL driver for the flyback transformer.

Ts been a while that i have tryed to make a nice arc from my 25 watt cfl driver, the only pin on the cfl that are working are the pin 1 and 4, i i have attempted to connect the pin 1 and 2 toguether and 3 and 4 toguether, i connected both of the mix on the flyback and i could get a huge arc, but i plugged it like 5 sec, and i stopped touching the HV output with the 0v ground  for like 2 sec then my cfl has exploded like a bomb, there was lound noise, and made a hole in my table. so im not gonna try that again. Anyway i can only get 0.5 cm arc from the flyback, and i dont know what to do to make it larger, i know that the 25w cfl can do better. Any suggestion? Sorry for my bad english.

Posted by insistent 8 years ago

Slightly larger LED project.

Ok, so to start off I have done a few very small led projects before. And for some reason I decided I was going to up the concepts and baptismal by fire. Well to say the least I have a few questions. So all that read and help thanks! The Project:I have included a picture in very horrid crayola color to show you kind of what I am trying for. Essentially I am making a 6ft x 4ft robot head. I have built a frame (the picture) and there is going to be a spandex (or screen depending on what I decide) canvas with the bots head on it. What I want to happen is when I press the button (momentary contact) on the controller it activates the appropriate leds that light up a box. I will have at most 5-6 buttons pressed at once. Simple enough. The squares are going to have 18, 3mm leds. The colors are shown in the pic. I know that different colors require different volt, thus different resisters. The eyes are going to have 2 sets of 18 leds for alternating colors. There will also be 2 outside sets of lights to shine upon the face (18 leds also). "The Questions:"Well other than just asking HOW THE WHAT? I'm going to have this (or at least I want it to be) powered by one source. Maybe a 12v AC adapter. The problem is, is this enough? How many amps do I need to power 218 leds? I guess what I am saying is I know the basics but I need help with the electrical rating part of all this.

Posted by Foreverhex 9 years ago

Knex Transformers from the new movie

I used the transformer toy images from to build these transformers, they are true transformations they don't have to be taken apart to transform them.

Posted by glitched9700 11 years ago

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.

Posted by randofo 8 years ago

Unabel to find any Audio Transformers (the little cheap ones) 500 ohm to 8 ohm

The only one's listed on eBay are high end (fairly to extravagantly high priced) transformers. I just need a little 4 legged 500 ohm to 8 ohm audio transformer. All my catalogs seem to offer little help. No need for the C/T like the one pictured....

Posted by Goodhart 9 years ago

Transformer-winding wire

I am going to be hand-wiring up a large lot of transformers. Someone has told me there is an enameled wire (magnet wire) whose coating melts when you dip it in solder (also tinning the copper tip at the same time). What is this type of wire called? I am having a hard time searching for it. Thanks!

Posted by samurai1200 9 years ago

Help with Audio Output Transformer

Im doing this project: im confused about what to connect the audio output transformer to, the one they suggested, and i do, has red and white wires on one side, and green, black, and blue wires on the other, with the black in the middle. Where do i conenct them?

Posted by um0123 9 years ago

What types of oil can be used for high voltage transformer insulation?

I am modifying microwave transformers for a higher voltage to drive a Tesla coil and I need to know what kind of oils for example vegetable or paraffin can be used for high voltage insulation in the transformer to protect it? To what voltage will it insulate?

Posted by The MadScientist 7 years ago

Help Identifying unknown Transformer

Hello I got this transformer from an old ups, there are four wires on the primary side black, blue, green , yellow and two on the secondary red and blue. This transformer used to charge 12v 7.5ah battery also converts it back to 220V in backup mode. Tried testing its output and got this (Mains 220V) Black to ground Blue to mains-> 7.9v on secondary Green->5.5v Yellow->6.5v Connecting Blue and Green to mains and it was a shot circuit and blown my fuse. I want to use this for making a decent power supply 12v+ output, is this possible? I also saw this video;=1 The guy is using his ups transformer for generating hv to power cfl using tip122, i am not sure how to do this using my transformer. I need to make use of this transformer somehow, otherwise its just eating dust at my home.

Posted by Clarkdale44 4 years ago

What's up with this transformer!

Hey I have a litte problem! (sorta, not yet!) So, I have one of those wall adapter things, and it says it outputs 12vDC and 1 amp. Out of curiosity, i hooked up my volt meter to it and the output was a whoppin 20 volts! Why was it 20 instead of 12 like the transformer said? This is making me worry about my other ones!

Posted by HavocRC 5 years ago

Transformational experience for Instructables Artist-in-Residence

Instructables' Artist-in-Residence Mario Caicedo-Langer is pretty hands-on. He can make a robot out of anything, but was intrigued by the 123D suite of apps. I asked him to document his experience here... It's pretty cool - the next step is printing the robot in one print, while still having moveable joints.

Posted by andrewt 5 years ago


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?

Posted by guyfrom7up 10 years ago

Fun withTransformers

Connect the output of 2 transformers in series...  12v  +  6 v. much as you would connect batteries in series. will it burn out?  will it produce 18 v as one would expect with batteries?......... 18 volts!!  yay!   hasnt burnt out( YET)... i wont leave this unattended. transmission of power is more efficient at high v.     sooooo... if i hook the output of a 10,000 v  neon transformer to 2 thin strands of wire( think magnet wire, or a single strand from stranded cable)   and input this  10,000 v into the secondary of a second identical neon transformer, will i get usable 120 v from the primary?  (attempt to run the second transformer in reverse as a stepdown) Nope... not YET.  Suggestions?

Posted by Toga_Dan 3 years ago


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!

Posted by NightRider7 10 years ago

240v to 75kv transformer, shell type? Double winding? Need sum help please!!!!!

Hello! So I found this transformer the other day, it's a 240v to 75kv here where it's gets interesting, it's a shell type, with two separate transformers I'm guessing. It has a input for 240v on each end, it has 1-5 taps but 1 is not used 2 is phase 3 is neutral 4 is earth and 5 is not used. It only has condanuity between 2 and 3 on 240v side. On the high voltage side it has only one output and no condanuity to the core or anywhere, So I'm confused. I'm wanting to make it in to a high voltage Jacobs ladder setup. I have a varic that is 240v and goes from 1v up to 280v on the wiper side it is motor driven. Can I arc between the two hv posts? Also both transformers are have the same phase in parallel. Please help me!!!!! Thanks! 

Posted by nz dude 3 years ago

jacobs ladder help

I'm making a Jacobs ladder. i got the transformer but it doesn't have a plug. what should i do. i was thinking about splicing a extension cord and using it for the plug but i'm not sure if it would work. please respond.

Posted by Sun Gear 10 years ago

Programmable LED Sign

Ok, Today I bought a LED sign for $10, It is the old programmable type, Problem-It takes 9 volts AC, at 30 Watts. Which is a LARGE problem.......I cant seem to find a transformer large enough, to take this, for under $$100 Any suggestions?

Posted by bwpatton1 9 years ago