How to Identify the Primary and Secondary of a Flyback Transformer

[@grego1451]

Nice hack with the batteries at 2:25 to find the ground pin. Worth the whole video. See how little current the diodes in the secondary need to conduct. A meter with an input impedance of 10 megohms measuring 10 VDC has only 1 microamp following into it.

[@fpicoral]

Really great video but the only thing that is missing is that you don't need to check for pars of pins, you can have a high resistance between pins that are not close together. You also should isolate the pins with hot glue or oil before using it. Some flybacks are a little different and require connections between some pins. If your flyback is not working, solder a wire to all pins that are not being used, put them close together and watch which ones that arcs. Those that arc should be connected together.

[@michaelreilly8490]

thank you while hard to understand you are very intelligent and so very helpful you get directly to the point and you know what you're talking about so once again thank you

[@cranegantry868]

This is very good and is a quick, organized way to discover the correct pins.

[@markherring3513]

ok...which pin is the B+ pin??....and once all pins are identified how do you test the flyback to see if its good or not????

[@markhonea2461]

I am so happy to find your channel! I'm at work and only glanced at your other videos and I am totally looking forward to viewing them because I saw some topics that I have an interest in!!. After work of course.👍

[@PowerMat81]

The simplest method that i ever seen!! Thank you so much Friend

[@robowolf883]

ive got a problem ive found my flyback in a miniture CRT and when i test for the ground pin all of them accept for 3 show 3 volts (using 9 volt battery)

[@AtomicElectronCo]

Thank you very much for sharing information! KZbin scientists and engineers will save the world! Cheers!

[@balbal1497]

excuse me sir, i want ask, what the output or the secondary voltage of the flyback transformer? it's a DC or AC voltage. And the voltage selector that using in the multimeter is the AC or DC selector?? thank you very much to the great explanation

[@hadzrinekosni4530]

Can we use the other pins to be a feedback/aux coils

[@dandruff7807]

Would using an inductance meter instead of a multi-meter be better at finding the primary/secondary of a flyback transformer?

[@halbvoll1]

Not necessarily in this case because these types of flyback Transformers have diodes between the secondary and the red hv cable and in this case the inductance meter won't work properly

[@Biruk_Technicians-1990]

what if connect the +ve of meter/voltimeter to the flyback pin and +ve of the battery to the +ve side of secondary flyback

[@Kreanor26]

the transformer i have has a grey wire coming out the bottom near a turnable knob, idk what its for. it has a red wire that looks attached to what i think is a capacitor then a white wire coming out from near one of the knobs(the middle knob) on the flyback.

[@Iamsuccesspro]

How is 18vdc inducing voltage in the coil? It takes ac current to work on a transformer.

[@ludicscience]

Not only ac, it also works with pulsed dc.

[@Iamsuccesspro]

@@ludicscience yes but you were not pulsing it

[@CoderBittu]

3:53 The pin identification of secondary could also have been done without a battery. By using continuity mode in multimeter

[@CoderBittu]

@@TD75 oh, Thanks for the clarification friend.

[@ruby_R53]

there are flybacks with one or more cables besides the red one, which is the high voltage output; in my case I have a yellow cable next to the red cable. what are these wires usually used for? is it a ground or something?

[@kaziaburousan166]

My flyback has a white wire and 2 red wires(one with the suction cup and one other red). What does those do?

[@PabloMHZ]

Can you use only one battery(9v and not 18v) to find the ground of the secondary ???

[@tf3confirmedbuthv54]

This video is amazing! It really helped me out! I hope to see more content like this!

[@melplishka5978]

Sat Sri akaal , hope I spelled that right lol. Ty. Finally a proper diagnosis of a flyback 👍👍👍👍👍

[@halbvoll1]

Great work, because of the diodes that are integrated in the secondary site that's the only easy way to measure out the secondary coil

[@MechanicForGMCCars]

Well can that flyback transformer be used some thing similar to variabel inductor? I cinde of have small inductive trigger on me distributor so I was curiuse culd that thing posibly some how phase shift that pick up coil or the gm ignition module. Im in dilema for days finding some thing that does that task just to retard me ignition timing on engine start up . So I need some thing that can regulate pulses or restrict the triggering circuet . Only problem I dont know if I shuld use voltage restricting circuet or frequency restricting circuet??

[@MonkoGames]

by the way, if you get different voltages than he does, you can rotate the two adjusters on the side

[@henki1986]

sir, i have flyback transformer FA122WJ-SA, this FBT has no datasheet when i search on google, and when i try your method, i got 1,7 ohm, 1,1 ohm ( more than one of 1,1 ohm connection) and unlimited resistance pin. how i can find primary and secondary ?

[@ludicscience]

try al of those pairs of pins, there is no way to tell which of them is the correct one.

[@henki1986]

it look like i must try your another video "easy flyback driver" i think that video is very simple.

[@Dekijevemasinerije99]

I have a transformer of 5 pins. I found him in the plasma ball. There are two pins of 8 ohms. which is the primary coil? Does this transformer can be used for the Tesla coil?

[@SunsetCurve8784]

King of command blocks

[@SanderOlbermann]

great vid. i would like to know how to bypass the protection circuit against horiz deflection yoke open circuit. in order to drive horizontal yoke with a different signal and wave form.

[@DolezalPetr]

Hello, I have the same transformer, can anyone tell me the voltage of the secondary side? Transformer is bsh8-n5 I will be powering a small crt with it and I do not want to destroy it with too high voltage and is there a difference when I use different flyback drivers? Will using different flyback drivers effect the voltage on the seccondary? Thank you :)

[@danielmaclean4718]

Beautiful, thanks so much for this. Great explanation.

[@dandruff7807]

Which is better, an ohm or an inductance meter to find the correct taps on a flyback transformer?

[@docdaven]

neither. for the flybacks with built in diodes, they won't switch on until the forward bias is high enough -

[@CyberhugTechnologies]

Good video and good tips, thank you.

[@azariayehezkel9064]

0 is open resistance or o ohm?

[@PHM_Tech]

0 is short basicaly

[@cassvirgillo3395]

Hi LS, Tried it with no success. I tried AC and DC voltage with negative results. I would like to know what scale you used, AC or DC to measure. Would like to make Jacobs ladder for a science experiment. Thankyou for any help. Take care, C.

[@ludicscience]

I used DC scale. Not all flybacks can be tested with this method, perhaps you have one of those.kzbin.info/www/bejne/a6OUqXVnm9KKh6s

[@hadzrinekosni4530]

Because i cant find any 9v battery around me, i just use 240v.ac but in maximum alert. Ive follow every step same like you. But no voltage found in any pin.. but when i swap the probe.. suddenly 240v is pop-out in 1 of the pin...why ?

[@DasAntiNaziBroetchen]

First of all, you're likely destroying your flyback by putting such a high voltage into it. Secondly, are you measuring in DC mode? A flyback has an internal rectifier diode that makes it output DC only.

[@hadzrinekosni4530]

@@DasAntiNaziBroetchen yes in theory.. But i not even think about that.. because my exprnce is more to ac. Sometime we got to do what musnt (in a super-full caution...ofcourse)

[@harshrateria9021]

Hey ludic science i was wondering if i use this high voltage for electrostatic precipitator will it work.?

[@madasimeghana8726]

Can you pls tell where can I buy that flyback transformer

[@ulpijana73]

I'm confused by measuring resistance on my flyback transformer trying to find the primary coil! From pin 1 to pins 2, 3 and 4 I have the same value of 1,3 ohm! Between 2 and 3, 3 and 4 is 0,4 ohm! Between 5 and 6 is 0,4 ohm! Between 6 and 7 is 0,6 ohm! So where's the primary coil pins???

[@matthewkevinkumar2969]

Same problem here !

[@allwynchandrakumar8031]

3&4pins which has nearingly 1ohm - 2ohm is meant as primary coil

[@allwynchandrakumar8031]

1&2 pins are meant for feedback coil

[@ayanvaidya2727]

Can I use this capacitor to make taser

[@diwakarmanandhar97]

I used 24 volt input But I got only 2 volt at the ground pin of Secondary coil. Was my fly back transformer bad in condition? Then, how to check a good condition fly back transformer?

[@lazar2175]

Diwakar Manandhar You need flyback driver.

[@andreiruiz9985]

sir i hve a question that you can answer.ihave a ac welder and hf stabilizer what can i put for filter cap wht is the value??? please hlp me!!

[@ludicscience]

+andrei ruiz i do not have experience with welder machines

[@sarthakvarma4382]

What is the voltage of the TV transformer?

[@ancelb9590]

I scrapped a bad xformer for the ferrite core. Turns out to be type 31 MnZn ferrite.

[@Wolf-yp2qk]

I don't know how to use my ohm section of my multimeter, it says 200 then goes up to 2000 all the way up to 2000k. Any help?

[@ludicscience]

+Scotlahn Mccallister Use the 200 ohm setting.

[@andyroo3022]

Excellent explanation. Thankyou for your knowledge. I need this to build my spark gap tesla coil

[@kabandajamir9844]

So nice thanks sir

[@nirajpaudel954]

To test ground pin can't we simply test the continuety of red wire and other pins?

[@ayanvaidya2727]

SPIAR The resistance of secondary is very high Then continuity will show nothing

[@Iamsuccesspro]

There's a high voltage diode built in, it needs about 30v to start conducting

[@Elfnetdesigns]

You cant rely on this method to work for every flyback out there as most larger ones will not show a secondary winding resistance nor an output voltage from an attached battery. it's best you find a spec sheet and pinout for your desired transformer.

[@ludicscience]

ElfNet Gaming Yes I have seen that some flybacks do not work with this method. But sometimes the flyback has no marks or the datasheet is not available. I will add that to the vid description thanks.

[@matthewkevinkumar2969]

Yeah man totally true doesn't work for mine.....

[@mikebayliss5540]

If these tests don't work for you then the tx is probably unsuitable for your application.

[@easydiyelectronics1058]

Hi, Thank you for this video, its help me a lot. And I am your new subscriber.😍

[@zezeA380]

I took apart a TV and got a flyback transformer. The Flyback Transformer only has a pair of pins that is less than 1 ohms.

[@gyorgykomaromi994]

Hi, dear sir, I have a question :) I cant find the primary and secondaty of my flyback...but on the back of the circuitboard every pin had a number or name near it, so: Pin1=COL, 2=B+,3=14v,4=-14V,5=-190V,6=GND,7=N.C.,8=N.C.,9=ABL,10=H.T/HEATER... which is what???? Pls help me sir, it would help me to make progress in my tesla coil project...I've got 1ohm when i connected the 10th and 8th pin...aaand what will happen to my tesla coil if i add one more powersupply like this or similar???(in parallel of course...)

[@ludicscience]

+gyorgy komaromi Sorry I don´t know that nomenclature. You cant use two power supplies in a tesla coil, is better to use a single powerful one

[@bertbronson8395]

FANTASTIC explanation! Great Job!

[@dalewhitmore143]

How can I step up the voltage out of the flyback?

[@ludicscience]

Marx generator

[@dalewhitmore143]

Ludic Science Can you make a video on this. This is the one I bought for $23. kzbin.info/www/bejne/iKGYiqxjpNehoK8. I want to make more power ; )

[@wolfkotenberg1840]

nk you for the clarity . I understand the concept of this. I have a 1950's flybackmade by RCA and a new ZVS driver. Should be fun

[@九-f7c]

hey dude when i try to find the volts its reads 0.3V should i use it?

[@九-f7c]

its only on 1 pin though so is that the ground?

[@tibianomaster1]

Hello Ludic Science! Any flyback works as high voltage power supply ?

[@ludicscience]

+João Victor Moretti Yes

[@jeanpierredaviau7478]

Would it work at 60Hz , 12 volts and let say 10 turns?

[@Iamsuccesspro]

Yes it would work( 60hz), but it wouldn't be high frequency (high frequency > 700hz produces skin effect, won't shock you, rather melt your skin)

[@TheSpinninHead]

Nice video. How to make a 20,000V spark generator driven by AC signal (20,000-180,000Hz)?

[@miodragbabic2860]

This type of transformer usually have diodes at the output. So no matter how high you bump up the frequency it will still have the huge DC component at the output that will shock the sh*t out of you.

[@DasAntiNaziBroetchen]

"The primary of our flyback will be that pair that has a value of resistance close to 1Ω." Can you explain the reasoning behind that to me? Why not 0Ω?

[@azariayehezkel9064]

B+ is not primary winding?

[@asrilusman588]

Berapa nmor seri plaibek yg di gunaka untuk metal detektor

[@pabloalfaroc56]

Whats the feedback coil?

[@mikebayliss5540]

You get a signal on the feedback coil when the big hv coil turns off.

[@gyorgykomaromi994]

On my flyback I can get 1ohm only if I connect the 10-th(last) and 8-th pin

[@zinebattou9958]

Excellent video as usual, I have a final project to study, part of my project requires a bibliographic search of all types of HT generators well on also realization. What I want is reliable documents about HT generators. thank you in advance

[@lilflatty2472]

You didn't explain the secondary? What's is used for?

[@dabber6832]

i use them to light up neon projects i build, they bite hard..lol

[@acceptthetruthitwillsetyou2598]

I am only getting 1 ohm across the entire transformer, does this mean this transformer is no good?

[@ludicscience]

+ben barr What do you mean by "entire transformer"?

[@acceptthetruthitwillsetyou2598]

None of the pins read higher that 1 ohm for the pairs that are connected.

[@ludicscience]

+ben barr Not all flybacks can be tested with this method, i am not sure why. Perhaps you have one of those.

[@acceptthetruthitwillsetyou2598]

Ludic Science Must be bad luck, I have had three transformers with 2 different meters do the same thing. Is there another method to find the primary and secondary on the flybacks that don't work with this guide?

[@ludicscience]

+ben barr This is the only method I know. You can try to find the datasheet if you know the model of the flyback.

[@docdaven]

Good to know. I had to put 30V DC on mine before I could see something - turned out, I had one that was different than most and PIN2 (or PIN8 depending on how you count) was the ground for the HV side. - it passed through 3 diodes - strange, the diodes need so much voltage to switch on.

[@kanchanmisra2979]

Really, like how much votage the diodes need?

[@dedadrakce]

Hi, I appreciate your tutorials, because they are so clear.I am trying to make a Tesla coil, and I need high voltage supply. I have one larger flyback transformer just like you show on the end of your tutorial.This one have 11 pins.Now I have a problem to locate primary of flyback. I measure 0.9 0hms between 7th and 10th pins and 0.8 ohms between 8th and 10th pins. What you suggest now. Thanks.

[@ludicscience]

+Milan Brkic try both pairs, the flyback will not be damaged if you use the wrong pair.

[@dedadrakce]

+Ludic Science Thanks. I try both pairs with two different circuit from cfl lamp, and doesn t work. How can I know does this circuits from CFL lamps are correct. How many volts should be on the output of this CFL circuit. I have one smaller flyback and one of primary pins are clearly visible, can I tray every other pin with it. I already find a ground on both flybacks. I will try option with winding a primary and feedback, and what is better solution in your sight , CFL circuit, or "winding" option.If i try a "winding" option I suppose that can use the transistors which have been in TV with that flyback.Thats D1651 9M1 and 2N 6253 or have to use TIP 35c like you said. By the way I can by TIP 35 without C, but that is expensive to me.I also have Bu 208, S 2530 A (4 A) and 2N 3055. Thanks.

[@ludicscience]

+Milan Brkic CFL circuit should give somo 600 volts. You can add a 10 k resistor to the CFL output and check if there is a voltage. I prefer the winding option, but you can not use the TV transistor. That transistor is designed to work with the internal coils that need 100+ volts. The 2N3055 can work in place of the tip35c (if it is a real one, the 3055 is the most counterfeited electronic component)

[@dedadrakce]

+Ludic Science Thanks again.I have two 2N3055 and both are real.Both are produced in my country (in my town exactly, when this was a one happy country) 35 or 40 years ago.And both are still operated.I will be free to ask you again if I stuck somewhere.

[@ludicscience]

+Milan Brkic Great!!!! Hope it works.

[@sohamgumaste]

Will this technique work for other types of tranformers?

[@ludicscience]

Soham Gumaste Work for flyback transformers

[@sohamgumaste]

Ludic Science So it won't work for other multi pinned transformers? I found a random one the other day and I want to figure out the pin layout...

[@ludicscience]

Soham Gumaste I dont think it works for normal transformers since they have a wide range of resistance values in their coils.

[@sohamgumaste]

Ludic Science Thanks for replying!

[@renekenshin6573]

Great, I was looking for this tutorial, as always nice video. Fyi subscribed, keep up the good work :D

[@ludicscience]

rene kenshin Thanks!

[@delron44]

excellent vid, thanks for posting

[@snaprollinpitts]

thank you very much, very well done!!!

[@ludicscience]

:)

[@richharrisonline]

can u tell u what model# of flyback that is, incase somebody has the same #... might save them the trouble of testing it. thanks for the vid!. subbed!. awesome chan man!

[@ludicscience]

Richard Harris Sorry, I have more than 50 flybacks, I don't remember which one I used foot this video. Thanks and welcome to my channel!

[@SpeakEnglishToday_]

Hi friend. Its exactly the same video on an spanish channel. Manuel Rodriguez-Achach. Are you partners ?

[@ludicscience]

Yes.

[@Anurag2701]

actually i have a big one (that u showed in the last) flyback but in that every pair had 1.6Ohm resistance but one pair had very high resistance out of range of my multimetrer and when i did the battery test .. one of the pin of the high resistance pair was the primary which showed nearly 15-17V

[@Anurag2701]

what are those adjustment dials on bigger flybacks? and what are the other two wires for?

[@ludicscience]

Anurag Trivedi those are used for screen adjustments in tv use. You can simply cut those extra wires

[@ant78se]

Ty for the video! very informative =) The easiest way to identify the connections is when you pull it out of the tv isn't it??

[@ayoubsar27]

Great man am satusfied for the first time. Realy think u.

[@davidbolha]

Hello, Thanks for this. 🤗

[@ash0787]

urgh its so confusing, mine has 10 pins on the bottom and 2 red wires, 1 grey, all with hv insulation on.

[@mosmansengul]

still can not find the end :( pfff

[@kotikoti7190]

Super very useful message

[@kali223laron]

thanks just got my 1st fly back

[@DAFERD5BDR]

thanx just now this matter soo clear nice explaning and nice man godbless you

[@salimzander8335]

This is exhausting I'll just check the data sheet

[@w5cdt]

That's exactly how I found the HV secondary ground wire....except I used a power supply.

[@randytravis5893]

could you make a stun gun with this fly back transformer, or a very powerful joule Thief?

[@God-yb2cg]

Yeah you can make a stun gun with a flyblack, well actually I'm not sure about stun gun would be the right thing to call it, since you can probably kill someone with it.

[@sukumarjakki2094]

This is nice but my question it's used fishing hunting with water, Yes or No explanation please

[@DasAntiNaziBroetchen]

Fuck off with that shit. Such fishing techniques are not even legal.

[@Khwartz]

So Clear! Thanks! :)

[@kimji01]

thank you so much

[@PyroTronix]

kimji01 qqazl

[@bobbylong4443]

❤❤❤ 😊 awesome

[@azariayehezkel9064]

Somebody know?

[@electrogravlabs]

Very helpful

[@jaymemendonca6075]

Very Good!! Tank!! Obrigado!!

[@CICADA-ky6tj]

I managed to identify mine, by lining them up in a police identity parade. . .. it was a negative identification

[@CICADA-ky6tj]

guilty as CHARGED. .. in the case of the capacitor

[@mikebayliss5540]

@john jay Yes quite right. That's what happened to me.

[@dionisioantonioramallo5145]

En español...también sería excelente

[@videoinducation7289]

Tnx so' much , i like and subscribe :))))

[@medicboi1263]

simple and clear

[@johnmcgaghey1127]

thank you

[@ayoubsar27]

I will subscribe to!

[@techjawad2700]

طريقة اختبار اللاين

[@SalimSalim-cr4vt]

شكرا جزيلا