Identifying transformer windings and voltages

Рет қаралды 24,798

4 жыл бұрын

Identifying transformer windings and voltages
In this video we sort our the windings and votages from an unknown AC power transformer. this transformer has 3 secondary voltages (windings) but there are no instructions or chart to sort them out. So we do it with a multimeter and a variac.
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Пікірлер: 83

@deankq4adj125 4 жыл бұрын

Excellent video, this was great information for us "beginners!" Keep up the good work my friend.

@kevinscollan8293 4 жыл бұрын

Great video as usual and of help to me ATM as I was given a bucket full of transformers and have no destructions so this one was ideal thanks Paul

@michaelpadovani9566 4 жыл бұрын

Cool method for determining the windings within a transformer...I've never run into this but I can see it common occurrence (like a high voltage vintage style as shown here but also any salvaged transformer from old electronics devices)

@opalprestonshirley1700 4 жыл бұрын

Been along time since I did this, thanks for the refresher. Paul.

@noeldakota7395 3 жыл бұрын

I guess I am quite randomly asking but does anyone know a good place to watch new tv shows online ?

@ltsgobrando 2 жыл бұрын

Thanks dude, can't wait to sort out the transformers I've got! I'm making a spot welder to get the fundamentals, then I'm slapping together an AC/DC MIG

@Michaelebills 3 жыл бұрын

You are one of the only videos here using a VARIAC... good for you for teaching it right. I teach by using a VARIAC or 120v to 12v transformer, 12v as the input voltage of the unknown transformer's input.

@robc4191 3 жыл бұрын

Is there a reason not to use a signal generator set to 10v 60Hz sine wave? I've done it that way in the past and multiplied all the resulting voltage readings by 12.

@bernardsemini5706 3 ай бұрын

Gotta have a Variac!

@JasonBlue-rc8xq 3 ай бұрын

Thank you, very helpful to identify one with 5 wires on primary side and 7 on secondary side.

@ferfromla 4 жыл бұрын

Very helpful. I learned a lot. Thank you.

@donnielytton3204 3 жыл бұрын

Very well explained.

@frankowalker4662 4 жыл бұрын

Perfect voltages. It's going to sound sweet.

@TheDigitalAura 4 жыл бұрын

This is why I have an isolation transformer. You can never be too safe. A deeper explanation of what you were doing might have been helpful, for example how certain ohms readings translate into the primary etc, the primary being on the mains side and info beginners may not know.

@vs68s39 4 жыл бұрын

You removed the ground on the isolation transformer?

@greggsvintageworkshop8974 4 жыл бұрын

Great video! New subscriber!

@learnelectronics 4 жыл бұрын

Awesome! Thank you!

@MrPhantomFury 4 жыл бұрын

I hope 1 day u’ll be able 2 review a fluke 187 or a 189 :) How they’ve held up over time :)

@stevensloane 4 жыл бұрын

Should you have checked the center tap for the filament. I would think it goes with the 6.3v not the 5.0v

@learnelectronics 4 жыл бұрын

I did. It goes to the 5

@stevensloane 4 жыл бұрын

learnelectronics that’s odd, a CT for the rectifier filament

@englishrupe01 4 жыл бұрын

Lol! I thought that plane was your variac humming! Lol! I thought "strange, ...mine doesn't hum like that"...lol! Then it was clearly a plane....doh!

@fuzzwack1 4 жыл бұрын

Its a lawnmower! LOL!

@GORF_EMPIRE 4 жыл бұрын

That's a nice beefy looking power transformer.

@willyrivero470 4 жыл бұрын

I prefer to use the series bulb right from the start with a voltmeter. Is faster and safer if taken the right precautions and know how.

@ku4nz 4 жыл бұрын

How to get tech to watch video - "Warning what you are about to see is dangerous" :) good job

@antolingustavo1040 4 жыл бұрын

Hi, what multimeter would you recommend for working on pc boards and reparing power supplys on game consoles?

@EsotericArctos 8 ай бұрын

That one you marekd as 5V Center Tap looks to be more like the colour of the primary... I noticed in the video you didn't actually test that one. Did you test it off camera?

@XPFTP 4 жыл бұрын

dont want the tape to stick.. it does and want it to stick and it doesnt.. gotta love it.. darn was lookin for audio transformer info hahha off to google lol

@bblod4896 4 жыл бұрын

Nice. I guess you could use the yellow low voltage for any semiconductor parts, power on LED, etc. Stay well sir.

@jimhough6233 4 жыл бұрын

Where are they and how much?

@webslinger2011 4 жыл бұрын

Would you get 2.5v out of the 5V center tap wire?

@tylorbutler3490 4 жыл бұрын

yes

@geezberry8889 Жыл бұрын

how do i determine the larger winding in a transformer (the winding with more amps)? My PT has a 20v-0-20v secondary and a 24v secondary (no CT).

@georgechambers3197 4 жыл бұрын

Good info on transformers. Where did you get the aluminum box from? Thanks for the video!

@learnelectronics 4 жыл бұрын

Its from Amazon

@soapboxearth2 6 ай бұрын

Pretty sure that's a 1950s hammond organ transformer. Nearly identical to one in my ao29 chassis. The only difference I see are some.leads are different colors. I just recenrly built a trainwreck express in it.

@LitesLAB 4 жыл бұрын

That was great Paul, thank you! Where did you get the transformer? $25 is an amazing price! Can’t want to see the rest of the schematic! Stay safe!

@learnelectronics 4 жыл бұрын

Ebay

@LitesLAB 4 жыл бұрын

learnelectronics Thank you Paul!

@robc4191 3 жыл бұрын

@@LitesLAB you can also get good transformers inexpensively by getting old stereo equipment from thrift shops. Tape decks, cd players, and dvd players usually have small (below 60 watts) and receivers and amps have much bigger - 250 watts and up. A lot of other good parts in there too. Regulators, amps, ICs, big diodes, heat sinks, etc.

@sanityd1 4 жыл бұрын

You know what you are doing but there could be a cap inside the transformer packaging, on the variac output and everything has L/C/R, just be a bit more careful on youtube bc ppl will ignore any warnings...idk just a suggestion Anyways, thanks for the video, I tried looking for one like it a while ago and couldn't find any that were useful. :) Can you do the same with a signal gen? Is it important to test it at mains voltages?

@jimhough6233 4 жыл бұрын

Great video, Paul. You got a steal on that corner for$25. Where?

@learnelectronics 4 жыл бұрын

ebay

@electronic7979 4 жыл бұрын

👍

@jimhough6233 4 жыл бұрын

K.K. On a digital meter 110mV means 0V.

@mydogworriesalot1840 4 ай бұрын

Yes the online kits are brutal for shipping transformers,if its correct you cant flukes it,I got the most basic model did you get the proximitly voltage sensor?good choice multimeter what wil. You use to test your channel outputs?

@keithking1985 4 жыл бұрын

PAUL I NEED TO POINT SOMETHING OUT, been just new to this myself i can probably spot the thing that would confuse you easier when 1st learning this stuff... at the beginning when you had it on the wrong setting it showed 110 "mV" now someone new to this "WOULD" mistake that as a transformer that was plugged in to the wall.. especially in the States and place's where the wall voltage is 110 VOLTS.. then you touched the bare/insulated wires.. Do ya see where im going with this. Paul i hope you don't think im being bad here.. i don't mean anything bad by it..

@learnelectronics 4 жыл бұрын

No, all good my friend. Thank you!

@user-pc1kz7tg9y 5 ай бұрын

how is the variac connected to the transformer? Nevermind, I saw how later in the video.

@davidluther3408 4 жыл бұрын

WHAT DID YOU USE FOR THE FOR THE WHITE TAPE AND WHERE DID BUY IT?

@learnelectronics 4 жыл бұрын

Its medical cloth tape from my local Walgreens

@bluestreek4784 4 жыл бұрын

I would have thought that what you marked as 5v center tap would have been for the 240v line

@learnelectronics 4 жыл бұрын

There is no 240V winding. 330-0-330 6.3-6.3 5-0-5

@bluestreek4784 4 жыл бұрын

@@learnelectronics ok cool, great series so far, love the information from all your videos, keep up the great work and thanks for all the videos I've learned a lot

@lcarliner 4 жыл бұрын

Don’t you need to confirm which black is the center tap? One end of the black with the true center tap would be one-half the outer pair. True? Am I missing something?

@pulesjet 4 жыл бұрын

Not having a Variac, We used a 15w light bulb in series to test this stuff. LOL In the Military you got so used to doing so much with so little you figured out ways to do just about ANYTHING with literally NOTHING.

@opera5714 4 жыл бұрын

Always use a lamp in series! It is nuts not to use one. Once a winding gets much over the rated voltage the transfçormer saturates and it just turns into a resistor. Without a lamp dual primaries instantly become a short. And just who has a variac, your viewers are just unknowing beginners. Shameful video.

@SteveJones172pilot 3 жыл бұрын

@@opera5714 Can you explain this better? Are you saying because the current is near zero on the unterminated secondaries, the voltage approaches infinite? (Kind of like a current sense transformer without a load resistor?) if so - Is the danger just in touching an unterminated secondary?

@opera5714 3 жыл бұрын

@@SteveJones172pilot With a lot of wires it is easy to get confused. TWO cases: Dual primaries can be wired in series or in parallel. These must be phased properly or the primary can draw a lot of current The magnetic field from one winding cancels the other out. Applying a voltage greater than the rated secondary, like 120V AC to a 12V ac winding, causes the transformer core to saturate. As the AC waveform increases in voltage the magnetic core can no longer store more energy. The inductor saturates and turns into just a resistor. A lamp in series would limit current to a level that would be safe, at least for a reasonable time by illuminating. As the lamp heats up, the lamp resistance also increases dropping current even more that just a resistor. About a 7 times increase.

@RespawnRestricted 4 жыл бұрын

Could injure kill you or better yet teach you valuable lesson

@kissingbanditt 4 жыл бұрын

What is a filament winding compared to a normal winding?

@learnelectronics 4 жыл бұрын

No physical difference. Wound exactly the same, just a different purpose

@kissingbanditt 4 жыл бұрын

learnelectronics thank you and thumbs up.

@baguabeetle Жыл бұрын

What is the function of the filament winding?

@learnelectronics Жыл бұрын

It heats the tube filaments causing them to emit electrons. Another name for vacuum tubes is thermionic tubes.

@Noah-gq7pq 3 ай бұрын

great vid lovin it,,i got knocked on my ass 1 time thank god low current at 400 hertz,,hung over form ya know par tay

@davidluther3408 4 жыл бұрын

HOW DID YOU DETERMINE WHICH WINDINDS ARE THE PRIMARY?

@learnelectronics 4 жыл бұрын

Honestly by trial and error. I had a little starting knowledge. I knew it had 300V+ secondary and I knew that the primary wasn't tapped. Also the leads for filiment windings are usually heavier to carry more current. So the yellow and reds were out. That left thick and thin black. I tried both while measuring the voltage on the reds. I was wrong the first time.

@davidluther3408 4 жыл бұрын

IT SOUNDS LIKE THE SHOTGUN APPROACH.THANKS!

@melplishka5978 3 жыл бұрын

Is that a fender transformer?.

@learnelectronics 3 жыл бұрын

Hammond

@melplishka5978 3 жыл бұрын

@@learnelectronics nice. Was it a find or just a prop lol

@weerobot 4 жыл бұрын

I'll Stick to Safer Projects...lol

@randydicotti3975 2 жыл бұрын

I measured the windings on my transformer....nothing......ZERO ohms on ALL wires. The transformer works perfectly. So this resistance test does not work for all transformers