Identifying transformer windings and voltages
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- Опубліковано 19 кві 2020
- 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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Excellent video, this was great information for us "beginners!" Keep up the good work my friend.
Very helpful. I learned a lot. Thank you.
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
Very well explained.
Been along time since I did this, thanks for the refresher. Paul.
I guess I am quite randomly asking but does anyone know a good place to watch new tv shows online ?
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)
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
Thank you, very helpful to identify one with 5 wires on primary side and 7 on secondary side.
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?
Perfect voltages. It's going to sound sweet.
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.
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.
Gotta have a Variac!
Great video! New subscriber!
Awesome! Thank you!
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.
You removed the ground on the isolation transformer?
Hi, what multimeter would you recommend for working on pc boards and reparing power supplys on game consoles?
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!
Its a lawnmower! LOL!
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?
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).
Should you have checked the center tap for the filament. I would think it goes with the 6.3v not the 5.0v
I did. It goes to the 5
learnelectronics that’s odd, a CT for the rectifier filament
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
How to get tech to watch video - "Warning what you are about to see is dangerous" :) good job
I hope 1 day u’ll be able 2 review a fluke 187 or a 189 :) How they’ve held up over time :)
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.
Good info on transformers. Where did you get the aluminum box from? Thanks for the video!
Its from Amazon
Would you get 2.5v out of the 5V center tap wire?
yes
That's a nice beefy looking power transformer.
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?
👍
how is the variac connected to the transformer? Nevermind, I saw how later in the video.
WHAT DID YOU USE FOR THE FOR THE WHITE TAPE AND WHERE DID BUY IT?
Its medical cloth tape from my local Walgreens
Nice. I guess you could use the yellow low voltage for any semiconductor parts, power on LED, etc.
Stay well sir.
Where are they and how much?
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.
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!
Ebay
learnelectronics Thank you Paul!
@@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.
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?
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..
No, all good my friend. Thank you!
What is a filament winding compared to a normal winding?
No physical difference. Wound exactly the same, just a different purpose
learnelectronics thank you and thumbs up.
What is the function of the filament winding?
It heats the tube filaments causing them to emit electrons. Another name for vacuum tubes is thermionic tubes.
K.K. On a digital meter 110mV means 0V.
Could injure kill you or better yet teach you valuable lesson
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.
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.
@@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?
@@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.
Great video, Paul. You got a steal on that corner for$25. Where?
ebay
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
HOW DID YOU DETERMINE WHICH WINDINDS ARE THE PRIMARY?
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.
IT SOUNDS LIKE THE SHOTGUN APPROACH.THANKS!
I would have thought that what you marked as 5v center tap would have been for the 240v line
There is no 240V winding. 330-0-330 6.3-6.3 5-0-5
@@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
I'll Stick to Safer Projects...lol
Is that a fender transformer?.
Hammond
@@learnelectronics nice. Was it a find or just a prop lol
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
What about an auto transformer?
99% Perspiration don’t think cars have transformers 🤔
@@jasonlee3247 1. They do - ignition coils. 2. i think he means an actual autotransformer (variac) :)
@@MkmeOrg they make fixed winding autotransformers.
They are NOT isolation transformers.
@@bjl1000 do you mean the auto transformers that turn from cars and trucks into robots?
Okay someone or somebody is bored and just had to cut and mow the grass
neighbor