Thank you so very much for making and keeping this video online. It was thorough and the information is sound. You've helped divert a possible crisis here at home. I ordered a bunch of transformer because they were roughly 24 dollars each but the one I replaced were 80 dollars so I saved quite a bit with the ones I ordered from China. Both sides of of transformer had the same size wires ,which as you presented a big problem. But I paid attention to your video and finally figured out which side was which. So thank you very much.
Since a plain isolation transformer that can have 120 V going in and 120 V coming out, is there really a primary and secondary? Or when you connect one up can you use either set of wires for the primary and the other for the secondary?
I have a transformer from a UPS. It has two fat wires on one side, and three thinner wires on the other. I assumed (stupid I know) that the fat wires would be the primary, and plugged it into the mains as I wanted to check the secondary voltage (was assuming it would be 12-0-12, or even 6-0-6). It tripped the breaker. I then measured the resistance of all coils. The fat side has a resistance of 0.4 ohms (does that mean its gone??). If the thin side wires are A, B, and C; resistance between A&B = 26 ohms, A&C = 24 ohms, and B&C = 2.7 ohms - somewhere I was expecting much more resistance!! I'm measuring with the meter on 200 ohms setting, so pretty sure I'm not getting confused with K ohms. So I will wait until I learn more before I try to plug in the other side....any help is appreciated!!
Gday LS I would have thought the secondary winding would have the thicker cable because in stepdown trany the secondary current is higher than the primary winding. I guess since the primary has the higher voltage the insulation needs to be thinker.
I have a transformer that only has a black and white wire for mains. I took it from a lamp and it was conected to a seperate ac socket along with a breaker switch. It says on the shell its .03 amps. Is this a ac repeater transformer? Or some kind of step down transformer? it has no secondary
at the beginning of you explaining the turns and resistance of the primary and secondary, I believe you explained this backwards as to the way it actually is. when you performed the resistance check, you stated the orientation correctly though. may want to have a listen and watch the video to double check.
If the mains voltage is 120V then the resistance of the primary is halved I assume. E.g 500ohms instead of 1000ohms. And the spark dimished too. I hope I’m not mistaken here.
Hello Thank you for your informative videos. Do you have a video about choosing the right winding wire size for primarily and secondary sides of AC transformers. Waiting for your helpful reply. Best regards. 😊 👍 .
@@ludicscience thanks for the nice response to an idiotic comment.... question: is there a way to tell whether a transformer is suitable for audio (wire count, colors, shape?) without being able to test? i occasionally will come across a bunch of transformers for sale, however they are unmarked (which is why i found your video, thank you for sharing your knowledge!) and it isnt possible to do much in the way of testing... the most i can do is bring a multimeter with me...
A transformer only works on alternating voltage (AC), so I would never do this measurement with batteries that provide a DC voltage. DC voltage can damage transformers! You must apply a low alternating (AC) voltage with a variac, on this way you can easily and reliably find the primary side of the the transformer and also the transformer ratio because that is also important.
Identifying primary and secondary you showed is not true. Like others commented, step-up or step-down. Second, the size of the wire, color and how many grouped together means nothing. I have a transformer with two primaries that are 22 awg... 120 volts for each one. In parallel connection of two primary input voltage 120, in series connection of two primary inputs 240. One secondary with two 10 awg wires with an output of 13.5 v at 40 amps. All wires primary and secondary are black. So, please do not follow this rule of size, color and grouping! The best way is to just use the secondary of a known transformer (i.e. 12v AC) or a VARAC, connect to each two wires and read the voltages and go to the next two... with this method. You will be able to identify primary and secondary, plus all the taps without damaging the unknown transformer. As well as yourself.
Transformers are only connected to AC, and AC does not have polarity. There is no positive and negative. If you connected DC voltage to a transformer, you would just create an electromagnet. You have to have AC's changing voltage to get anything out of a transformer. AC causes an electromagnetic field to build-up and collapse constantly and very quickly. This is what produces your output on the secondary.
“Connect ..tooo….toooo wires “ 🤣 cmon give Him a break his first language obviously isnt english so pretty sure he is smarter then half the world already that only speaks uno
Doesn't the word transformer mean to transform, to go up, like up high. So what is the deal with transformer as rule implying coming down from a higher voltage to a lower voltage. And once in a while of course to higher voltage. It is surely a very confusing deal that the world of science got it screwed. No one wants to say step up or step down transformer as that is too many words. Besides step down transformer is pretty absurd by the very usage of words. How can you transform by going down? And science was suppose to most exact clear thing we are suppose to have. Of course there is more absurdity besides this.
I know it isn't "politically/socially correct to make race an issue but god-damn can someone who speaks English (as their primary language) to do a video !? I mean this is potentially dangerous stuff and i would like make sure i understand fully what is being said. 😮
The primary can be the secondary and the secondary can be the primary. It really doesn't matter , it depend what you want to do with it so your video is useless.
Thank you so very much for making and keeping this video online. It was thorough and the information is sound. You've helped divert a possible crisis here at home. I ordered a bunch of transformer because they were roughly 24 dollars each but the one I replaced were 80 dollars so I saved quite a bit with the ones I ordered from China. Both sides of of transformer had the same size wires ,which as you presented a big problem. But I paid attention to your video and finally figured out which side was which. So thank you very much.
Glad to hear that!
Loud& clear of descriptions . Thanks !!
A brilliant & very informative video, very helpful, thank you very much.
Informative video 👍
Thank you very much
Thanks this help a lot .
Close to 100k subscribers, Ludic- well done!
I need a pcb
Pls can I get help
thank you amigo, great video!
Great 👍🏼 video!!! May I ask why are some transformers have 3 windings instead of 2 windings?? What is the function of the auxiliary winding?? Thx
Thank you for this video. Can I use the same transformer in Inverting Configuration? Can I do that by just swapping the wires on secondary?
Since a plain isolation transformer that can have 120 V going in and 120 V coming out, is there really a primary and secondary? Or when you connect one up can you use either set of wires for the primary and the other for the secondary?
I have a transformer from a UPS. It has two fat wires on one side, and three thinner wires on the other. I assumed (stupid I know) that the fat wires would be the primary, and plugged it into the mains as I wanted to check the secondary voltage (was assuming it would be 12-0-12, or even 6-0-6). It tripped the breaker.
I then measured the resistance of all coils. The fat side has a resistance of 0.4 ohms (does that mean its gone??).
If the thin side wires are A, B, and C; resistance between A&B = 26 ohms, A&C = 24 ohms, and B&C = 2.7 ohms - somewhere I was expecting much more resistance!! I'm measuring with the meter on 200 ohms setting, so pretty sure I'm not getting confused with K ohms.
So I will wait until I learn more before I try to plug in the other side....any help is appreciated!!
Gday LS I would have thought the secondary winding would have the thicker cable because in stepdown trany the secondary current is higher than the primary winding. I guess since the primary has the higher voltage the insulation needs to be thinker.
guys i have question. in a transformer with 2x main input(220/110v) wich is 220v?higher resistance or lower?
I have a transformer that only has a black and white wire for mains. I took it from a lamp and it was conected to a seperate ac socket along with a breaker switch. It says on the shell its .03 amps. Is this a ac repeater transformer? Or some kind of step down transformer? it has no secondary
at the beginning of you explaining the turns and resistance of the primary and secondary, I believe you explained this backwards as to the way it actually is. when you performed the resistance check, you stated the orientation correctly though. may want to have a listen and watch the video to double check.
If the mains voltage is 120V then the resistance of the primary is halved I assume. E.g 500ohms instead of 1000ohms. And the spark dimished too. I hope I’m not mistaken here.
i wish your channel was called ludite science
Good day... A step up transformer 12v-220v can use in other way to make a 12v charger? From Step up to stepdown....
bom trabalho
nice bro,but how to know what input volts in primary?
What of a transformer which the ac and DC ware are in thesame site, how identify the primary and secondary
Hello
Thank you for your informative videos.
Do you have a video about choosing the right winding wire size for primarily and secondary sides of AC transformers.
Waiting for your helpful reply.
Best regards. 😊 👍
.
Why dont bring smps transformer?
It has primary secondry and auxilery, winding.
Hard to find
I remember i used to plug in either side and see if the fuse shut off or not...
Either side can be primary or secondary...
The thing is what you want do do with it..
Step up or down
pro tip: watch series on Flixzone. Me and my gf have been using them for watching all kinds of movies recently.
@Pedro Emmett yea, I've been watching on flixzone for since november myself :)
@Pedro Emmett Yup, I have been using flixzone for years myself :)
Why are they not labelled?
how to identify primery side on ferrite transformer or smps transformer
Sir. In 3 wire 110 220 primary..how to find a 110 and 220
What if you don't know if it's step up or step down?
👍👍👍
Please make a video on INVERTER from COMPUTER ATX . AND THIS TIME PLEASE TRY HIGH WATTAGE (NOT LESS THAN 200 WATTS).
0:16 "Their function is to lower the main voltage ...", not exactly true :)
It's OK,but he did not mentioned step up and step down.
batticha shumami yeah don’t try to do that with a MOT
@@samhoff1724 To do what ? I just want to say that transformer is not only step down :)
It was a joke. MOTs step up 120 or 240 volts ac to 2.6 kilovolts.
And what is "exactly" true?..
the human body has resistance as welll... holding on to the thing your testing will effect the results... fyi
Thanks
@@ludicscience thanks for the nice response to an idiotic comment.... question: is there a way to tell whether a transformer is suitable for audio (wire count, colors, shape?) without being able to test? i occasionally will come across a bunch of transformers for sale, however they are unmarked (which is why i found your video, thank you for sharing your knowledge!) and it isnt possible to do much in the way of testing... the most i can do is bring a multimeter with me...
A transformer only works on alternating voltage (AC), so I would never do this measurement with batteries that provide a DC voltage.
DC voltage can damage transformers! You must apply a low alternating (AC) voltage with a variac, on this way you can easily and reliably find the primary side of the the transformer and also the transformer ratio because that is also important.
They are widely use ed? I believe you mean used.
1st
Identifying primary and secondary you showed is not true. Like others commented, step-up or step-down. Second, the size of the wire, color and how many grouped together means nothing. I have a transformer with two primaries that are 22 awg... 120 volts for each one. In parallel connection of two primary input voltage 120, in series connection of two primary inputs 240. One secondary with two 10 awg wires with an output of 13.5 v at 40 amps. All wires primary and secondary are black. So, please do not follow this rule of size, color and grouping! The best way is to just use the secondary of a known transformer (i.e. 12v AC) or a VARAC, connect to each two wires and read the voltages and go to the next two... with this method. You will be able to identify primary and secondary, plus all the taps without damaging the unknown transformer. As well as yourself.
How to know positive or nigative of too same color
Transformers are only connected to AC, and AC does not have polarity. There is no positive and negative. If you connected DC voltage to a transformer, you would just create an electromagnet.
You have to have AC's changing voltage to get anything out of a transformer. AC causes an electromagnetic field to build-up and collapse constantly and very quickly. This is what produces your output on the secondary.
first
Intro Always Deafens me...ROFL
Connect in serious? You mean series.
“Connect ..tooo….toooo wires “ 🤣 cmon give
Him a break his first language obviously isnt english so pretty sure he is smarter then half the world already that only speaks uno
Doesn't the word transformer mean to transform, to go up, like up high. So what is the deal with transformer as rule implying coming down from a higher voltage to a lower voltage. And once in a while of course to higher voltage.
It is surely a very confusing deal that the world of science got it screwed. No one wants to say step up or step down transformer as that is too many words. Besides step down transformer is pretty absurd by the very usage of words. How can you transform by going down? And science was suppose to most exact clear thing we are suppose to have. Of course there is more absurdity besides this.
I know it isn't "politically/socially correct to make race an issue but god-damn can someone who speaks English (as their primary language) to do a video !? I mean this is potentially dangerous stuff and i would like make sure i understand fully what is being said. 😮
The primary can be the secondary and the secondary can be the primary. It really doesn't matter , it depend what you want to do with it so your video is useless.