12V 5A Switching Transformer Autopsy - How it's constructed? Is it safe?

Today I made an autopsy of the switching transformer from the 12V 5A power supply I was testing in the last video. So let's take a look how this ferrite core SMPS transformer is constructed and how safe it is.

The teardown of the 12V 5A switching power supply:

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[hackeritalics]

Some of the practical things that you do @DiodeGoneWild sir is incredible. I love watching you work because I learn a new "trick" just about ever time. lol

[jkobain]

I feel something missing and I click this video immediately.
Now I'm okay, thank you for your support!

[crocellian]

This is the best non-segmented core transformer of this size I've seen. Thank you for spending your time to put out such great stuff.

[drahtfunker]

Very nice! I always thought trying to recycle these transformers would be useless. But now I know there's a way of opening them withouth breaking the core. Thanks.

[electromatic]

Thnks for your videos. It would be amazing if you could show the core gap and measure the inductance of the primary before taking it apart. Keep up the good work

[zikermu]

I have been trying to troubleshoot an AC adapter for a laptop with a power of 330W, and thanks to you, I'm making progress step by step . The problem I encounter is the identification of the Coil of the active PFC. This one has a secondary winding which is on one side connected to the ground of the 2 MOSFETs of the PFC (they are in parallel) but I cannot find where the other side is connected. I told myself that it must be connected to an integrated circuit to detect a current crossing at zero (ZCD) but none of the legs of the 2 closest ICs correspond (the other ICs are on the 19.5V side (An OP2990 and a TEA 1995 ).In addition, these ICs are unreadable.The other problem is the identification of the primary of the output transformer.I followed the tracks with the ohmmeter and the inductancemeter but my diagram is not consistent with an LLC assembly The choke which is between the 2 MOSFETs has several connections (which I don't understand) and is surmounted by a radiator (which I understand) I am not looking for the values ​​(x milliHenry, etc.) of these materials but their installation and wiring I wrote to the company DELTA from whom I bought 5 of these power supplies but m, despite my reminders, they do not even have the decency to answer me.
Do you know where I can find this information. Thank you in advance

[TheSpotify]

Nice stuff, good to see a safe PSU from China! Also liked how you salvaged the LED at the end :D

[JoseSilveira-newhandleforYT]

Never thought that boiling ferrite transformers in water would release the glue so easily. I normally put them in a solvent for a couple of weeks and then disassemble them. Tried the oven once but had bad results and went to the solvent. I'm going to try the boiling water, but I don't have an electrocuting heater - I think the shock from the mains helped make the thing shiver and crumble :-)

[amicklich]

:D...Entertaining and educational at the same time. Much appreciated!

[igrewold]

Amazing! :) Boiling, never thought about it. Brilliant idea.
I tried to build a transformer on a small toroid. I used phone cable(ones solid wires). I wanted to have 2:1 (ex. 220:110, 110:55)
Did 20 turns on one side and 10 on the other, when I tested it on 110 v(actually 130), it burned/melted and sparked :'[
Poof, plugged it out. Dunno what went on! Or why! I figured since it was like 1 Ohm in resistance, it was like heater probably dealing with 130 amps or at least as much as that outlet was able to push, could be 10~20 Amps!

[REVERSE_BIAS]

Hi! Could you please do a video on switch mode transformers and their windings/pin layout please. I'm new to electronics and learn so much from your videos. One thing I'm struggling with is the inputs and outputs of transformers, where the windings are connected to the same pins like they were in this one...(auxiliary and secondary). Plus some transformers have 2 pins, some have 12!!! I'm sure it's simple, but the way you explain things is so brilliant that I know I'd leave the video no longer confused.

[smartgamersify]

Sir huge respect to you ..🙏 you give great knowledge to us

[janroed]

next time -- when you are going to investigate safety: The most important test you can make is a high voltage test between primary and secondary windings. This test shows if the insulation is sufficient between the 230V primary and the low voltage secondary...

[tejonBiker]

Some transformer use some high resistance glue, in this case you can use a hot hair gun, take precautions if you use a hot air gun, the surroundings can be very hot a and use gloves when you try to dissamble the hot core

[zxztv]

Ahh boil them, i wondered how to take them apart without breaking.:-D
Do you think you could make a better supply for 12v 5 amps?, just wondering :-).
Is the sheild to stop capacitive connection or some odd frequency effect?

[richardnanis]

Thanks for this informative video! I like when you examine things down to the ground!
Its a pity the Chineese exaggerate all the specs as they like. You never know what you get! The only thing youl could be quite sure about is they dont stick to their specs at all!
Most interesting is the light of little torches powered by just one liion cell and they claim you can get 6000 lumen or even more :-). But they also sell liion cells in 16850 format with 10000 and more mAh - as well - so it might work ;-)

[pcfred]

I need a video just about your awesome SMD soldering iron that you got there.

[manickn]

Diode the only thing more that you could have done is noted the gauge of the wire. If you do strip a transformer again it would be nice if you can include that information.

[TheJavaSync]

Sir ... Make a video how to modified ATX PSU (TL494) to audio Power Supply (centre tap) big Voltage & Ampere

[carlychat]

muy bien doc. quisiera saber qué número es el IC oacilador, espero de su respuesta gracias... saludos