transformer replacement; problem with legs

Thread Starter

sadiq3210

Joined Jun 14, 2013
26
I have a device whose transformer is broken.
This transformer has 6 legs; 3 on each side.
Now i want to replace it.
I took a similar transformer from a mobile charger.
This transformer has also 6 legs but 4 legs on one side and 2 on other side.
So, i can not connect it directly.
Now i want to connect the transformer by using wires.

Can you please tell me, where i connect each leg?

If you want more information, you can ask.

i attached a picture; the transformers look like that
 

gerty

Joined Aug 30, 2007
1,305
I have a device whose transformer is broken.
This transformer has 6 legs; 3 on each side.
Now i want to replace it.
I took a similar transformer from a mobile charger.
This transformer has also 6 legs but 4 legs on one side and 2 on other side.
So, i can not connect it directly.
Now i want to connect the transformer by using wires.

Can you please tell me, where i connect each leg?

If you want more information, you can ask.

i attached a picture; the transformers look like that
No picture shown.. Are you using all six connections on the old transformer
 

Ramussons

Joined May 3, 2013
1,404
I have a device whose transformer is broken.
This transformer has 6 legs; 3 on each side.
Now i want to replace it.
I took a similar transformer from a mobile charger.
This transformer has also 6 legs but 4 legs on one side and 2 on other side.
So, i can not connect it directly.
Now i want to connect the transformer by using wires.

Can you please tell me, where i connect each leg?

If you want more information, you can ask.

i attached a picture; the transformers look like that
What is this device? Can you post some photographs? Of both the component side and the pattern side? At least we may get some clue.

Ramesh
 

Thread Starter

sadiq3210

Joined Jun 14, 2013
26
the device is a hair trimmer. i has two batteries of 1.2 V connected in series, it means a total of 2.4V.

see the pics
broken.jpg

good.jpg
 

PackratKing

Joined Jul 13, 2008
847
You need to know the voltages of the transformer before you can swap it.

Additionally, you will have to identify which leads are the Primary / secondary. Using wire beyond that leaves you with the issue of how to mount it in your equipment.

It seems no two transformers are ever wound the same, unless you are into production of one item that only needs one design...
 

Ramussons

Joined May 3, 2013
1,404
Ok, that confirms that it's not a 50 Hz transformer but a a SMPS trasformer which will have a Primary, Secondary and a feedback winding.

No, you cannot use the transformer from a mobile charger.

A mobile charger also has a SMPS transformer with similar windings, BUT different Terminals, No of Turns, Polarity of windings.

And the mobile transformer is wound for a 5 Volt output, you need 3 Volts.

May be you can try for a replacement from the manufacturer. Else, you can do a rewind of the Mobile charger transformer with the same windings as the original and hope that it works.

Ramesh
 

PackratKing

Joined Jul 13, 2008
847
now i want to join the broken transformer. i found the 3 terminals but where are the remaining three?
If the equipment in question is old / used enough to break down in this manner, I would opt to simply replace the equipment with new, and cut my losses.

Repairing transformers is an art, with very few artists :D
 

Thread Starter

sadiq3210

Joined Jun 14, 2013
26
i want to make a new transformer. i broke the outer structure of broken transformer and i took the coil.
then i started to open the winding, i unwraped a long wire and after that it finished.
then i removed a green layer of plastic between the two winding.
then i started to unwrap the inner winding. during unwraping the inner winding, i see that either the wire broke or it might be already cut and it was made up of two pieces of wire. I am not sure about that.
then i unwraped it completely. now i have three pieces of wires. i'll tell u the length of these soon
what you have to do is to tell me how to make new winding
 

Ramussons

Joined May 3, 2013
1,404
Now we know that the outer winding was the Secondary (output)
Inside the Green Plastic layer, the Primary with a Feedback winding.

I hope you noted down:

The Coil Termination Lug Number,
The Number of Turns,
The Direction of Turns

Ramesh
 

Ramussons

Joined May 3, 2013
1,404
We'll need to know the

Number of Turns
AND the
Terminal numbers.

An attempt can then be made to duplicate the transformer on another core.

Ramesh
 
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