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Winding Transformers and Coils


i would need your help in designing transformers for rechargeable lamps. i really don’t understand what the dots in front a coil stands for. all help (including pictures) would be really appreciated. my own just packed a few days ago and i would love to recoil the transformer.

mail from LA

You will have to do a lot of study in the internet, and experimentation too. Transformer winding is a specialized profession not a hobby at all. You can wind some coils or small signal transformers, that is ok. Please do not try to wind mains or 230/110 V transformers at home.


I can only give some tips, precautions and techniques to a winder. study these links….

Electrical Formulas, Calculations, Basic Electronics Engineering
I have put the link of a page but see all the pages of the website. The Dot polarity in a transformer stands for the direction of winding relative to each other. The Direction of winding could be clockwise or anti-clockwise.


Hi, I have a DV 4295 small Transformer (salvaged from an unknown purpose PCB)Pri: 1x220V 50Hz, Sec: 2×17.5V 2×1.5VA (2×2 pins). There is no indication on the housing about dot polarity and no datasheet could be find. How can I determine the dot polarity of the Secondaries? THX

Mail from HF

Transformers Series and Parallel Connections

Series and Parallel Connections in transformers. Observe the Dot-Polarity. When windings are in parallel the current capacity doubles.

Transformer Polarity

An understanding of polarity is essential to correctly construct three-phase transformer banks and to properly parallel single or three-phase transformers with existing electrical systems.



Product Design - Industrial Automation and Instrumentation.

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