How to Make Transformer Bobbin | Coil Winding Bobbin

Here I make Bobbin using hard paper.
This bobbin make for 100 ampere welding machine.
The transformer core size is- S9
Stack size is- 135mm.

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Some Video Link Here
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100 ampere 40V Transformer | Welding machine
https://youtu.be/3nae_LjjrHw

How to calculate winding of transformer. Volt per turn.
https://youtu.be/6za59nI4PPo

50 AMP Welding Machine
https://youtu.be/XhK4gQaMkbs

80 AMP Welding Machine
https://youtu.be/rlTvZtCKJqQ

100 amp welding machine | How to make welding machine at HOME|DIY
https://youtu.be/1SNzPyD509o

400 amp welding machine
https://youtu.be/tSVozJsbQHA

220 amp welding machine restoration
https://youtu.be/d3jhbBE7I_g