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samtree Dear friendThe reason is that this coil ( 7 cm diameter) is practically HUGE for what you want to do. You must have a much bigger test specimen to obtain the power that this coil can deliver. Try with coils of a smaller diameter, let's say 5 mm larger than your test specimen. If you can find some copper pipe with inner diameter of about 3-4 mm, you can construct your own water-cooled coils and I believe you will get very good results from this device.

SOARES CARVALHO 12/03/2018
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