Originally posted by Matthew Jones
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First, i completly disassembled my toroid wireing turn by turn (except the original primer, i simply cut it down because it was more than half cm wide). It was a slow process, but now i have the bare core to work with. It's 2cm tall with 8cm outer and 5 cm inner diameter.
It's made from many metal sheet, so this must be "electric steel". Electric steel's uR value are somewhere 500..4000, so i can calculate with it.
Second, the math. 100 turns of AWG21 fits perfectly in this core, and with the other parameters, this means 10..75mH per coil (depends on the real uR value). Transformer simulation in Tina shows that this parameters will be perfect for 100..200Hz operation.
One turn in this core will be 8.5cm long, so i need 2x 8.5m wire for the primers. With the toroid's ~95% efficency, then i choosed the secunder to 9.5m.
I'm doing the wireing now, we will see in monday how it works in real life. I have high hopes!
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