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Newguy:

--- Quote from: sebosfato on October 30, 2018, 10:19:32 am ---you can also use a esp32 node mcu that can display on a lcd the internal hall effect sensor value..

--- End quote ---
How about current sense for feedback when the magnetic field dictates a resonate condition?
Hfe :
http://www.learningaboutelectronics.com/Articles/What-is-hfe-of-a-transistor

Newguy:
http://thesignalpath.com/blogs/2011/08/21/op-amps-pwm-and-ignition-coils-tutorial/

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