How much back EMF volts can I get from positive 35v DC on+ off, at 6 amps DC , to inductor 1.75 millihenry to 10 ohms resistance to ground? I need = > 100volt over the resistance. Fast type diodes inverse parallel. The Formula depends on speed of a switch type as solid state transistor, (from it's data sheet part number), and amount of inductance. I have neon bulbs type variable voltmeter 110 to 470v. Is there a simple diagram to test this as actually flashing? E = L X di /dt

Or maybe the main line has resistor only, and charges coil L on the side, same time. Then coil L reverses back and sends high volts through resistor to ground in same original direction as positive power supply.

Or maybe the main line has resistor only, and charges coil L on the side, same time. Then coil L reverses back and sends high volts through resistor to ground in same original direction as positive power supply.

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