DiY PEMF test to use back EMF inductive spike energy for PEMF TX from high inductance PEMF COIL(2mH) 

with a high inductance COIL, the slew rate of the START PULSE, dv/dt, is too slow for biologic effects according to NASA PEMF study/BOB DENNIS PHD.
(- slew rate needs to be less than 100 μS)
however, the inductive spike from the PULSE's ending/stopping,
the 2mH COiL's MAGNETiC FiELD COLLAPSE, may still contain enough energy, and be useful for PEMF Therapy, since it does have a high dv/dt , very sharp, very fast slew rate
imgur.com/a/5a...
the back EMF spike, when connected to a 10 ohm resistor/identical coil on top of the PEMF EMITTER COIL, shows on the hardware scope about 6 volts
and - 'OHMs' out - to be about almost 4 watts of energy into a 10 ohm resistor...considering loss of efficiency from PEMF EMITTER COIL to PICK UP COIL into 10 ohm resistor, the original PEMF back emf spike energy may be significantly higher ... etc...