> 3. RC on transistor base - Even just increacing base resistor value can
> slow
> down turn off time appreciably for no extra component cost, slower EMF
> spike => lower EMI.  Works with BJT and MOSFET. Add C where
> necessary. There will be dynamic power dissipation in the transistor as it
> turns off, need to check SOAR carefully.


Depending on implementation, this can be the lowest cost and lowest EMI.
If you can get there just adjusting the resistor value, then it's a zero
cost option.
If you don't make an emi spike, then you don't need to supress it.
All the other methods are absorbing a spike already made.
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