piclist 2000\11\03\040819a >
Thread: Protecting a BJT
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face BY : David VanHorn email (remove spam text)



>Funny thing is when the motor switches off i see no reverse surge through
>the diode - again maybe i just don't have the right instrument to see this.

You probably won't without a current probe.
This sort of thing can happen so fast that it's unobservable on a 350 MHz
scope.

The protection diode should be at the transistor(the wiring has inductance
too) but in paralell with the motor.

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