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What does this transistor do?

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dietert1:
When using mosfet switches, the 3V zeners V21 and V31 have to go. Or you replace them by 15V zeners. Otherwise the mosfets won't switch properly. And with mosfets the current limiting resistors should really be more like 2 Ohms or so.

Regards, Dieter

David Hess:
The top transistor is the brake for the motor.

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