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Forward bias for a diode or bipolar transistor base means to apply voltage in the direction that it conducts. Thus for a diode, it's positive voltage on the anode with respect to the cathode. For a transistor, its positive base-emitter voltage for an NPN, and negative base-emitter voltage for a PNP.Edit:
Can someone explain to me what bias or biasing (forward bias ) means.
Judgeing from something I read on the net I think it has something to do with this I call polarization.
I can't find anything definitive on Wikipedia.
What's not to like:
I would like to control it with ttl 5v signal and drive 12V bipolar step motor. (I'll use two hs)
So I just reverse the power and exchange PNPs and NPNs ?