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Re: Re: Re: Re: Positive ground..?!
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Posted by MarkB on January 29, 2002 at 20:04:48 from (64.79.80.109):
In Reply to: Re: Re: Re: Positive ground..?! posted by uh . . . Dell (WA) on January 29, 2002 at 08:17:27:
Dell, At the risk of stirring things up again: The only real difference between a negative ground alternator and a positive ground alternator IS the direction of the diodes. True, the diodes have to be insulated from ground, but that's always the case. (Even in a negative ground alternator, only three of the diodes have grounded anodes, the other three have their anodes tied to the three legs of the stator.) Yes, most power transistors tie the collector to the case. And I believe that you're right that the early power transistors were mostly NPN. (Mainly because NPN has the arrow pointing in the "right" direction for most engineers' simple minds to understand.) However, it is not true that NPN transistors require "negative potential" at the collector. For an NPN transistor to be properly biased, the collector must be at a positive voltage relative to the base and emitter. I have to believe that the almost simultaneous advent of semiconductors and negative grounding in the automotive world is mostly coincidence. Regards,
mark
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