Tractor Talk Discussion Board |
Re: Re: Re: Re: Positive ground..?!
[ View Follow Ups ] [ Post Followup ] [ Return to Forum ]
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
Follow Ups:
Home
| Forums
Today's Featured Article -
Picking Corn - by Rick Nikolich. It was the day before Christmas shutdown at work and I asked our lead engineering expert Scott Andrzejewski what he was going to do over the holidays. He said that he had some corn that he still needed to pick with an antique one-row New Idea corn picker. Scott has a nice farm about an hour north of Lansing in St. Johns, MI. He wanted to get the rest of his corn in by the next day (Christmas Eve). We had about an inch of new snow on the ground and single digit temperatures. So in the bac
... [Read Article]
Latest Ad:
Sell 1958 Hi-Altitude Massey Fergerson tractor, original condition. three point hitch pto engine, Runs well, photos available upon request
[More Ads]
Copyright © 1997-2024 Yesterday's Tractor Co. All Rights Reserved. Reproduction of any part of this website, including design and content, without written permission is strictly prohibited. Trade Marks and Trade Names contained and used in this Website are those of others, and are used in this Website in a descriptive sense to refer to the products of others. Use of this Web site constitutes acceptance of our User Agreement and Privacy Policy TRADEMARK DISCLAIMER: Tradenames and Trademarks referred to within Yesterday's Tractor Co. products and within the Yesterday's Tractor Co. websites are the property of their respective trademark holders. None of these trademark holders are affiliated with Yesterday's Tractor Co., our products, or our website nor are we sponsored by them. John Deere and its logos are the registered trademarks of the John Deere Corporation. Agco, Agco Allis, White, Massey Ferguson and their logos are the registered trademarks of AGCO Corporation. Case, Case-IH, Farmall, International Harvester, New Holland and their logos are registered trademarks of CNH Global N.V. Yesterday's Tractors - Antique Tractor HeadquartersWebsite Accessibility Policy |
|