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A type of bipolar transistor comprised of n-type semiconductor in contact with p-type semiconductor which in turn is in contact with a n-type semiconductor -> thus NPN. The transistor has three terminals, the Emitter, Base and the Collector. Current injected into the base controls the flow of current from Emitter to Collector enabling amplification and switching.

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I have a doubt and I cannot find a certain answer on the internet. All NPN transistors should work in the same way?, I mean, the only difference in all the models are just the rating currents and … voltages? My question is driven as I want to control the speed of a DC motor with an Arduino, and the suggestion is to use an NPN transistor, and on the example they use the BUF654, but on my country …
asked Jul 28 '18 by Ronald Petit