Most technician textbooks do a very poor job of explaining the details of transistors' internal workings. First they assume that the Base current is somehow controlling the Collector current, then they try to explain how one current can affect another. These explanations invariably fail because Bipolar transistors, like FETs, are voltage-controlled devices. Reigns trilogy download for mac download. One current doesn't affect another. Instead, the Base-Emitter voltage controls the thickness of an insulating 'depletion layer' which lies in the path of both the Base current and the larger Collector current.
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NOTE: This article delves into bipolar transistor internal operation: it's the physicist's viewpoint; not the engineer's or technician's. While solving design problems, engineers must model the transistor as a current amplifier, or as a transconductance device, or as a charge-controlled current source. If you want to understand a transistor circuit, then the black-box model is what we use. But be warned, because if our goal instead is to 'open the hood' and see what's really going on inside, those useful black-box models can derail our understanding. Coloring pixels free.
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