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THEORY OF OPERATION |
FIGURE E.7 - Transistor Switching Operation
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TRANSISTOR SWITCHING
OPERATION
A transistor is a solid state device consisting of three layers of silicon crystal. These three layers form the emitter, collector and base regions of a transistor. They are used at high frequencies in high power applications and switching circuits. When used as a switch the transistor will be "turned on" (collector current flow) when there is
adequate base drive current. Likewise the device will be "turned off" (no collector current) when there is insufficient base drive current. The tran- sistor allows the control of a large amount of cur- rent flow through the collector and emitter with a much smaller current in the base circuit. See Figure E.7.
