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PRO-CUT 60
E-5
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.
THEORY OF OPERATION
FIGURE E.7 - Transistor Switching Operation