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<p>
This shows
a <a href="http://en.wikipedia.org/wiki/Current_source">current
source</a>, a device that provides a
constant amount of current (1.4mA in this case), regardless of the position
of the switch. The transistor's base voltage is fixed at 1.98V
by a voltage divider, which causes a fixed amount of current to flow
through the base (14µA). The collector current will be
100x that, as long as the collector voltage is not too low relative to
the base.
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