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The emitter current of
Tr1 is the base current
of Tr2.
A change in base current
of Tr1 can give a change
100 times larger in its
emitter current.
A change in the base
current of Tr2 has a
similar effect on its
emitter current.
Therefore there is an
overall amplification of
100 x 100 = 10000 times.
This circuit is
sometimes called the
Super Alpha Pair.
It is often used as a
power output stage.
The two transistors can
come in the same
package.
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