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Darlington Pair Tutorial

Darlington Pair

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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