Darlington Pair/ Darlington Transistor

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Darlington transistors are designed to amplify weak signals and consist of two NPN BJTs connected in a specific configuration. To create a Darlington pair, the emitter of the first transistor is connected to the base of the second, and their collectors must also be connected together. Additionally, PNP Darlington pairs can be constructed using PNP transistors. The Sziklai pair, an alternative configuration, may offer certain advantages over the traditional Darlington pair. Understanding these configurations is essential for effective circuit design.
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Hey guys,

I just found out about these darlington transistors, and I read that the purpose of these transistors are to "amplify WEAK signals".

After taking a look at the circuit diagram for the darlington pairs, it seems to me that it is just 2 npn bjts with one of the bjt's emitter connected to the base of the other. Well I was wondering is this how you make a darlington pair?, you just get 2 bjts and connect one emitter to the base of the other?
 
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Larrytsai said:
After taking a look at the circuit diagram for the darlington pairs, it seems to me that it is just 2 npn bjts with one of the bjt's emitter connected to the base of the other. Well I was wondering is this how you make a darlington pair?, you just get 2 bjts and connect one emitter to the base of the other?
No, the transistors should have their collectors connected together as well. It is also possible to have a PNP Darlington pair.

It's worth noting that the http://en.wikipedia.org/wiki/Sziklai_pair" may have advantages over the Darlington Pair.
 
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