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two emitter transistor, or multiple emitter transistors used for?

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Castillovanv

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i still don't understand why it has 2 emitters, can you please explain it better why it has 2 emitters, what does it do when having 2 emitters?

Does it output more current?

why the 2 emitters? what does having 2 emitters do? why not 2 bases? or 2 collectors?

How does this 2 emitter transistor work in the schematic please? IMG_20140301_061353_005.jpg

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Is the transistor an amplifier or Switch? how is it used? and how does it work?
 

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