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/sci/ - Science & Math

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9444219 No.9444219 [Reply] [Original]

What is the use of a collector in an n-p-n transistor. Wouldn't it conduct with just an n-p junction and a high voltage battery connected to p?

>> No.9444233
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9444233

>>9444219
Because that's a diode.

>> No.9444240

>>9444233
If the diode is forward biased, it conducts. I can't understand the purpose of the collector, the battery Vc attracts the electrons whether the collector is present or not.

>> No.9444242

>>9444219

Batteries are inefficient.

>> No.9444250
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9444250

>>9444219
>a high voltage battery
... thus defeating the purpose of a low-voltage current amplifier ... brilliant!

>> No.9444264

>>9444250
Vc is the battery connected to the collector base junction. The low voltage battery in current amplifier is connected to the emitter base junction.

>> No.9444266

>>9444219
>>9444240

The output would be input + high voltage battery - ~0.7V. So you get say 11.3V(0) and 16.3V(1) with a 12V battery. Instead of getting 12V(0) and 0V(1) with a npn transistor.

>> No.9444279

>>9444266
The input voltage gets amplified times β. Still doesn't explain role of collector.

>> No.9444295

http://hyperphysics.phy-astr.gsu.edu/hbase/Electronic/npncc.html

>> No.9444297

>>9444295
Just what I needed, thanks. My textbooks don't mention anything.

>> No.9444466

Just think of the transistor as a controlable switch, the current through it is controled by the base. The terms collector and emissor are just used to indicate polarization.