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Doubt in notation

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neo_star

New Member
why the supply voltage for a transistor is given Vcc and not Vc ?
i know that the question is a kind of akward but please help.
 

MikeMl

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Then what would you call the collector voltage? Vcc is used as the supply name which is connected to the other end of the load resistor, i.e., one end of the load resistor is connected to Vcc while the other end is connected to Vc. Supply nodes are usually named Vcc, Vdd, Vee, Vss, etc.
 
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smanches

New Member
I don't understand what you're explaining MikeMi. Where is Vc?
 

MikeMl

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I don't understand what you're explaining MikeMi. Where is Vc?
Vc is usually used to refer to the voltage at the Collector with respect to "ground"; while Vce is usually used to refer to the voltage difference between the Collector and the Emitter.
 
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smanches

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Vc is usually used to refer to the voltage at the Collector with respect to "ground"; while Vce is usually used to refer to the voltage difference between the Collector and the Emitter.
There where is Vcc?
 

crutschow

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Vcc is just another name for Vc.
 

smanches

New Member
Vcc is just another name for Vc.
Ok, that's what I thought and what the OPs original question was I think. He was wondering why it's called Vcc and not just Vc. As in why two c's?

And if he wasn't asking that, I am. :)
 
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MikeMl

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Vcc is just another name for Vc.
No, Vcc is the supply name, and Vc is the Collector voltage. There is usually a resistor between these nodes in most CE transistor circuits, so they are not the same node or the same voltage.
 

OutToLunch

New Member
from what I recall, the double letter notation is meant for commonality and to distinguish that rail from an individual collector (or emitter or drain or source) voltage. So one or more collectors can be tied to Vcc while Vc refers to a single collector voltage.
 

neo_star

New Member
my question wat why there was 2 c instead of one c
thanks for the answer
 
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