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Plz help transistor problem

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Ezugudor

New Member
Plz guyz,
how do i get the base voltage and current of a transistor.
Do i need to use the base resistor value?if yes how do i do that
 

Reloadron

Well-Known Member
Most Helpful Member
Plz guyz,
how do i get the base voltage and current of a transistor.
Do i need to use the base resistor value?if yes how do i do that

Start by reading this.

You haven't told anyone much. Present a circuit or explaining in detail what your goal is would help. The link affords a basic overview.

Ron
 

Ezugudor

New Member
plz i still dont understand the link.just want to know how to calculate the base voltage and current when reading a schematic diagram
 

Reloadron

Well-Known Member
Most Helpful Member
plz i still dont understand the link.just want to know how to calculate the base voltage and current when reading a schematic diagram

It depends on the transistor being used. All transistors are not created equal and they are not the same. There is no way to answer your question which is what I was getting at. The link tells you how in a basic application to calculate base resistors. You can't just toss out "a transistor" and expect a simple answer when there are thousands or transistor devices and each has a data sheet. If you are looking at a drawing using for example a 2N2222 basic switching NPN transistor then you would pull up a data sheet for that transistor.

Maybe someone else has a thought...

Ron
 

crutschow

Well-Known Member
Most Helpful Member
Typically the base-emitter voltage drop of a silicon bipolar transistor is one diode-drop or about 0.65V. You subtract that from the base resistor to emitter voltage to get the voltage across the base resistor. The base current is then the resistor voltage divided by the base resistor value.
 
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