Transistor Biasing and equivalent circuit

Thread Starter

ZeroBlank

Joined Jan 22, 2017
14
In the
bias3.gif
Dual Feedback Transistor Biasing
i cant seem to understand what all the Vcc and Vin are applied, i already know that the Vcc is applied over the the whole wire to the right and to the left,however,what i dont seem to get is how we deal with RB1 and RB2 and on what bases?
why is the current in RB1 = IB + IRB2 when the current of the IRc = Ic + IRb1 ?


I saw this video on youtube showing that the both the base-collector and emitter-base are forward bias,how come there is always one forward and one reverse?
 

hobbyist

Joined Aug 10, 2008
887
why is the current in RB1 = IB + IRB2 when the current of the IRc = Ic + IRb1 ?
The current that flows through RC is made up of the two branch currents, the current flowing through the transistor "(IC)" and the current flowing through RB1, "(IRB1)".

The current flowing through RB1 is made up of two branch currents, the base current into the transistor, "(IB)", and the current flowing through the resistor RB2, "(IRB2)".

If you would like an example of biasing this circuit using the equations in the box, reply.
 
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