Need Help in Electronics devices

shteii01

Joined Feb 19, 2010
4,667
Seems simple enough. I think textbook should have example or two on how to solve this type of problem.
 

SneakSZ

Joined Sep 19, 2012
10
Use Thévenin to create an equivalent schematic at the base of the transistor.

Rb= R1//R2
Vb= (Vcc*R2)/(R1+R2)
Now you can find Ib ==> Vb = -Ib*Rb -0.7 -Ie*Re with Ie=Ib(beta+1)
Ib= -(Vb+0.7)/(Re(beta+1)+Rb)

Go back the orignal schematic and now you know what current is flowing out of the base.

Vcc = (I2+Ib)*R1+I2*R2 ==> Find I2
I1 = I2+Ib

Mind the signs.
 

Thread Starter

full

Joined May 3, 2014
225
Use Thévenin to create an equivalent schematic at the base of the transistor.

Rb= R1//R2
Vb= (Vcc*R2)/(R1+R2)
Now you can find Ib ==> Vb = -Ib*Rb -0.7 -Ie*Re with Ie=Ib(beta+1)
Ib= -(Vb+0.7)/(Re(beta+1)+Rb)

Go back the orignal schematic and now you know what current is flowing out of the base.

Vcc = (I2+Ib)*R1+I2*R2 ==> Find I2
I1 = I2+Ib

Mind the signs.
thanks bro
 
Top