Need Help in Electronics devices

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
 
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