# Need Help in Electronics devices

#### full

Joined May 3, 2014
225 http://postimg.org/image/5h0y8pn6x/
thanks a lot

Joined Jul 18, 2013
19,037
...............and the question is???
Max.

• full

#### 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.

• full

#### full

Joined May 3, 2014
225
Seems simple enough. I think textbook should have example or two on how to solve this type of problem.
http://postimg.org/image/74ghsdpul/

if simple for u !
can u explain how get answer i1 and i2?

thanks #### 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.

#### 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