Solving Circuit Problem with PNP-Common BJT Transistor

[migelo]

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Hi all. I'm new in this forum. and i thought to say welcome with a problem what makes me crazy. It is a pnp-common bjt transistor. made of silicon. the emittor current, the collector current and the base current are asked in the condition of Vin=0V. (alfa=0,98) However when the teacher wrote the kirchhoffs rule for the emittor circuit and the collector circuit, he wrote:

for the emittor circuit:
Vee-Veb-(1-alfa)Ie*50-49*Ie=0
he took 0,6 for the Veb cause it is silicon. it is ok. and from here Iee comes out 0,002A.

but for the collector circuit:
Vcc-Vcb-1,98Ic+0,1=0
how 0,1 can be here? there is Ib*Rb. right? we had found 0,002A for the Ie. and when put it in the Ie=Ic+Ib equation, and use the Ic=alfa*Ie, we found 0,00004A for the Ib. and if we multiply it with Rc; 50ohm, we found 0,002A. so where is the +0,1?

we asked the confusing to the teacher, however he didn't give us a saturating reply. so i thooght to ask it to you. i will be waiting for your answers.

and also, i generally need a textbook which has got plenty of example problems. (especially about transistors) could you give me some suggestions?

 

[migelo]

http://img41.imageshack.us/img41/9358/circuitw.jpg
sorry, i forgot the circuit picture. here it is.

 

[tomcue]

]

Hello and welcome to the forum! I can understand your frustration with this circuit problem. It seems like the teacher may have made a mistake in the equation for the collector circuit. It is possible that the 0.1 value was meant to represent the base current, but it should have been labeled as Ib instead of Ic. This would make sense since the base current does flow through the 50 ohm resistor, causing a voltage drop of 0.002 A * 50 ohms = 0.1 V. However, without more information about the circuit, it is difficult to say for sure.

As for textbooks, there are many resources available online and in books that cover transistor circuits and problem solving. Some popular textbooks include "Electronic Devices and Circuit Theory" by Robert L. Boylestad and Louis Nashelsky, "Microelectronic Circuits" by Adel S. Sedra and Kenneth C. Smith, and "Electronic Circuits for the Evil Genius" by Dave Cutcher. It may also be helpful to search for online tutorials and practice problems to supplement your learning. Good luck with your studies!