thx gramo for your post ^_____________^


Mr arod ^__________^

thank you very very very much for your help....

I will do more recerch to understand it completely


Iam very pleased with you sir

That's very kind of you

I'll do my best

thx again

^_______^

 

It's me again

It's a good start what Mr groma said

Now I need to explain how R1, R2 and R4 set the bias for the NPN transistor.


And then I should explain how R3, R4 and C3 set the gain through the amplifier.

After that explain the effects of C1, R1, R2, and C2 and R3 on the amplifier bandwidth. And using typical specs for a small-signal transistor like a 2N3904, draw the Ic vs. Vce curves like I show, with appropriate Beta gain considerations in the fan of lines, and I should draw the load line, and show how if varies with frequency.

I know all that steps I must do ???

But the problom I don't know how to make a start
or how to solve those steps I told ???

would anyone mind helping me please ???

^______^

 

Your teacher should teach you how to make a start.
Your teacher should teach you all about the simple transistor amplifier so you can understand how to solve the steps.

Why should we be your teacher?

__________________
Uncle $crooge

 

audioguru

I didn't said you should be my teacher ???

I know my teacher should do all that ...!!

but today weekend !!

so I should do my work even if the teacher not her .

I should ask for help

I think this forum for help

Not for teezing peaple who have dificulteis with their work !!

so please read what I wrote in my POST before

I wrote -- if anyone dob't mind help me ???

not if anyone teez me


thx alot anyway

I felt sorry to ask for help ):

 

You won't learn anything if somebody else does your homework for you.
You need to learn about the basics of electronics. Resistors, capacitors and transistors.
Then you need to learn about analysing existing circuits and designing new circuits.

__________________
Uncle $crooge

 

I know what you mean sir

but I want some one to explain for me how to do it

not just do it

coz I want to learn mate

thx again ^___^

 

He means that we cannot teach you everything there is to know about electronics. You need to find things out for yourself. If we did all of the work for you, you would not learn anything.

__________________
I also post at the following sites:
http://www.stop-microsoft.org http://www.heated-debates.com
Screen name: Aloone_Jonez

 

this is a circuit of voltage diveder biasing of common emitter u can find it more it is availiable in devices book or u can search it on internet

__________________
RANA SOHAIL

 

hell i'll take a shot at it. c1 and c2 block dc, q1 is the transistor used to amplify the voltage. r1 and r2 form a voltage divider to set up the bias voltage on the base of the transistor ( remember the magic number .707 ).c3 changes the impedance from the emiter to ground with frequency cuaseing the gain to change with frequency. i might need some help with r3 and r4. i think they form a voltage divider and the the varying resistance of the transistor causes the output voltage to change.does that sound correct everyone? its been a while since i have studied transistors i need to find my textbook and brush up.

mabey the op just needs a little help to get over a hump. sometimes i can't see the forest through the trees and just need a helping hand.