# BJT amplifier circuit

Discussion in 'Homework Help' started by curriejohn, Jun 16, 2015.

1. ### curriejohn Thread Starter New Member

Feb 17, 2015
14
0
Hi

Would some body be able to show me the correct format on how to calculate the Gain for the attached circuit.

I know Av = Vout/Vin but what is the best way to find out Vout!!!! Hope this makes sense.

Thank you in advance.

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May 31, 2014
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3. ### KLillie Member

May 31, 2014
126
14
This looks like homework. If it is, they do have a section for that. If not, I'm thinking you may have to make some assumptions about your circuit.

4. ### crutschow Expert

Mar 14, 2008
16,563
4,470
Do you need the exact gain equation or just an approximation?

5. ### WBahn Moderator

Mar 31, 2012
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MOD NOTE: Moved to Homework Help from General Electronics Chat.

6. ### WBahn Moderator

Mar 31, 2012
20,247
5,758
What do you know so far about small-signal analysis of BJT circuits?

7. ### curriejohn Thread Starter New Member

Feb 17, 2015
14
0
Hi Crutschow

I just need the equation that will give me the Vo of the attached circuit so i can then calculate the Gain Av. Its a part of my home study college work that i am completing to upgrade my qualifications. I come on here to get some professional help from guys like you as studying from home with no tutor is fairly difficult.

Thanks

8. ### mxg2579 New Member

Jun 10, 2015
15
7
Well like WBahn asked, do you know about small-signal analysis of BJT's? You will need to set-up the small signal analysis circuit and from there you will see Vin and Vout, and all you have to do is write some loop-equations, etc. to get Vout in terms of Vin.

If you look on wikipedia for "Hybrid-Pi model" there is a pretty good illustration of the model and the associated equations. See if that helps

Last edited: Jun 17, 2015
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Feb 17, 2009
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