# Request for circuit analysis

Discussion in 'Electronic Design' started by rajibbandopadhyay, Oct 21, 2012.

Dear friends,
The reason why I got stuck with electronic circuits just before biasing
will be clear in a short while.
Without the support of a good teacher the logic involved appears
formidable.
The pages attached relate to transistor as an amplifier and its biasing.
The book concerned is All.new.electronics.self-teaching.guide.2008. The
questions are posted on some of the attached pages themselves. The rest
attached pages are for logical continuity and completeness.
I will try to find a way on how to get those pages uploaded and then get
back.
Regards

3. ### Guest

specifically you don't understand. No one is going to do you
home work for you, you could at least pretend you tried to make
an effort

-Lasse

Typed on the pages.
Regards

5. ### Ian MalcolmGuest

That's NOT how it works. You are asking a bunch of complete strangers -
many of us highly paid professionals - to give up some of our time to
here so those of us who have no particular interest in the SPECIFIC
question can pass over it and to get the attention of those who wish to

<http://www.catb.org/esr/faqs/smart-questions.html>

On Sun, 21 Oct 2012 07:56:14 +0000, Ian Malcolm wrote:
I am sorry I could not explain myself better, and wasted your time. The
questions are contextual, so are posted on the pages themselves.
Regards

On Sun, 21 Oct 2012 07:56:14 +0000, Ian Malcolm wrote:

I am sorry I could not explain myself better, and wasted your time. The
questions are contextual, so are posted on the pages themselves.

I wanted to save your time by posting my questions on the pages
themselves. I believe it would definitely save your time.
Regards

8. ### WoolyBullyGuest

There are no friggin pages here.

The pages are in:
Page 249 has a circuit diagram.
Problem 9 is given near end of page and continues in Page 250. The
Problem 10 refers to the same circuit and defines voltage gain by a
formula. How this formula is derived?
Instability and solution is given in Page 253, Problem 11 and a circuit
diagram is given. Then formula for gain is given. But how this formula is
derived?
Page 256 has a problem 17 continued in page 257. Steps are given. But if
the gain part can not be derived then the solution can not be arrived at,
which are continued in page 258.

10. ### ehsjrGuest

The url you posted does not display large enough in either IE
or Firefox 16.0.1. What is visible does not show a diagram on
page 249.

To get answers, you will need to find a better way to ask your
questions. I'll try to give you a method: "ASCII art"

Here is what I can make out on page 248 in "ASCII art"
(Not shown is the sine wave input and inverted sine wave output)

+-------------------+
| |
[R] [R]
| |
| +---Vc
| |
| /
---[C]---+-----------------||
-----------------------------+

You can use the above diagram (if it is the one you have in mind)

Or you can find another way. We can't help if we can't see.

Ed

11. ### P E SchoenGuest

"rajibbandopadhyay" wrote in message [snip overly generalized questions]

The images are too small to read. And using the zoom in IE9 actually makes
the image smaller.

From what I can see, you have no idea how to apply Ohms Law, and you don't
understand basic transistor characteristics such as Vbe diode junction and
current gain. You may need to go back a few (hundred) pages and comprehend
the basic principles of circuit components.

Have you ever actually built a simple circuit?

Have you tried using a simulator like LTSpice?

http://denethor.wlu.ca/ltspice/ (a tutorial to get started)

Paul

12. ### IanMGuest

+1

Two hints concerning ASCII art and circuit diagrams:
You *MUST* use a fixed pitch font to view ASCII art or the lines dont
match up vertically. If you don't know which font to use, try "Courier New".

There's a utility for Windows called AAcircuit that helps you draw ASCII
art circuit diagrams. <http://www.tech-chat.de/aacircuit.html>
Simply use it to edit your diagram till you are happy with it, then use
its menu option to copy to clipboard, then paste into your next
newsgroup posting. The program is German but you can also select
English or Danish.

13. ### Robert BaerGuest

]
Query replied to privately.

15. ### Guest

You're not going to learn much from a book like that, it is just recipes. The gain equation for the uncompensated config beta x Rc/ hie is more symbolic than numerical since hie is all over the map depending on collector current swing.