Maker Pro
Maker Pro

Can Some1 Tell How can I construct a simple Amplifier Using BJT Which Gives 80 gain

D

default

Jan 1, 1970
0
Can Some1 Tell How can I construct a simple Amplifier Using BJT Which
Gives 80 gain . yeah the frequency range should be atleast 1000
hertz ....... i can use Common collector , Common emitter , Common Base
(transistors), resisitors of course and capacitors .....Sounds like
everything...........Anyways can Some1 Give me the circuit or atleast
tell me how to construct 1


Regards,
Arafat Safdar


see
http://www.hobbyprojects.com/A/audio.html
 
Can Some1 Tell How can I construct a simple Amplifier Using BJT Which
Gives 80 gain . yeah the frequency range should be atleast 1000
hertz ....... i can use Common collector , Common emitter , Common Base
(transistors), resisitors of course and capacitors .....Sounds like
everything...........Anyways can Some1 Give me the circuit or atleast
tell me how to construct 1


Regards,
Arafat Safdar
 
T

Tom Biasi

Jan 1, 1970
0
Can Some1 Tell How can I construct a simple Amplifier Using BJT Which
Gives 80 gain . yeah the frequency range should be atleast 1000
hertz ....... i can use Common collector , Common emitter , Common Base
(transistors), resisitors of course and capacitors .....Sounds like
everything...........Anyways can Some1 Give me the circuit or atleast
tell me how to construct 1


Regards,
Arafat Safdar

Did you look for any?
 
Yeah I guess I did I have used 2n3904 transistor but i cant fiqure out
a way to construct it .... My circuit is not giving any gain

Regards,
Arafat Safdar
 
J

John Popelish

Jan 1, 1970
0
Can Some1 Tell How can I construct a simple Amplifier Using BJT Which
Gives 80 gain .

Are you looking for a voltage gain of 80?

What are the amplifier signal source impedance and load
impedance? The simplest, ideal case, would be a zero ohm
source and an infinite ohm load.
yeah the frequency range should be atleast 1000
hertz .......

Is there a lower frequency or must the gain go all the way
to DC?

i can use Common collector , Common emitter , Common Base
(transistors), resisitors of course and capacitors .....Sounds like
everything...........Anyways can Some1 Give me the circuit or atleast
tell me how to construct 1

Achieving a voltage gain of 80 from a single transistor is a
lot harder than getting a voltage gain of 9 or so from each
of two transistor stages.

I think you should start with some basic amplifier tutorials:
http://www.phys.ualberta.ca/~gingrich/phys395/notes/node74.html
http://my.integritynet.com.au/purdic/rf_amp.htm
http://www.hobbyprojects.com/junction_transistors.html
 
E

Eeyore

Jan 1, 1970
0
Can Some1 Tell How can I construct a simple Amplifier Using BJT Which
Gives 80 gain

A *voltage* gain of 80 ?

. yeah the frequency range should be atleast 1000
hertz .......

That's not a problem at all.

i can use Common collector , Common emitter , Common Base

Common collector ( more usually called emitter follower ) has no voltage gain.
Common base is normally just used for RF. Common emitter is the obvious choice
here.

(transistors), resisitors of course and capacitors .....Sounds like
everything...........Anyways can Some1 Give me the circuit or atleast
tell me how to construct 1

A basic common emitter circuit is very simple but before going any further it'll
be necessary to know the following.

What's the.....

Supply voltage
Typical or maximum input volthage.
Source impedance
Load impedance ?

Note - this will be AC coupled - i.e. not a DC amplifier.

Graham
 
J

John Popelish

Jan 1, 1970
0
Yeah I guess I did I have used 2n3904 transistor but i cant fiqure out
a way to construct it .... My circuit is not giving any gain

Please show us your circuit, and describe how you think it
works. That will give us two starting points, a given
circuit, and a given mind.

If you don't have a way to display the circuit somewhere on
the web that you can link us to, you can draw a schematic
and post it here with this tool:

http://www.tech-chat.de/aacircuit.html
 
Top