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

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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

Biasi wrote:

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.

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

i can use Common collector , Common emitter , Common Base

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:

A *voltage* gain of 80 ?

That's not a problem at all.

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.

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

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: