DC Voltage Amplifier Using Transistor

"how to amplify a dc voltage of 10mv using transistor"

Never heard of such a GOOD question. Thank you.

Amplify it to what voltage?
Do you mean using a single transistor?
What power supply is available.
I suggest you google 'single transistor DC amplifier' or look at any good basic electronics textbook or op amp data sheet.
Amplify it first and then worry about chopping it.
An op amp is probably a better bet.
Why are you doing it, experimentation just for the fun of it or why?
Del

It's a task given to me. I have to amplify given 10mv signal with a gain of 5. I have searched it. But i just found amplifier analog signals.

There you are.

DC is not amplified. At least, I have never seen one yet - an amplifier designed to amplify DC 10 mV. Of course one can use polemics, to argue on its existence.

Polemics are not necessary, education and experience work just fine:

http://en.wikipedia.org/wiki/Direct_coupled_amplifier

There are no capacitors coupling the stages therefore its frequency response is flat down to 0Hz, it forms the basis of analog computers and instrumentation amplifiers mentioned in other posts.

Preamble to your link says: "This article does not cite any references or sources"

Further it continues: "Direct coupled, also known as "DC amp", refers to a type of amplifier. In this type of amplifier, the output of one stage of the amplifier is connected to the input of the next stage directly without using any reactive components like capacitors, inductors, transformers, and others. As a result, the frequency response of this amplifier is quite flat all the way down to DC (0 Hz)."

Well, allow the above to sink-in.

There is no bibliography either, in support of DC amplifier.

What are you rambling on about?
Maybe I'm missinterpreting you, (sorry if I am) but I think you are confusing the issue by suggesting there is no such thing as a DC amplifier, which is a ridiculous assertion.

Amplifying DC may be a missnomer as DC can be taken to mean 'direct current' whereas in amplifier terms we generally mean amplifying a voltage level.
E.G. The output from a strain gauge or pressure sensor which will be a voltage level varying slowly with time rather than a 'conventional' AC signal as you would find from a microphone.
I have used DC coupled op amps to amplify such a signal coming from a pressure sensor measuring human breath, which is a pretty slow waveform.

However even in the purest contect of 'Direct Current' there is no problem amplifying a current, direct or alternating.
Del

I have no arguments. Non whatsoever. I believe, the expression, "DC Voltage amplifier" to be a misnomer. Surely, I will be allowed to say, what I believe in. Of course, I will respect your right to say a spade a spade.

Consider the following black box device which gives these results.
input 0v output 0v.
input 1mv output 5mv
input 2mv output 10mv
input10mv output 100mv
What would you call the device?
Del

Your black box is a switch, wherein 1mv input switches on 5mv, & so on it goes.

When the DC voltage moves up and down (even at a slow rate) we call it an AC & it is no longer DC.

That is why my post at #4

DC is not amplified. At least, I have never seen one yet - an amplifier designed to amplify DC 10 mV. Of course one can use polemics, to argue on its existence.

Then followed post #8 by RAMConsult:

Polemics are not necessary, education and experience work just fine:

Rest is history.

I firmly believe that:

When the DC voltage moves up and down (even at a slow rate) we call it an AC & it is no longer DC.

I do not have the desire/inclination/stomache to debate with all you venerable veterans of our CR4.

Therefore let us take a sabatical.

"When the DC voltage moves up and down (even at a slow rate) we call it an AC & it is no longer DC."
Ah ha!
At last, we've got to the crux of it!
No!...
You call AC...
Every other electronics design engineer on the planet calls it DC, some confusion arises because Direct Coupled also begins with DC.
In real world terms a slow signal (say my human breath output, which may last upto say 8 seconds) is too slow to pass through conveniently sized capacitors in an amplifier, thus the need for diect coupling.
In the pedantic sense you are right, but following your logic there is probably no DC anywhere in the world, as even the output from a 12v lead acid battery varies with time!
I think you need to accept the pragmatic 'definition' of the industryif you wish to be understood by your fellow engineers.
Del

Correct nomenclature should be 'Direct Coupled Amplifier' I agree to disagree. Period.

10mv is an analogue signal.
What is producing the signal and how does it vary with time?
Del

About 4,800,000 results (0.37 seconds) From a search engine by entering the title of your thread.

I would hope you could find something in these "About 4,800,000 results" that might help you do your homework.

<Shakes head in abject sorrow for the future>

An instrumentation amplifier would be a typical device for amplifying low level DC signals - such as one might obtain [say] from a load cell.

About 60 years ago I was doing research to establish basic (reference) levels of human skin conductance. This was essentially an offshoot of a lie detector type machine design.

I used a Wheatstone bridge to amplify these low levels of current up to something that could be measured by the analog meters of that era.

So, gringo. what you are doing is the same - it appears to me that you want to amplify current levels. Yes? No?

He is seeking for dc voltage amplifier that is chopper stabilized, and the reason for his 100KHz question.

Gajanan Phadte