Any one can help me please to create it please.

 

Hello,

The 741 can not work on 1 Mhz.
The gain is to low.

Bertus

 

Hello,

The 741 can not work on 1 Mhz.
The gain is to low.

Bertus

I got a project and it's mention I have to use Lm741 OPAMP only

 

Hello,

The 741 can not work on 1 Mhz.
The gain is to low.

Bertus

Till what frequency it will work

 

Hello,

Then the project has the wrong setup.
For 1 Mhz the 741 can not provide the needed gain.

Bertus

 

Hi HaNo,
Welcome to AAC.
Do you have circuit to post that you consider would work with a 741?
The 741 specification is very limited.
E

 

Hello,

Then the project has the wrong setup.
For 1 Mhz the 741 can not provide the needed gain.

Bertus

At up to whats frequency it will work

 

Hi HaNo,
Welcome to AAC.
Do you have circuit to post that you consider would work with a 741?
The 741 specification is very limited.
E

This Circuit can be given a reference

 

Except as a mathematical equation on a sheet of paper, there's no such thing as a "pure" sinewave. Any such specification is meaningless. What is the criteria that your sine wave has to meet in order to be considered pure enough (i.e., acceptable)?

Since you opamp is going to have to have some gain in order to compensate for the losses in the frequency-selective network, you will be limited the gain-bandwidth product divided by the gain (as a rough guide). The further you are below that, the better your circuit will work (i.e., the purer your sinewave will be), again, roughly.

A 741 is generally considered to have a gain-bandwidth product of somewhere around 1 MHz, so you will probably be doing good to get a decent Colpitts oscillator running at much over 200 kHz to maybe 300 kKz.

 

Thanks for your time
I request you to help me out for a circuit.
I told the exact topic I was given for the project.
Searching the internet I have not got any reliable source to work .
I request anyone can help me with a circuit.

 

Thanks for your time
I request you to help me out for a circuit.
I told the exact topic I was given for the project.
Searching the internet I have not got any reliable source to work .
I request anyone can help me with a circuit.

It is YOUR homework assignment. You need to show YOUR best attempt to solve it. So far, you haven't even shown a start, which indicates you want someone to spoon feed a solution to you. That's not how it works here.

 

You have mentioned a "colpitt oscillator to create a perfect sinewave frequency up to 1Mhz using 741 opamp"

Besides the fact that no "perfect" sinewave can be produced - what means "up to 1MHz" ?
Do you need a tunable oscillator? Or is a fixed frequency (max. 1 MHz) required?

 

I just need to display it on the oscilloscope I think it's a fixed one.
U are right perfect not be produced.

 

No that's not right I have tried many circuit but not got the desired.
The output is coming just a straight line.
These are the following circuit along with output I have tried.

 

hi H,
This is an example of a working Wien Oscillator with feedback control, working at approx 1.5kHz.
E

 

No that's not right I have tried many circuit but not got the desired.
The output is coming just a straight line.
These are the following circuit along with output I have tried.

Did you realize that the one and only problem is the requirement: LM741 at 1 MHz?
(When I am not wrong, you oscilloscope shows a fundamental frequency of app. 5 kHz only, right?)
The problem with 741 types is not only the small-signal bandwidth (app 1 MHz) but also the limited slew rate (large-signal rise time).
Such slew rate induced distortions can be observed as "straight lines".

 

I needed to design a colpitt oscillator not wien. Guide me the main problem I am facing is the spefied opan 741 has to be used.
If 1Mhz is not what is max frequency I can obtain

 

Yes I realised that to obtain 1Mhz in 741 is not possible in colpitt circuit can u guide the amount of frequency I can obtain in a colpitt using 741.

 

hi Ha,
Check out this Colpitt video design link.
E

 

Yes I realised that to obtain 1Mhz in 741 is not possible in colpitt circuit can u guide the amount of frequency I can obtain in a colpitt using 741.

I already addressed that.

But that's really neither here nor there. Your assignment specifies a Colpitts oscillator, so you aren't free to pick some other oscillator topology, correct?

Your assignment apparently also specifies 1 MHz, so are you free to pick some other frequency?

We don't know -- we don't have your assignment or know what your instructor has told you about the restrictions and expectations.