Why my LED is not blinking?

[Clovis]

Hello all, I am facing some problems for my circuit.

I want to get the LED lit up and start blinking but it is not blinking.

I have tried for many days but end up with the same outcome.

The oscilloscope shows the On Off Key graph.

Hope to get a reply soon. Thanks.

I attached my file with this post ad your references.

[supsup]

Schematic U1C, U1D should be changed

[Clovis]

@supsup,

You mean my circuit something wrong is it?

and the wrong part is the U1C and U1D?

So you're suggesting me to change U1C and U1D?

But I have done the circuit exactly the same with the diagram I was given.

By the way, do you got any explanation for the changes you made?

[supsup]

Circuit U1C and U1D is wrong in your file. The generator scheme U1C, U1D should be as in my file.

[Clovis]

Okay, in that case, by changing the position of the capacitor will solve the problem is it?

[supsup]

Open my file and start simulation. LED blinking?

[Clovis]

Yes the LED is blinking.

[supsup]

Whether there are still problems with this project out? What purpose of this project?

[Clovis]

We team are able to show the graph with oscilloscope and also make the LED blinking without doing those changes like what you do.

Our project is something related with modulating and demodulating wave.

See the attachment for more details.

The first picture is the circuit we suppose to do with multisim.

The second picture is the circuit the other team does.

The third picture is the graph that we suppose to get. - The on and off key, 0 and 1.

However, they did change some of the value and add in another buzzer.

I got another question, is the result i got from using multisim version 10 and 11 is the same?

It is because when I use different version of multisim, the result of the graph and the blinking of LED is not the same.

Hope this information help you.

[Clovis]

I am confuse whether how does the graph looks like.

This attachment is the graph produced by another team.