LM324 oscillator does not function, why??

[spookm]

This is a typical noob question I am afraid..

From the datasheet of the LM324 I found (page 13) a circuit design for an oscillator. http://www.ti.com/lit/ds/symlink/lm324-n.pdf

I have been trying to reproduce this oscillator in MultiSim, but it does not work as it is supposed; even measure voltages much higher than the source voltage ??

Can anyone tell me what I am doing wrong?

[Tien_P]

Hi,

The LM324 have three different models, I selected the one made by National Semi and this circuit is now generating a pulse.  Double click on the LM324 then select the Replace button, in the "Model manuf" area, you should see more than one models.

[spookm · Accepted solution]

TYhnak you, it works great now.

The model manuf button shows only ITT/LM324A_2

Maybe this is also due to my ancient version 10?

Thnaks you very very much!

martin

[spookm]

Now I have a new problem with this LM324...

When I put more packages in a circuit, I cannot have U1A, U1B etc.

When I place the B component, I get a popup telling me that components are renamed.

I get strange pin layout and have to connect Vcc and GNd for every part.

See attachement

[spookm]

Thnak you.

it works great with this component.

I cannot save it to the database though.

it seems that I have two versions somehow conflicting.

Do I have to do something special to prevent trouble from using your Lm324 version.

is it automatically storesd in the databse obne I opened this file?

[Tien_P]

Since you already have this component in the Master database, you can edit it and add this model.  You can extract a model in a circuit by selecting Transfer>>Export Netlist, open the .cir file with Notepad and you will see the model. I've done it for you and the model is attached.

Have a look at this knowledge base to add a model to an exist component:

http://digital.ni.com/public.nsf/allkb/2373E75D8B375EA1862575D2004D9C88