Hi,
I am designic a RC Wien oscilating generator,that would have Total Harmonic Disortion < 1%,and this is my main problem.
My circuit shold generate:
1Hz-20Hz: R<0-1,5k> C=51u
20Hz-200Hz: R<0-1,5k> C=5.1u
200Hz-2kHz: R<0-1,5k> C=510n
2kHz-20kHz: R<0-1,5k> C=51n
I am designing in PSpice 9.2,what is my main problem?
Thank You very much for any answer
Regards

 

Hello,

Can you post a normal schematic (best in png format, jpg is lossy) ?
I can not use the files in the zip.

Here is a page from the EDUCYPEDIA on sinewave oscillators.
http://www.educypedia.be/electronics/analogosciltypes.htm
Wien bridge oscillators are down the page.

Greetings,
Bertus

 

My schematic i-png in attachement.
Thank you

 

Hello,

You are trying to use an AGC with your oscillator.
Look at figure 15-12 in the attached PDF, for some background information.
(this example is for single supply)

Greetings,
Bertus

 

i suggest u use this schematic..... it works perfect i've used it abt 5 times..... and its the simplest.... works upto 100KHz if ur amplifier is a TL071 or TL072....

 

Hello,

What kind of distortion do you see ?
Is the sinewave clipped ?
Of so the feed back of the AGC is not correct.

Greetings,
Bertus

 

The THD is about 4-5 %, the sinewave is not cot by amplifier,maybe the problem is realy is AGC calculations, my Ugs was -0,6V.

 

Hello,

Perhaps you could try to replace R34 by a potentiometer of 25K.
You can measure the distortion with different settings and see what the optimum is.

Greetings,
Bertus