Wien bridge oscillator help...

[nlansley]

Sorry, I attached the wrong file, this is the revised circuit

 

[crutschow]

the total resistance with the Pot and the fixed resistor is the same as one single resistor however the output frequency is very different.

Are you measuring the resistance of the pot setting?

 

[Harald Kapp]

nlansley said:
the total resistance with the Pot and the fixed resistor is the same as one single resistor however the output frequency is very different.

That is a different circuit, not only a change in resistance.
This is how a change in resistance only would look like:

 

[Harald Kapp]

@crutschow : In another forum you posted LTSPICE simulation data for the 741 opamp. Unfortunately I cannot download as I'm not a member there. Would you care to post the two files here (or send them to me via PM)?

tia
Harald Kapp

 

[crutschow]

Would you care to post the two files here (or send them to me via PM)?

sure.
But since I can't download those files to this forum how can I PM them to you?