Wein bridge oscillator stimulation

[Bhimsen Budhathoki]

Hi people,
I have an assignment to design and stimulate a wein bridge oscillator which oscillates at 37 kHz in multisim. I am very much sure my calculations are correct. But still I am not getting a sinusoid at the output. Here is my circuit diagram.

I would be really grateful if someone would point out mistake

 

[FvM]

- Oscillation frequency is 3.7 not 37 kHz
- Inverting feedback path must be setup for a gain > 3, not = 3
- "Kick start" or nonzero initial condition required in simulation to start oscilllations
- uA741C has maximum supply voltage of +/- 18V

 

[_Eduardo_]

R4 = 2R3 is the limit where oscillation occurs, should be slightly larger --> try R4 = 21k

 

[LvW]

Another comment: If you really want 37 kHz the use of a 741 type amplifier is rather "problematic" becaus the large signal bandwidth is about 10 kHz.
You will observe slew rate limitations. Recommendation: use another opamp.
(This comment does not apply for an oscillation frequecy of 3.7 kHz)