I tried to simulate a Wien-Bridge-Oscillator with Protel 2004, but the output seems to be strongly attenuated (see attachment). Who can help me solving this problem?
Good.
Then it should oscillate if the closed loop gain of the opamp is more than 3.00.
The calculated gain is only 3.008 minus a loss because the opamp's open loop gain is not infinite, so try reducing the 498 ohm resistor to 470 or 430 ohms for a little more gain.
I would say that the oscillation doesn't start! If you want to see the sine wave with the simulator, try to add a pulse generator with a 10M ohms resistance in series to the non inverting input. After the pulse, the oscillation will sustain itself.
I tried to simulate a Wien-Bridge-Oscillator with Protel 2004, but the output seems to be strongly attenuated (see attachment). Who can help me solving this problem?
Sometimes you need to specify an initial condition in the simulator to get the oscillation "kick-started." You might want to try an .ic of a couple volts on the output node.
Sometimes you need to specify an initial condition in the simulator to get the oscillation "kick-started." You might want to try an .ic of a couple volts on the output node.