Unable to get a Wien bridge oscillator to work

  • #26
Baluncore
Science Advisor
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I think I am using the negative terminal as ground.
Then it cannot work, because the op-amp sinewave output cannot go outside the supply voltage, that is below B-.

You will need to build the left hand side of the circuit I posted. That will provide the common ground voltage for the oscillator. The oscillator output can then move between common – 1 volt and common + 1 volt.
 
  • #27
LvW
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Each resistor is 1000 ohms. First each capacitor was 120 microfarad. Then I tried switching capacitors. Then I tried 100 nanofarad capacitors.
Is it really a problem for you to show us the complete circuit with power supply and parts values?
Are you aware that the most critical part is - as far as the oscillation capability is concerned - the gain of the opamp (hence the feedback resistors), which is still unknown!!
 
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