Although the output doesn’t seem to oscillate now.

Sometimes in simulations, you have to add a perturbation to get an oscillator to start.
You can use the .uic command to avoid the initial bias calculation which can leave it in a non-oscillating state, or add a small current generator pulse into the feedback loop.

 

Hi,

I need help creating a 1Hz oscillator using an op amp and passive components, I’ve been trying but can’t get the theory to match the simulations.
Thanks.

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Does it have to be sinusoidal? If you can get away with a pulse or square wave then make a divider and divide your 120Vac line frequency by 60. Build an RC front end to drive a photocoupler like an NEC2502-1 outputting a 60Hz square wave. Then use your choice of digital divider (TTL, CMOS, etc...) to divide by 60. Produces a very stable and rather accurate 1Hz output.

 

Hi everyone, thanks for all the advice.

I have managed to create a circuit now using a OPAMP 741 Multivibrator Circuit with oscillation frequency of 1Hz.

Thanks again.

 

Google shows a very simple opamp multivibrator circuit that produces a squarewave output, not a sinewave:

 

Google shows a very simple opamp multivibrator circuit that produces a squarewave output, not a sinewave:

That would be my choice. Not going to get a sine wave out of a Wein Bridge osciullator without a well designed AGC. Was just going to suggest it.