Wien oscillator

116

02:11:19

Turn on by injecting noise (shaking the circuit).
The potentiometer adjust the amplifier gain, the theorical value to have stable oscillations is 2k (60%) but here it's about 2,03k. A hight gain will be unstable and produce square waves.

published 12 years ago

thebugger

12 years ago

It doesnt need to cut of the sine waves into square waves. Two zeners and a cap would fix it

hurz

12 years ago

Problem with these kind of oscillators is they have to have exactly a gain 1xloop attanuation. If it is little less its amplitude breaks down, if it is little to high it increases till saturation of opamps and produce harmonics, but its at least running. They are instable in amplitude. Now the point is to not hard limit against opamp limits, you have to find a way to limit as smoothly as possible to keep a good sinwave shape.

thebugger

12 years ago

Or you could just restore the cut off pulse by adding a simple passive filter. Or an active one.

steph22

12 years ago

Is it better ?

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