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How can I set up the amplitude of a wien bridge oscillator made like this?

Let's suppose that the bottom resistances are (from top to bottom)

**R**,

_{1}**R**and

_{2}**R**.

_{3}We know that for oscillations to start and converge we need:

**R**(let's suppose 2.2)

_{1}/ R_{3}> 2**(R**(let's suppose 1.8)

_{1}|| R_{2}) / R_{3}< 2But how can I managed the amplitude?