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Wien Bridge oscillator

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Taskuraha

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I am design wien bridge oscillator for f=1khz and 1Vp amplitude ( +-10V Vcc ). When calculating limiting circuit resistanses ( chosen R5=R4=1kΩ ) i get negative value for R6=R3 . I assumed that D2 conducts when Vd2 = 0.7v ( Vb=0.7V+V1). Positive peak of Vo i have limited using equation Vb=V×R5÷(R5+R6) + Vo×R6÷(R5+R6) , where V is operating voltage. Where do i make a mistake?

Circuit which i am using is :
 

may i suggest this ... the limiting voltage here is 5 Volt
 

A negative value for resistance is not necessarily wrong.
 

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