Active Filter (using op-amp) Solved Example | Quiz # 265

[@abhijithanilkumar4959]

Great sir
That's similar to a Wien Bridge oscillator

[@surendrakverma555]

Thanks Sir 👍

[@alexsyaneyniiko3417]

where did the j go?

[@allaboutelectronics-quiz]

at 3:23, only the magnitude of the transfer function is considered. Therefore, if you have a+jb then its magnitude will be sqrt (a^2 + b^2).
Similarly, here it is 1 / sqrt ( 1 + (wRC)^2).
I hope it will clear your doubt.