Hello,
I am making a Wien Bridge Oscillator, however, I have a few problems:
1) One uniqueness of Wien Oscillator is that it has no energy source: Since the energy source comes from capacitor, the sine wave can't be maintained permanently, meaning we have to charge the capacitors everytime they are fully discharged, how to overcome this?
2)Since f=1/2piRC => frequency depends on R and C, how to select appropriate R,C to get my desirable frequency, lets say 20kHz?
3) There can be resistors connected to inverting input (-) of an op-amp in Wien Oscillator, what are their function? Since frequency is determined by R,C at non-inverting input, so why are there resistors at the inverting input? How and why to determine their values? And sometimes there can be diodes and 3/4 resistors at the inverting input, in this case, how to determine their values again?
4) How to control the peak amplitude of the sine wave? Lets say the wave oscillates between -5V and +5V.
Thanks a lot !!! I really appreciate your help.
I am making a Wien Bridge Oscillator, however, I have a few problems:
1) One uniqueness of Wien Oscillator is that it has no energy source: Since the energy source comes from capacitor, the sine wave can't be maintained permanently, meaning we have to charge the capacitors everytime they are fully discharged, how to overcome this?
2)Since f=1/2piRC => frequency depends on R and C, how to select appropriate R,C to get my desirable frequency, lets say 20kHz?
3) There can be resistors connected to inverting input (-) of an op-amp in Wien Oscillator, what are their function? Since frequency is determined by R,C at non-inverting input, so why are there resistors at the inverting input? How and why to determine their values? And sometimes there can be diodes and 3/4 resistors at the inverting input, in this case, how to determine their values again?
4) How to control the peak amplitude of the sine wave? Lets say the wave oscillates between -5V and +5V.
Thanks a lot !!! I really appreciate your help.