Follow along with the video below to see how to install our site as a web app on your home screen.
Note: This feature may not be available in some browsers.
I explained that when your resistor value is low then your capacitor value must be high to produce a low frequency.what the problem with this low value ?
Then both of the "R" resistors must be 330k ohms for the low frequency you want.
The input resistance of the TL074 opamp is provided with junction field-effect transistors. The datasheet says the resistance is ten TRILLION ohms. A trillion is one thousand times one billion.Is TL074 op-amp has an extremely high or low input resistance ???
I do not know what you did and I do not know why you changed the circuit. Please post your latest schematic.I know it is low, so that I put a voltage divider at the op-amp output for amplitude control with a double variable resistance, and it will be the input with triangular oscillation on Lm311 ,thus I have a pwm circuit.
If you reduce the value of both of the "R" resistors and add a dual gang pot then this pot can change the frequency. The diodes keep the amplitude constant.if I control on frequency using R,R it effect on the amplitude and change it.
No.i used wien bridge oscillator same as the figure in post #2...
Since the output amplitude drops as you increase the values of R and R then pspice does not know how a Wien Bridge oscillator is supposed to work.there is no load ...
i just simulate the circuit using pspice and not apply it yet
this is my circuit
I want a sin-wave oscillator , when I can control frequency between 5-50 Hz and control amplitude between 1-10 volt ...
the important thing the frequency and amplitude are independent....condition (*)
so if I've change the frequency , the amplitude shouldn't be changed .
i used wien bridge oscillator same as the figure , but the condition (*) didn't done
The output level of the triangle wave is calculated during the design of the oscillator.so I can't get a determined value of output ?