I've connected the circuit of Fig 3.4.6 in this link which is shown below:
Here is the circuit that I've connected:
Where in my circuit:
- R3 = 100 kOhm
- R4 = 47 kOhm
- R1 = R2 = 5.1 kOhm
- C1 = C2 = 100 nF
- Op amp is of type 741
- Diodes are of type 1N4001
I chose R3 and R4 based on this circuit from here:
This circuit is the same as the one in the first figure except that there are no diodes.
When I connected the output of the circuit to an oscilloscope, here is all what I could see:
I tried connecting a potentiometer in place of R4 and varying its value but with no noticeable changes in the output.
Note: I've simulated my circuit using Multisim but using different diode types (1N4148), and the results were good.
How can I get the circuit to operate properly?