So I have attached the picture of my circuit… It’s a current Feedback circuit, the resistance Rb is used to convert the current from the current transformer (0 to 10mA) to voltage, and that is passed through diode bridge and then through a low pass filter, and if I measure the voltage across the 0.47uF capacitor with an oscilloscope (Voltage V1 as shown in figure), the voltage seems to be good, it varies from 0 to approximately 4.8 V, which is what I want… but if I put an OP-AMP, and use it as a buffer amplifier, the output shows 6V and constantly increases… I know that there is something wrong with my circuit, I think the OP-AMP is trying to read the capacitor voltage and since the capacitor cannot discharge , the output of the OP-AMP is increasing… I tried connecting a resistor of 10K across the cap 0.47uF, it did not work. I tried everything, I almost spent like 20 hours on this circuit…
So I need help badly…
And I tried a voltage divider circuit in between OP-AMP and 0.47uF cap, and then tried to increase the gain of op-amp, the circuit actually worked, but I am getting a pure sawtooth waveform at Vout… I dont know whether I can give that to MCU analog pin…