Venkadesh_M
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then you shd go for some low output offset opamp, still the output will more linear and not exactly linear...
I don't see a particular reason for "unstable" operation, except for 1N4007 leakage current.
Although I don't understand the specific conclusion, I think it's O.K. to make assumptions about likely and less likely reasons for unwanted circuit behaviour. The next step is to verify your assumptions. That's basically not difficult, but requires some measurements, e.g. with an oscilloscope. We can't do it from a distance.the leakage current of diode should be Negligible as it is connected to AC main
Although I don't understand the specific conclusion, I think it's O.K. to make assumptions about likely and less likely reasons for unwanted circuit behaviour. The next step is to verify your assumptions. That's basically not difficult, but requires some measurements, e.g. with an oscilloscope. We can't do it from a distance.
the scope shows ripples about 40mV p-p
What is the output for 500V (Amplitude) ???
Change the R3 by 22k (in #65) the ripples will disappear but the reaction time will increase some how...
for any case it would be 100ms so don worry about response time and slowly change the input and get readings. so this will work fine in real time..
post the current using circuit...
for 500V AC rms the input to controller is 1.9V but multimeter is not showing any variation in values but on oscilloscope the ripples are about 0.1V p-p
I hear some confusion in your statements. Any rectifier circuit has some ripple. If you calculate the expectable ripple for 470 ms averaging time constant, you'll get a ripple amount in the said range. In fact the circuit works as expectable.but it didnt work as there are ripples
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