In the above circuit during positive half cycle U1A act as a voltage follower and U1B act as a buffer and diode D2 is forward biased during that the diode has a voltage drop of 0.62V in datsheet there is a equation like Vout = Vin what happens to the drop and during negative half cycle the D1 conduct the R1 also has some drop what is the output of U1B i also want to know what is the use of R4 and C7
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