How to find the voltage gain of the amplifier (Vout/Vin)?
I wish to know this in terms of Resistance numbers...if possible.
Thanks and best regards, Vishal Sapre
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It's not exactly an amplifier - I reckon it's an attempt at a signal rectifier (half wave). But, ignoring the diode in the output, the gain of this non-inverting amplifier is 1 + Rf/Rx where Rf is the 10k feedback resistor and Rx is the parallel combination of R3 and R2.
For signal changes (i.e. gain analysis) the small offset produced by V1 thru R3 is null to the analysis.
Gain = 1 + 10k/(1k||220k) = 1 + 10/0.995475 = 1 + 10.04545
Note that R4 only comes into play when frequencies are very high and the non-inverting input capacitance starts to erode the input signal.