Need help with identifying the topology of this Amplifier Circuit

Ian0

Joined Aug 7, 2020
7,441
My guess is that it gives a 50Hz sinewave centred on 1.5V, from a 12V transformer, for the purpose of measuring the mains voltage using a 3.3V micro controller.
but it does need a 3.3V supply op-amp, not a OP292.
 
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