I need to measure AC RMS current using shunt resistor. AC current range is 0-8A RMS. Shunt resistor chosen is 100 mohm. which gives me max 8*1.414*10=1.13 Volt that i will use to feed an opamp to further amplify it to around max 3V with proper gain setting. and that will go to my micro controller ADC ( 0 to 3V only). Since in my circuit only positive supply is there so I used single supply op amp, (Negative half cycle will be chopped by opamp, i think). below is the ruff circuit.
which circuit out of below two looks ok to start.
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