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How to set reference for a sine wave with dc supply
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exe:

--- Quote from: anishkgt on June 30, 2018, 09:26:03 am ---
--- Quote ---I was thinking of connecting the Neutral to the common GND as the opamp does. Should i do that ?
--- End quote ---
Nope that did not work either. no voltage at all.

--- End quote ---

Yes, GND and neutral must be connected. That's because for electric current to flow there must be a return path.

Concerning your circuit. If it still doesn't work after all suggestions, then there is a mistake in wiring or something. I suggest start from scratch and add "building blocks" one by one: diode, resistor divider, zener clamp, opamp, and output circuitry. Strictly in this order checking with the oscilloscope the circuit works the way it should. Otherwise troubleshooting may take forever.
anishkgt:
Thank you for your time.

I think i would go with the optocoupler idea and see how that goes.
anishkgt:

--- Quote from: anishkgt on June 30, 2018, 08:10:42 pm ---Would it be like a crowbar between the optocoupler ?
--- End quote ---



Something like this ?
anishkgt:
if i understand it correctly

Note: Replaced attachment.
anishkgt:
Scope view at the secondary.
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