I am looking for an isolated method of measuring mains voltage (230VAC).

First thoughts are a Opto coupler running in its linear region ?
My concerns are that the transfer ratio degrades over time.

The circuit needs to provide a fairly linear response from 150VAC to 270VAC.
The output required for the Micro is 0-2.5V.

Any ideas for existing circuits much appreciated

Thanks in advance

Regards

David


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