Half-wave rectifier opamp in single supply

From: MRW <mr.whatever@xxxxxxxxx>
Date: Fri, 22 Jun 2007 20:27:09 -0000

Good day! I have the following circuit:
http://www.bayimg.com/NabJOAABE

Just looking at the configuration on paper, the voltage at R18's
terminal next to D2 would have given me V2 if Vin < V2. I'm not quite
sure why my spice simulation is showing 1.683V.

Any insights? Thanks!

.

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