I'm trying to rectify and amplify an AC signal.
I came up with this schematic.
I'll probably be using LM358. I noticed the datasheet (TI) specifies that I shouldn't drive the inputs negative by more than 0.3v (See note 3).
Therefore I added a diode (D4) to clip the negative cycle (I'd use either a Germanium or a Schottky diode -for low Vf).
Now that the input is clipped, is the diode in the feedback loop (D3) really necessary ?