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Strange behavior - simulated op-amp rectifier

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FriedMule:
Hi

I have, as I mostly do, searched and found some article and a schematic that should be great.
According to the article, this rectifier should be a wary precise full wave version with nearly no loss.
But when I simulate it, it do only rectify the positive AC and on top of that, do it deliver a -2.3V to 9.75V voltage.

Info: input 10V 50Hz

unitedatoms:
https://en.wikipedia.org/wiki/Precision_rectifier

I did not look into details, but it looks like the rectifier is working as half wave one. It is intended by design.

fcb:
Your circuit consists of two elements.

1. Precision halfwave rectifier (R1/R2/D1/D2/IC1)
2. Halfwave to fullwave converter (R3/R4/R5/IC2)

Split the circuit and test part 1, first without a load - suspect you'll find that R3's virtual earth load on the precision rectifier is the problem, you might need to put a x1 buffer in between D1 and R3.

FriedMule:

--- Quote from: unitedatoms on January 01, 2020, 03:43:23 pm ---https://en.wikipedia.org/wiki/Precision_rectifier

I did not look into details, but it looks like the rectifier is working as half wave one. It is intended by design.

--- End quote ---
Thanks for the link. No according to the schematic, the original one on the top most image, it says "full wave rectifier"

FriedMule:

--- Quote from: fcb on January 01, 2020, 04:03:05 pm ---Your circuit consists of two elements.

1. Precision halfwave rectifier (R1/R2/D1/D2/IC1)
2. Halfwave to fullwave converter (R3/R4/R5/IC2)

Split the circuit and test part 1, first without a load - suspect you'll find that R3's virtual earth load on the precision rectifier is the problem, you might need to put a x1 buffer in between D1 and R3.

--- End quote ---
Thanks I'll try that now:-)

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