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I'm saying no DC coupling from the photodiode. You need AC coupling, and it's a point to rolloff LF hash like from streetlights.

[ATTACH=full]198390[/ATTACH]

Like this high gain discrete photo-amp for 38kHz. Also notice the diode-clamp prevents the amp from being overloaded with the associated recovery time if the carrier signal is too strong.
With you using the op-amp, it might not be possible to prevent the first stage from being saturated, which is why the gain/filtering is broken up over many stages.
It's a very difficult design, what you are doing actually.

[QUOTE="prairiedog, post: 1790661, member: 594824"] I'm saying no DC coupling from the photodiode. You need AC coupling, and it's a point to rolloff LF hash like from streetlights. [ATTACH type="full"]198390[/ATTACH] Like this high gain discrete photo-amp for 38kHz. Also notice the diode-clamp prevents the amp from being overloaded with the associated recovery time if the carrier signal is too strong. With you using the op-amp, it might not be possible to prevent the first stage from being saturated, which is why the gain/filtering is broken up over many stages. It's a very difficult design, what you are doing actually. [/QUOTE]

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