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photoplethysmography circuit schematic

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ohioo

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hi,
I'm doing a project about finding PPG.
i have to use 2 leds( ir and r) in my circuit to measure changes in the various depth of tissue. And it has to force a local changes in temperature ( regulate the flow of surface blood vessels) so I would like to ask if anyone get a PPG circuit design.
Thank you for the help and sorry for my english
 

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