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integrant2
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This is finger plethysmograph i found on Cornell site. I can kind of understand how the circuit works, but i am confused on the circuitry around the op amps, especially the 10K potentiometer, i have no idea what that does.
My guess is 10uf cap and 20K ohm is a high pass filter and a low pass filter (the 100K ohm and .47uf cap) is fed back to the inverting input for amplification. Please correct me if i am wrong.
Any help is greatly appreciated.