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How to remove HPF from a Photo transistor circuit?

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DonBradman

Thread Starter

DonBradman

Joined Mar 30, 2023
40
ericgibbs said:
Hi Don,
Please confirm my assumption on the details of this project, as per post #18? :)

The last plots I posted were from a human heart beat recording.

E
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which assumptions are left? In post 12 you ask whether I hv an example of the waveform but I currently don't. The waveform in your wav file looks slightly different (it has two significant bulges with each heart beat as I believe it has been recorded in two light spectrums. other than that its fine and looks the same as a person's should. I am experimenting on my own finger.
 
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