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I am trying but in the various tests that I am trying I have seen that the cell that measures He, after a few minutes that is on becomes unstable, let me explain better there is no passage of helium but it begins to mark as there was helium (2 , 5%, 5% ec ..) with the potentiometer reset to 0%...

Hi everyone, I'm new to the forum, I found you because I was looking for a circuit to build just like this, I wanted to ask the author @MiyaruTe of this if you could put a more detailed list of the components you use, and then in another thing, I don't I am expert, it is possible to use a bigger...

I'm Lidiano, a diving instructor from Italy. Happy to join this community.