The detection is made with c1 and c2. It detects the what was known as ground balance in the old detectors. There is a simpler circuit on the web which just uses the op amp but this is still a good circuit and the cmos chip may give the circuit a good input impedance.
rgds
Apart from different scam "gravitation detecting artworks", here something from scientist real experiment:
Yeah, a lot of prejudice on many different levels on this forum. Prejudice and hatred blinds a person from the truth. This is where the lesson about "turning the other cheek" comes into play. Funny thing is those who need it the most have the hardest time learning the lesson and end up suffering the most.
Everything here on this forum uses some form of the frequency discriminator. Do people really forget that the early units did not use L-rods? I got deleted before for comparing the Head Ape from the movie "Planet of the Apes" with a skeptic. I'll risk getting this deleted by posting it again only this time I won't use any names. You know that is not far from the truth. The "humans" (greedy MFD money grabbers) destroyed themselves (the MFD industry) and then the apes took over and proclaimed themselves to be Holy. And in a way they were more Holy.
Like an old Eagles song "Certain Kind Of Fool"
It wasn't for the money
At least it didn't start that way
It wasn't for the running
But now he's running every day
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