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from the picture it seems the lower supply rail to br GND.
But from the diagram it seems the lower supply rail is at baout -30V.
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280uV @ 10kOhms = 28nA.
28nA @ 100nF gives a constant rate of I/C = 28nA / 100nF = 0.28V/s
-1/CR? I don't think so.