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This circuit was originally designed to measure the volume of fluid inside a medical
syringe. As designed, it produces a zero to 5 volt output, corresponding
to a capacitance change of about 10 picofarads. With a digital voltmeter, at its
output, it can resolve a capacitance change of 0.002 picofarads or 2 femtofarads.
Click
on Drawing Below to view PDF version of Schematic
