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Dave's Circuits
Circuits designed by David Johnson, P.E.

Master Category List - Dave's Circuits
Last Updated on: Friday, July 18, 2008 11:34 AM

Capacitance Switches    Fluid Level Monitor
Low Value Capacitance Meter
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

Low Value Capacitance Meter designed by David Johnson, P.E.

Capacitance Switches   Fluid Level Monitor

Master Schematic Category List - David A. Johnson, P.E.
 

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