Steven J GreenfieldI have redrawn the schematic so it is more clear. I also drew up a block diagram with waveforms and explanation of circuit operation.
I welcome questions and comments.
Clearer schematic and block diagram added
A project log for Dual TLC555 Capacitance Meter 0.1pF Resolution
Two 555 timers turn capacitance into an analog voltage readable on a DMM. With a modern 600.00mV scale, that is readable to 10femtofarad.
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