This circuit was obtained from the Encyclopedia of Electronic Circuits volume 5 of 1995. The circuit uses the 4001 CMOS to obtain hysteresis in the sensor feedback.
This conventional circuit with a source adjustable to 1.5 A was obtained in a documentation...
With this circuit it is possible to compare the values of two capacitors in the range of 100pF to...
We found this configuration in a French documentation from the 70s. It appears sometimes in this...