Using a capacitor as a sensor, this circuit was found in the 1989 Radio Electronics Experimenter magazine. The circuit must be assembled in a shielded box.
This circuit was obtained from a 1966 General Electric documentation. It can serve as a basis for...
This circuit was found in Siliconix documentation from the 1980s. Equivalent operational...
Obtained from a 1980s Linear Technology documentation, this circuit has a hysteresis of less than...