This voltage sensor limits the discharge of a Nicad battery. We found it in an American documentation from 1968. Equivalent components can be used.
This circuit was obtained in an Electronics World of 1969. It is a crystal oscillator with a 100...
This circuit, shown in the figure, consists of a variable gain amplifier with differential input...
This circuit was found in the July 1992 Radio Electronics magazine. Sensitivity adjustment is made...