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 traditional configuration of astable was found in a 1965 documentation. Transistors can be...
This variable frequency oscillator generates signals that have a recurrence frequency determined by...
This is an old circuit, using operating equipment of the time, modern operational amplifiers can...