We found this circuit in the Radio Electronics magazine of May 1977. The circuit has the frequency given by the components according to the formula next to the diagram.
Common operational amplifiers can be used on this circuit. The resistor with no value in series with...
The purpose of this circuit is to detect the movement of a person by the changes in light that...
Found in an Analog Devices documentation from the 90s, this circuit uses a component of the time,...