This circuit is from a National Semiconductor manual from the 1980s. The integrated circuit is rare today and next to the diagram we have the formula for calculating the components.
This circuit, which may have other applications, trips a load if the voltage on the telephone line...
This UHV generator circuit or ultra-high voltage was found in a 90s Electronic Engineering 90s. The triac...
This circuit is from an old American documentation from the 70s. Transistor 2N3904 can be replaced by...