Found in an RF Design from the 90s, this circuit is based on components from the time. It can, however, be implemented with equivalent modern components.
This circuit is from a Radio Electronics magazine from July 1984. The transistor determines the...
This circuit was found at Electronics Now. It can be used as a shield detector for dial signals in an...
This circuit was obtained from an English circuit manual. Components are common and LEDs can be 3...