This is one of the many possible siren configurations for the 555 integrated circuit. We found it in the October 1992 Radio Electronics magazine. It has a power stage.
Interval pulses emitted by this circuit are picked up in a medium wave radio nearby. The circuit is...
This oscillator takes advantage of the 2000 ohms headphone inductance as the oscillator circuit coil....
Originally this circuit was designed to operate with microcomputers from 1988, but it can be...