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.
This amplifier, obtained in an Argentinian publication of the 1970s, provides a 6 W output. The...
Found in Maxim's documentation from the 90's, this circuit uses an integrated from the time...
This circuit must be powered by a symmetrical source and has a very high input impedance. The...