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 provides 20 W of power on each channel, containing separate filters to power a...
This circuit of a few watts of power shows a typical configuration from the 70s using driver and...
We found this circuit in a 1980s Motorola documentation. The circuit makes use of common operating...