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.
Found in a Popular Elecronics from the 90s, this circuit appears in other versions in this section and...
Using an operational amplifier at the time, this circuit was found in documentation from the...
Here we have a circuit suggested by Texas lnstruments that consists of a receiving stage that has...