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 circuit is from a technical documentation from Texas Instruments from 1978. In it we have the...
We found this circuit in an old documentation, but it is still current, being able to feed sets of...
This circuit, found in a 1995 documentation, makes the relay bistable control from pulses of light...