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 Electronics now from the 90s, this circuit uses a sensor from the time, which is...
We find this circuit in a 1978 documentation. The circuit uses two inverters of a 4049 integrated...
In the figure we have an interface using an optical coupler and the comparator LM339 or any...