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 automatically inverts the test leads connection according to the polarity of the...
This circuit was found in a publication from the 90s. The circuit can be assembled with modern...
This filter, from an audio publication from 1977, passes the frequency range corresponding to the...