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 using components that are still common in our market was found in a 1987...
This circuit is based on the well-known PLL 567 and can operate at 100 kHz. The transformer can be...
The simplest flip-flop can be built with two NAND gates as shown here. This is a Reset-Set [S-R]...