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 80's circuit, suggested in Texas Insrtruments documentation, uses a Hall effect sensor. The...
This traditional mixer configuration with a high input impedance was found in a 90’s Popular...
The sequence of logic levels applied to the inputs of and d1 determines the motor's movement. The...