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.
Three of the four gates found in a 4001 can be used to perform as an AND gate. This improvisation...
This circuit was taken from the 1960's Mullard Transistor Manual. Information about the coils is...
This circuit from July 1975 Radio Electronics uses any operating system with a symmetrical source....