This circuit was obtained from an American documentation from the 90's. Inductors are critical components of the circuit. The output is 120 V sinusoidal.
Because it uses TTL integrated circuits, this siren must be powered by 5 V or as indicated with D1 to...
The correct connection of speakers and tweeters in a speaker to obtain better sound quality,...
The CMOS PLL used on this circuit is not very common. The circuit can be used to take out contact...