This circuit was found in the April 1973 issue of Radio Electronics magazine. Using TTL technology, it was recommended for vehicles of the time. The circuit was connected to the contact breaker.
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...