This circuit with TTL integrated circuits was found in the December 1987 issue of Radio Electronics magazine. The circuit uses a LED scale and is suitable for gaming applications.
Two inverters, of the 6 available in a Low-power Schottky 74LS04, are used in this anti-ring...
The purpose of this circuit is to alternately activate a two-tone horn with low sound and a horn...
This circuit was obtained in an old French publication from the 80s. The maximum power of the lamp...