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.
The Buck-type DC-DC converter (voltage lowerer) shown in figure 11 is suggested by Analog Devices...
This circuit can be used to directly control direct current loads or higher alternating current loads...
This circuit can turn-on (only) a load (relay or lamp) when S1 is pressed. The circuit can be used as...