This circuit was found in the December 1977 issue of Radio Electronics magazine. The 4-digit circuit is based on TTL logic and must be powered by a voltage of 5 V.
This control from a 1989 publication can be assembled with several equivalent components. The SCR,...
In the figure we have a circuit suggested by National Semiconductor, using an operational...
This circuit was obtained from an English magazine from 1976. What this circuit does is start from...