This switched-mode circuit was found in the April 1976 issue of Radio Electronics magazine. The circuit has low current and is suitable for 6 V digital applications.
This circuit is given in two versions, having been found in a publication from the 90s. The second...
This circuit was found in an ancient American documentation. Used integrated circuits are uncommon...
This Texas Instruments circuit uses a phototransistor to fire a TTL trigger port. Other...