This circuit was obtained from the February 1992 Radio Electronics magazine. In it, a bar of 4 LEDs flashes continuously at a speed given by C1 and the setting of R3.
This circuit was obtained from a 1965 magazine, but can still be assembled if we use a modern 6 V...
This circuit was found in the October 1993 Electronics Now magazine. The output transistors form...
This circuit was found in a former Popular Electronics. The timing is set on the potentiometer and the...