This conventional 4 channel circuit with the 4017 and 555 was found in the November 1991 Radio Electronics magazine. The potentiometer can be 47k and it controls the speed of the effect.
This precision circuit was suggested by General Electric in 1980s documentation. The circuit can be...
This circuit was obtained in a 1979 101 Electronics Projects. The circuit can be assembled easily,...
Originally, this circuit is from an English magazine, but I found it in Argentina's Radio Chassis...