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 circuit, published in the 1980s, can be applied to operational amplifiers of almost any type....
Found in a 1969 Electronics World, this circuit generates low frequency signals with two...
This circuit was found in a 1980s documentation for amateur radio. The circuit is for 9 MHz...