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.
Found in an Elektor from the 90s, this circuit is based on components that are still common today....
Used in audio circuits in the excitation of output stages, this circuit provides audio signals with...
This circuit is from a manual from the 80's and the operational one used, uncommon nowadays, can...