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.
We found this circuit in a 1975 publication. The power supply must be symmetrical, but other...
This circuit is from 1977 documentation, and high current equivalent transistor must be used. The...
Although indicated in the original publication of the 1980s as a capacitance switch, the circuit...