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 small signal amplifier circuit was found in Motorola's 1969 documentation. The FET and the...
This is the conventional application of the UCN4202 to control a 12 V stepper motor with current...
Found in a manual of integrated circuits from the 90s, this circuit makes use of that time...