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 a QST from the 90's this circuit is suitable for the medium and short-wave range. |...
The circuit shown in figure 1 consists of an Inverter Module for CCFL Lamp that can be supplied with...
This circuit is based on the voltage reference that is uncommon today MC1403. Equivalents can be...