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 was obtained from a 1985 Electronic Desing. The circuit uses a Darlington which may be...
This circuit is from a 1978 magazine Radio & Electronics Constructor, but it can be assembled with...
This humidity sensor indicates the different levels of conduction of the sensors through an LED...