This sequential circuit appears in other versions on this site. This is from American documentation from the 1960s. The speed of the effect is set to R1.
It serves as a reference, since today we can have simpler and more compact solutions. This circuit is...
This circuit is from an old manual from National Semiconductor (Now Texas), using the LM2877 not...
This circuit is from the Motorola Linear Databook published in 1990. The circuit for 1 kHz can be...