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Running LED

Running LED circuit using the inverted output signals of the CD4017 decade counter

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Six LED strip running back and forth

This circuit consists of a strip of six LED working through the inverted output signals of a CD4017 counter, so that you will see a dark light running back and forth.

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The first and the last LED are turned by the single outputs 0 and 5, so I just connected the base of a PNP transistor through a 12K resistor.

Each middle LED is switched by two outputs and gets dark when one of them takes the high level, so that the base of the transistor is bypassed by the low resistor.

The trimmer is supposed to set  the running speed of the circuit.

Adobe Portable Document Format - 101.01 kB - 07/13/2017 at 22:02

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richfiles wrote 07/24/2017 at 22:15 point

The CD4017 is a standard part in my stock parts bins. It's such a useful part! I've honestly used the 4017 more than I've used 555 timers! I most frequently use them in nixie tube clocks. Who needs a stinkin' micro when you have a clean time pulse and a series of counter dividers! :D

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