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The CD4017 IC is a decade counter that counts to ten. It has 10 outputs that represent the numbers 0 to 9. The counter increases with one for every rising clock pulse. After the counter has reached 9, it starts again from 0 with the next clock pulse.

This is a great chip for making running LEDs!



1. CD4017 – A Decade Counter with Decoded Output

2. CD4017 Circuits


CD4017BE – Counter IC

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