[dms-discuss] CD4017 Decade Counter IC - Anyone have one?

Bill King bking94618 at gmail.com
Mon Sep 8 20:01:27 UTC 2025


Hi All,
I have a project in mind and it needs a CD4017 decade counter IC.

They're cheap on Amazon and elsewhere, so cheap you don't buy just one
but 10-20. So maybe someone has a few lying around?

If you've read this far and are curious, here's the project.

I've just done an ebike conversion. It all works except that the hub
sends too many speed sensor pulses so the controller thinks you're
going 5-6X as fast as you're actually going. I don't care about the
speedometer being accurate, but this means the speed cutoff gets
activated way too soon.

So the plan is to get a decade counter and let it see N pulses (5, 6
whatever) before it sends a pulse as output. Returning the "speed" to
a usable value.

thanks,
Bill


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