[sdiy] Issue with CD4024 Ripple Counter

bbob fluxmonk at gmail.com
Fri Sep 17 21:10:13 CEST 2021

lots of designers have used CD4000 series CMOS in SDIY circuits
successfully.  they have their place if used properly, and their
limitations (like every technology).  would be a shame if a newcomer were
to be scared off of perfectly good parts just because you couldn't get it
to work in your application.

bbob drake

On Fri, Sep 17, 2021 at 2:52 PM David G Dixon via Synth-diy <
synth-diy at synth-diy.org> wrote:

> So, I went to the lab and set up a little breadboard.  I put 4024 on it,
> used my +15V and 0V rails to power it (yes, I decoupled with 104), and I
> also set up a TL072 as a comparator driven by a triangle-wave LFO.  I sent
> the output of the comparator through a diode to have it go just between 0V
> and +15V.  I tried clocking two CD4024BEs, two CD4024BCNs, and one
> MC14024BCP.  The CD4024BCNs didn't even work.  The CD4024BEs gave me some
> really hashy looking outputs.  The MC14024BCP worked perfectly.  Then I
> tested them in an ASR, with similar results.
> So, I threw all of the CD4024s into the trash.  Unfortunately, I only have
> one MC14024B.  I'm going to buy more, cuz they work well, without any
> issues.
> Lesson learned, I guess.  I'm just not sure what the lesson is, other than
> "don't use CD4XXX chips" or at least ones with edge-driven inputs.
> Argghh!!!  Why can't this stuff just work?  It's a miracle that we aren't
> still living in caves, wearing skins and hunting sabre-tooth tigers with
> sticks.
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