[sdiy] Issue with CD4024 Ripple Counter

Michael E Caloroso mec.forumreader at gmail.com
Sat Sep 18 17:20:52 CEST 2021


Particular need for CD series is when you need very small power supply
current demand during non-switching states.

MC

On Sat, Sep 18, 2021 at 7:41 AM Tom Wiltshire <tom at electricdruid.net> wrote:

> Mike’s seems like a good point. Is there any particular need to use the CD
> series? Do you really need 15V logic?
>
> On 18 Sep 2021, at 11:13, Mike Bryant <mbryant at futurehorizons.com> wrote:
>
> Personally I wrote off all CD4xxx ICs a long time ago.  You can get
> special 74HC devices with high voltage outputs for the few times you need
> to drive >5V, and these will always be newer faster, lower power designs
> with better input and output protection.
>
>
>
> *From:* Synth-diy [mailto:synth-diy-bounces at synth-diy.org
> <synth-diy-bounces at synth-diy.org>] *On Behalf Of *David G Dixon via
> Synth-diy
> *Sent:* 18 September 2021 05:08
> *To:* 'synth-diy mailing list'
> *Subject:* Re: [sdiy] Issue with CD4024 Ripple Counter
>
> Well, I wasn't writing off all CD4XXX chips.  Just the ones with
> edge-sensitive clocks.  The ones that just respond to logic levels never go
> wrong.
>
> The thing is, I'm developing a product for sale -- another one of my
> Sketchy Labs modules -- so it's important that I can rely on the chips I
> ultimately choose.  At this point, I would never sell a module with a
> CD4024 in it.
>
> Also, just to be clear, I had four CD4024s, but they were from two very
> different batches.  They had different looks.  Two had a gold stripe on one
> end, and the others just had plain white lettering.  All seemed bad.
>
> ------------------------------
>
> *From:* Pete Hartman [mailto:pete.hartman at gmail.com
> <pete.hartman at gmail.com>]
> *Sent:* Friday, September 17, 2021 3:28 PM
> *To:* David G Dixon
> *Subject:* Re: [sdiy] Issue with CD4024 Ripple Counter
> [*CAUTION:* Non-UBC Email]
>
> he wasn't saying you were a noob. :)
>
> He's saying writing off the entire CD4XXX series of chips (with prejudice)
> because it sounds like you got a bad batch is going to be alarming to those
> around here who are noobs.
>
> I do think fishing a couple out to send to someone to grind down and check
> would be an interesting exercise.
>
>
> On Fri, Sep 17, 2021 at 3:28 PM David G Dixon via Synth-diy <
> synth-diy at synth-diy.org> wrote:
>
> I'm tempted to dig those shitty chips out of the trash and mail them to
> you, to see if you fare any better, given that I'm such a noob (with 13
> years of experience designing millions of dollars worth of successful synth
> modules).
>
>
> ------------------------------
>
> *From:* bbob [mailto:fluxmonk at gmail.com]
> *Sent:* Friday, September 17, 2021 12:10 PM
> *To:* David G Dixon
> *Cc:* synth-diy mailing list
> *Subject:* Re: [sdiy] Issue with CD4024 Ripple Counter
> [*CAUTION:* Non-UBC Email]
> 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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