<div dir="ltr">How old are these chips (the MC14xxx as well as the CA)? When did you buy them and from whom? Who's the manufacturer and what's the datecode?<br><br>It's conceivable chips could go bad over several decades, either the processes weren't that great or the encapsulation wasn't good enough. I've also heard of electron migration, but that only happens while a chip is powered up, and wouldn't apply to new or NOS chips.<br><br>I'm looking at the TI datasheet, and it's scanned (!):<br><a href="https://www.ti.com/lit/ds/symlink/cd4024b.pdf">https://www.ti.com/lit/ds/symlink/cd4024b.pdf</a><br>It does have some non-scanned text: "
Data sheet acquired from Harris Semiconductor"<br>So did Harris buy RCA's CMOS line, then TI got it from Harris?<br><br>I see this as a point of frustration, but enquiring minds want to know what happened.<br><br></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Fri, Sep 17, 2021 at 4:27 PM David G Dixon via Synth-diy <<a href="mailto:synth-diy@synth-diy.org">synth-diy@synth-diy.org</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><u></u>
<div>
<div dir="ltr" align="left"><span>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).</span></div>
<div dir="ltr" align="left"><span></span> </div>
<div dir="ltr" align="left"><span> </span></div>
<div dir="ltr" align="left">
<hr>
</div>
<div dir="ltr" align="left"><font size="2" face="Tahoma"><b>From:</b> bbob
[mailto:<a href="mailto:fluxmonk@gmail.com" target="_blank">fluxmonk@gmail.com</a>] <br><b>Sent:</b> Friday, September 17, 2021 12:10
PM<br><b>To:</b> David G Dixon<br><b>Cc:</b> synth-diy mailing
list<br><b>Subject:</b> Re: [sdiy] Issue with CD4024 Ripple
Counter<br></font><br></div>
<div></div>
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Non-UBC Email]</font></td></tr></tbody></table>
<div dir="ltr">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.
<div><br></div>
<div>bbob drake</div></div><br>
<div class="gmail_quote">
<div dir="ltr" class="gmail_attr">On Fri, Sep 17, 2021 at 2:52 PM David G Dixon via
Synth-diy <<a href="mailto:synth-diy@synth-diy.org" target="_blank">synth-diy@synth-diy.org</a>>
wrote:<br></div>
<blockquote style="border-left:1px solid rgb(204,204,204);margin:0px 0px 0px 0.8ex;padding-left:1ex" class="gmail_quote">So, I went to the lab and set up a little breadboard.
I put 4024 on it,<br>used my +15V and 0V rails to power it (yes, I decoupled
with 104), and I<br>also set up a TL072 as a comparator driven by a
triangle-wave LFO. I sent<br>the output of the comparator through a
diode to have it go just between 0V<br>and +15V. I tried clocking two
CD4024BEs, two CD4024BCNs, and one<br>MC14024BCP. The CD4024BCNs didn't
even work. The CD4024BEs gave me some<br>really hashy looking
outputs. The MC14024BCP worked perfectly. Then I<br>tested them in
an ASR, with similar results.<br><br>So, I threw all of the CD4024s into the
trash. Unfortunately, I only have<br>one MC14024B. I'm going to
buy more, cuz they work well, without any<br>issues.<br><br>Lesson learned, I
guess. I'm just not sure what the lesson is, other than<br>"don't use
CD4XXX chips" or at least ones with edge-driven inputs.<br>Argghh!!! Why
can't this stuff just work? It's a miracle that we aren't<br>still
living in caves, wearing skins and hunting sabre-tooth tigers
with<br>sticks.<br><br>_______________________________________________<br>Synth-diy
mailing list<br><a href="mailto:Synth-diy@synth-diy.org" target="_blank">Synth-diy@synth-diy.org</a><br><a href="http://synth-diy.org/mailman/listinfo/synth-diy" rel="noreferrer" target="_blank">http://synth-diy.org/mailman/listinfo/synth-diy</a><br>Selling
or trading? Use <a href="mailto:marketplace@synth-diy.org" target="_blank">marketplace@synth-diy.org</a><br></blockquote></div></div>
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