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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">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.<o:p></o:p></span></p>
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<p class="MsoNormal"><b><span lang="EN-US" style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">From:</span></b><span lang="EN-US" style="font-size:10.0pt;font-family:"Tahoma","sans-serif""> Synth-diy [mailto:synth-diy-bounces@synth-diy.org]
<b>On Behalf Of </b>David G Dixon via Synth-diy<br>
<b>Sent:</b> 18 September 2021 05:08<br>
<b>To:</b> 'synth-diy mailing list'<br>
<b>Subject:</b> Re: [sdiy] Issue with CD4024 Ripple Counter<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">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.<o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal">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.<o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal">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.<o:p></o:p></p>
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<p class="MsoNormal" style="margin-bottom:12.0pt"><b><span lang="EN-US" style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">From:</span></b><span lang="EN-US" style="font-size:10.0pt;font-family:"Tahoma","sans-serif""> Pete Hartman [mailto:pete.hartman@gmail.com]
<br>
<b>Sent:</b> Friday, September 17, 2021 3:28 PM<br>
<b>To:</b> David G Dixon<br>
<b>Subject:</b> Re: [sdiy] Issue with CD4024 Ripple Counter</span><span lang="EN-US"><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:9.0pt;font-family:"Arial","sans-serif";color:black;background:#FFECB3">[<strong><span style="font-family:"Arial","sans-serif"">CAUTION:</span></strong> Non-UBC Email]</span><o:p></o:p></p>
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<p class="MsoNormal" style="margin-bottom:12.0pt">he wasn't saying you were a noob. :)<br>
<br>
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.<br>
<br>
I do think fishing a couple out to send to someone to grind down and check would be an interesting exercise.<br>
<br>
<o:p></o:p></p>
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<p class="MsoNormal">On Fri, Sep 17, 2021 at 3:28 PM David G Dixon via Synth-diy <<a href="mailto:synth-diy@synth-diy.org">synth-diy@synth-diy.org</a>> wrote:<o:p></o:p></p>
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<p class="MsoNormal">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).<o:p></o:p></p>
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<p class="MsoNormal" style="margin-bottom:12.0pt"><b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">From:</span></b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif""> 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</span><o:p></o:p></p>
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<p class="MsoNormal"><span style="font-size:9.0pt;font-family:"Arial","sans-serif";color:black;background:#FFECB3">[<strong><span style="font-family:"Arial","sans-serif"">CAUTION:</span></strong> Non-UBC Email]</span><o:p></o:p></p>
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<p class="MsoNormal">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. <o:p></o:p></p>
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<p class="MsoNormal">bbob drake<o:p></o:p></p>
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<p class="MsoNormal">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:<o:p></o:p></p>
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<p class="MsoNormal">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>
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