<html><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;" class="">Mike’s seems like a good point. Is there any particular need to use the CD series? Do you really need 15V logic?
<div><br class=""><blockquote type="cite" class=""><div class="">On 18 Sep 2021, at 11:13, Mike Bryant <<a href="mailto:mbryant@futurehorizons.com" class="">mbryant@futurehorizons.com</a>> wrote:</div><br class="Apple-interchange-newline"><div class=""><div class="WordSection1" style="page: WordSection1; caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none;"><div style="margin: 0cm 0cm 0.0001pt; font-size: 12pt; font-family: "Times New Roman", serif;" class=""><span style="font-size: 11pt; font-family: Calibri, sans-serif; color: rgb(31, 73, 125);" class="">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 class=""></o:p></span></div><div style="margin: 0cm 0cm 0.0001pt; font-size: 12pt; font-family: "Times New Roman", serif;" class=""><span style="font-size: 11pt; font-family: Calibri, sans-serif; color: rgb(31, 73, 125);" class=""><o:p class=""> </o:p></span></div><div style="margin: 0cm 0cm 0.0001pt; font-size: 12pt; font-family: "Times New Roman", serif;" class=""><span style="font-size: 11pt; font-family: Calibri, sans-serif; color: rgb(31, 73, 125);" class=""><o:p class=""> </o:p></span></div><div style="margin: 0cm 0cm 0.0001pt; font-size: 12pt; font-family: "Times New Roman", serif;" class=""><span style="font-size: 11pt; font-family: Calibri, sans-serif; color: rgb(31, 73, 125);" class=""><o:p class=""> </o:p></span></div><div class=""><div style="border-style: solid none none; border-top-width: 1pt; border-top-color: rgb(181, 196, 223); padding: 3pt 0cm 0cm;" class=""><div style="margin: 0cm 0cm 0.0001pt; font-size: 12pt; font-family: "Times New Roman", serif;" class=""><b class=""><span lang="EN-US" style="font-size: 10pt; font-family: Tahoma, sans-serif;" class="">From:</span></b><span lang="EN-US" style="font-size: 10pt; font-family: Tahoma, sans-serif;" class=""><span class="Apple-converted-space"> </span>Synth-diy [<a href="mailto:synth-diy-bounces@synth-diy.org" class="">mailto:synth-diy-bounces@synth-diy.org</a>]<span class="Apple-converted-space"> </span><b class="">On Behalf Of<span class="Apple-converted-space"> </span></b>David G Dixon via Synth-diy<br class=""><b class="">Sent:</b><span class="Apple-converted-space"> </span>18 September 2021 05:08<br class=""><b class="">To:</b><span class="Apple-converted-space"> </span>'synth-diy mailing list'<br class=""><b class="">Subject:</b><span class="Apple-converted-space"> </span>Re: [sdiy] Issue with CD4024 Ripple Counter<o:p class=""></o:p></span></div></div></div><div style="margin: 0cm 0cm 0.0001pt; font-size: 12pt; font-family: "Times New Roman", serif;" class=""><o:p class=""> </o:p></div><div style="margin: 0cm 0cm 0.0001pt; font-size: 12pt; font-family: "Times New Roman", serif;" class="">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 class=""></o:p></div><div style="margin: 0cm 0cm 0.0001pt; font-size: 12pt; font-family: "Times New Roman", serif;" class=""> <o:p class=""></o:p></div><div style="margin: 0cm 0cm 0.0001pt; font-size: 12pt; font-family: "Times New Roman", serif;" class="">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 class=""></o:p></div><div style="margin: 0cm 0cm 0.0001pt; font-size: 12pt; font-family: "Times New Roman", serif;" class=""> <o:p class=""></o:p></div><div style="margin: 0cm 0cm 0.0001pt; font-size: 12pt; font-family: "Times New Roman", serif;" class="">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 class=""></o:p></div><div style="margin: 0cm 0cm 0.0001pt; font-size: 12pt; font-family: "Times New Roman", serif;" class=""><o:p class=""> </o:p></div><div class="MsoNormal" align="center" style="margin: 0cm 0cm 0.0001pt; font-size: 12pt; font-family: "Times New Roman", serif; text-align: center;"><span lang="EN-US" class=""><hr size="5" width="100%" align="center" class=""></span></div><p class="MsoNormal" style="margin: 0cm 0cm 12pt; font-size: 12pt; font-family: "Times New Roman", serif;"><b class=""><span lang="EN-US" style="font-size: 10pt; font-family: Tahoma, sans-serif;" class="">From:</span></b><span lang="EN-US" style="font-size: 10pt; font-family: Tahoma, sans-serif;" class=""><span class="Apple-converted-space"> </span>Pete Hartman [<a href="mailto:pete.hartman@gmail.com" class="">mailto:pete.hartman@gmail.com</a>]<span class="Apple-converted-space"> </span><br class=""><b class="">Sent:</b><span class="Apple-converted-space"> </span>Friday, September 17, 2021 3:28 PM<br class=""><b class="">To:</b><span class="Apple-converted-space"> </span>David G Dixon<br class=""><b class="">Subject:</b><span class="Apple-converted-space"> </span>Re: [sdiy] Issue with CD4024 Ripple Counter</span><span lang="EN-US" class=""><o:p class=""></o:p></span></p><table class="MsoNormalTable" border="0" cellspacing="0" cellpadding="0" style="border-collapse: collapse;"><tbody class=""><tr class=""><td style="padding: 0.75pt 0.75pt 0.75pt 0cm;" class=""><div style="margin: 0cm 0cm 0.0001pt; font-size: 12pt; font-family: "Times New Roman", serif;" class=""><span style="font-size: 9pt; font-family: Arial, sans-serif; background-color: rgb(255, 236, 179);" class="">[<strong class=""><span style="font-family: Arial, sans-serif;" class="">CAUTION:</span></strong><span class="Apple-converted-space"> </span>Non-UBC Email]</span><o:p class=""></o:p></div></td></tr></tbody></table><div class=""><p class="MsoNormal" style="margin: 0cm 0cm 12pt; font-size: 12pt; font-family: "Times New Roman", serif;">he wasn't saying you were a noob. :)<br class=""><br class="">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 class=""><br class="">I do think fishing a couple out to send to someone to grind down and check would be an interesting exercise.<br class=""><br class=""><o:p class=""></o:p></p></div><div style="margin: 0cm 0cm 0.0001pt; font-size: 12pt; font-family: "Times New Roman", serif;" class=""><o:p class=""> </o:p></div><div class=""><div class=""><div style="margin: 0cm 0cm 0.0001pt; font-size: 12pt; font-family: "Times New Roman", serif;" class="">On Fri, Sep 17, 2021 at 3:28 PM David G Dixon via Synth-diy <<a href="mailto:synth-diy@synth-diy.org" style="color: purple; text-decoration: underline;" class="">synth-diy@synth-diy.org</a>> wrote:<o:p class=""></o:p></div></div><blockquote style="border-style: none none none solid; border-left-width: 1pt; border-left-color: rgb(204, 204, 204); padding: 0cm 0cm 0cm 6pt; margin-left: 4.8pt; margin-right: 0cm;" class=""><div class=""><div style="margin: 0cm 0cm 0.0001pt; font-size: 12pt; font-family: "Times New Roman", serif;" class="">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 class=""></o:p></div><div style="margin: 0cm 0cm 0.0001pt; font-size: 12pt; font-family: "Times New Roman", serif;" class=""> <o:p class=""></o:p></div><div style="margin: 0cm 0cm 0.0001pt; font-size: 12pt; font-family: "Times New Roman", serif;" class=""> <o:p class=""></o:p></div><div class="MsoNormal" align="center" style="margin: 0cm 0cm 0.0001pt; font-size: 12pt; font-family: "Times New Roman", serif; text-align: center;"><hr size="5" width="100%" align="center" class=""></div><p class="MsoNormal" style="margin: 0cm 0cm 12pt; font-size: 12pt; font-family: "Times New Roman", serif;"><b class=""><span style="font-size: 10pt; font-family: Tahoma, sans-serif;" class="">From:</span></b><span style="font-size: 10pt; font-family: Tahoma, sans-serif;" class=""><span class="Apple-converted-space"> </span>bbob [mailto:<a href="mailto:fluxmonk@gmail.com" target="_blank" style="color: purple; text-decoration: underline;" class="">fluxmonk@gmail.com</a>]<span class="Apple-converted-space"> </span><br class=""><b class="">Sent:</b><span class="Apple-converted-space"> </span>Friday, September 17, 2021 12:10 PM<br class=""><b class="">To:</b><span class="Apple-converted-space"> </span>David G Dixon<br class=""><b class="">Cc:</b><span class="Apple-converted-space"> </span>synth-diy mailing list<br class=""><b class="">Subject:</b><span class="Apple-converted-space"> </span>Re: [sdiy] Issue with CD4024 Ripple Counter</span><o:p class=""></o:p></p><table class="MsoNormalTable" border="0" cellspacing="0" cellpadding="0" style="border-collapse: collapse;"><tbody class=""><tr class=""><td style="padding: 0.75pt 0.75pt 0.75pt 0cm;" class=""><div style="margin: 0cm 0cm 0.0001pt; font-size: 12pt; font-family: "Times New Roman", serif;" class=""><span style="font-size: 9pt; font-family: Arial, sans-serif; background-color: rgb(255, 236, 179);" class="">[<strong class=""><span style="font-family: Arial, sans-serif;" class="">CAUTION:</span></strong><span class="Apple-converted-space"> </span>Non-UBC Email]</span><o:p class=""></o:p></div></td></tr></tbody></table><div class=""><div style="margin: 0cm 0cm 0.0001pt; font-size: 12pt; font-family: "Times New Roman", serif;" class="">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. <span class="Apple-converted-space"> </span><o:p class=""></o:p></div><div class=""><div style="margin: 0cm 0cm 0.0001pt; font-size: 12pt; font-family: "Times New Roman", serif;" class=""><o:p class=""> </o:p></div></div><div class=""><div style="margin: 0cm 0cm 0.0001pt; font-size: 12pt; font-family: "Times New Roman", serif;" class="">bbob drake<o:p class=""></o:p></div></div></div><div style="margin: 0cm 0cm 0.0001pt; font-size: 12pt; font-family: "Times New Roman", serif;" class=""><o:p class=""> </o:p></div><div class=""><div class=""><div style="margin: 0cm 0cm 0.0001pt; font-size: 12pt; font-family: "Times New Roman", serif;" class="">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" style="color: purple; text-decoration: underline;" class="">synth-diy@synth-diy.org</a>> wrote:<o:p class=""></o:p></div></div><blockquote style="border-style: none none none solid; border-left-width: 1pt; border-left-color: rgb(204, 204, 204); padding: 0cm 0cm 0cm 6pt; margin-left: 4.8pt; margin-right: 0cm;" class=""><div style="margin: 0cm 0cm 0.0001pt; font-size: 12pt; font-family: "Times New Roman", serif;" class="">So, I went to the lab and set up a little breadboard. I put 4024 on it,<br class="">used my +15V and 0V rails to power it (yes, I decoupled with 104), and I<br class="">also set up a TL072 as a comparator driven by a triangle-wave LFO. I sent<br class="">the output of the comparator through a diode to have it go just between 0V<br class="">and +15V. I tried clocking two CD4024BEs, two CD4024BCNs, and one<br class="">MC14024BCP. The CD4024BCNs didn't even work. The CD4024BEs gave me some<br class="">really hashy looking outputs. The MC14024BCP worked perfectly. Then I<br class="">tested them in an ASR, with similar results.<br class=""><br class="">So, I threw all of the CD4024s into the trash. Unfortunately, I only have<br class="">one MC14024B. I'm going to buy more, cuz they work well, without any<br class="">issues.<br class=""><br class="">Lesson learned, I guess. I'm just not sure what the lesson is, other than<br class="">"don't use CD4XXX chips" or at least ones with edge-driven inputs.<br class="">Argghh!!! Why can't this stuff just work? It's a miracle that we aren't<br class="">still living in caves, wearing skins and hunting sabre-tooth tigers with<br class="">sticks.<br class=""><br class="">_______________________________________________<br class="">Synth-diy mailing list<br class=""><a href="mailto:Synth-diy@synth-diy.org" target="_blank" style="color: purple; text-decoration: underline;" class="">Synth-diy@synth-diy.org</a><br class=""><a href="http://synth-diy.org/mailman/listinfo/synth-diy" target="_blank" style="color: purple; text-decoration: underline;" class="">http://synth-diy.org/mailman/listinfo/synth-diy</a><br class="">Selling or trading? Use<span class="Apple-converted-space"> </span><a href="mailto:marketplace@synth-diy.org" target="_blank" style="color: purple; text-decoration: underline;" class="">marketplace@synth-diy.org</a><o:p class=""></o:p></div></blockquote></div></div><div style="margin: 0cm 0cm 0.0001pt; font-size: 12pt; font-family: "Times New Roman", serif;" class="">_______________________________________________<br class="">Synth-diy mailing list<br class=""><a href="mailto:Synth-diy@synth-diy.org" target="_blank" style="color: purple; text-decoration: underline;" class="">Synth-diy@synth-diy.org</a><br class=""><a href="http://synth-diy.org/mailman/listinfo/synth-diy" target="_blank" style="color: purple; text-decoration: underline;" class="">http://synth-diy.org/mailman/listinfo/synth-diy</a><br class="">Selling or trading? Use<span class="Apple-converted-space"> </span><a href="mailto:marketplace@synth-diy.org" target="_blank" style="color: purple; text-decoration: underline;" class="">marketplace@synth-diy.org</a><o:p class=""></o:p></div></blockquote></div></div><span style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none; float: none; display: inline !important;" class="">_______________________________________________</span><br style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none;" class=""><span style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none; float: none; display: inline !important;" class="">Synth-diy mailing list</span><br style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none;" class=""><span style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none; float: none; display: inline !important;" class=""><a href="mailto:Synth-diy@synth-diy.org" class="">Synth-diy@synth-diy.org</a></span><br style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none;" class=""><span style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none; float: none; display: inline !important;" class=""><a href="http://synth-diy.org/mailman/listinfo/synth-diy" class="">http://synth-diy.org/mailman/listinfo/synth-diy</a></span><br style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none;" class=""><span style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none; float: none; display: inline !important;" class="">Selling or trading? Use <a href="mailto:marketplace@synth-diy.org" class="">marketplace@synth-diy.org</a></span></div></blockquote></div><br class=""></body></html>