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<DIV dir=ltr align=left><SPAN class=622240120-17092021>I've used them for years
without issue. This is the first time I've had problems. I'm just
wondering now whether all of my ASRs were actually clocking on the wrong edge
and I just never noticed it.</SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=622240120-17092021></SPAN> </DIV>
<DIV dir=ltr align=left><SPAN class=622240120-17092021>But, if I can't clock it
with a comparator output with a 13V/us slew rate, then it's just too hard, or
else (as I suspect) my chips are faulty.</SPAN></DIV><BR>
<DIV dir=ltr lang=en-us class=OutlookMessageHeader align=left>
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<FONT size=2 face=Tahoma><B>From:</B> bbob [mailto:fluxmonk@gmail.com]
<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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<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">synth-diy@synth-diy.org</A>>
wrote:<BR></DIV>
<BLOCKQUOTE
style="BORDER-LEFT: rgb(204,204,204) 1px solid; 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
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