[sdiy] Issue with CD4024 Ripple Counter

Jay Schwichtenberg jschwich53 at comcast.net
Fri Sep 24 03:00:55 CEST 2021


David,

Just for grins you might fire off an email to the manufacture(s) and see 
what they have to say. Provide the info on the chips either with photos 
or in text.

Maybe they will or won't reply, I've been surprised sometimes with free 
stuff.

Jay S.

On 9/23/2021 4:32 PM, David G Dixon via Synth-diy wrote:
> So, today I bought four more CD4024s from my local shop (Lee's Electronic
> Components on Fraser St. in Vancouver) -- two CD4024BCN and two CD4024BE --
> and I tested them on my breadboard with the CD40106 oscillator.
>
> Results: Same.  BCN work fine, BE clock backwards.
>
> I noticed that the other verbiage on the BEs is the same as the ones I had:
>
> 10Y2FKM
>
> This means that they are all from the same batch, and they are obviously all
> defective.  I'm going to tell Lee's about it, and I also have a case opened
> with TI Customer Support to discuss it.
>
> In other news, I took to heart what someone here said (can't remember who),
> and I've redesigned the circuit around a single 311 comparator and a 4013
> dual D flip-flop (which I also bought several of today).  This is a simpler
> circuit with fewer components (fewer resistors, no diodes), and since the
> 4013 is clocked on the positive edge, I don't need an inverter -- I'm just
> going to divide the comparator output by a factor of two with a couple of
> 4.99k resistors and send that directly to the Gate Out jack.  I know it's
> not buffered, but I'm expecting that it will mostly be plugged into things
> with 100k input impedance, so no worries.
>
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