[sdiy] Issue with CD4024 Ripple Counter

David G Dixon dixon at mail.ubc.ca
Sun Sep 19 06:58:04 CEST 2021


I should also mention that, on the ASR, the signal from the diode to the
Clock pin also goes through a 10k resistor to a 5.1V zener to ground, then
through another 10k resistor into an inverting opamp with a 5V level shift
(-12V through a 24k resistor into the inverting node).  Hence, there are
lots of places for pent-up current to leak off to.
 

-----Original Message-----
From: Synth-diy [mailto:synth-diy-bounces at synth-diy.org] On Behalf Of m
brandenberg
Sent: Saturday, September 18, 2021 12:04 PM
To: 'synth-diy mailing list'
Subject: Re: [sdiy] Issue with CD4024 Ripple Counter

[CAUTION: Non-UBC Email]

On Sat, 18 Sep 2021, David G Dixon via Synth-diy wrote:

> Also, I would remind you that I set up a test rig on breadboard, with 
> similar circuitry (an opamp comparator into a diode), and the 4024s 
> either didn't work or looked real bad (lots of hash) even though the 
> driving waveform is very clean.

Sorry to belabor the point but the 'one diode' mention has made me twitch
twice now.  Is that one diode feeding into a passively pulled up (or down)
input or one diode into a floating node that might be drifting around
metastability?


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