[sdiy] Issue with CD4024 Ripple Counter

Mattias Rickardsson mr at analogue.org
Sun Sep 19 10:46:12 CEST 2021


David G Dixon via Synth-diy <synth-diy at synth-diy.org> skrev:

>
> 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.


There are also lots of components that could lead to unexpected behavior.
The capacitance of the zener diode, for instance, could that contribute?

/mr
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