[sdiy] Issue with CD4024 Ripple Counter

Ingo Debus igg.debus at gmail.com
Sun Sep 19 11:52:08 CEST 2021


> Am 19.09.2021 um 07:26 schrieb David G Dixon via Synth-diy <synth-diy at synth-diy.org>:
> 
> The threshold of the comparator is set to a little
> less than 2V.  Hence, when the LFO signal rises above this threshold, or
> when the momentary switch is pressed, the comparator output is negative.
> The diode changes this to about 0V.  When the clock signal is less than
> about 2V or the momentary switch is not pressed, then the comparator output
> is positive.

That comparator has no hysteresis. This could be the reason for some spurious transitions to sneak in. To add hysteresis, try a resistor from the comparator’s output to its noninverting input.

Ingo


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