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+--- Thread: Triggering the Data input of a CD4015 from Gate sequencers (/showthread.php?tid=5445)
Triggering the Data input of a CD4015 from Gate sequencers - SynthWizard - 10-01-2019
Triggering the Data input of a CD4015 from Gate sequencers
That would have been my guess. Most CMOS chips like a high voltage level close to the supply voltage, the 4017 in particular
http://electro-music.com/forum/viewtopic.php?p=441851#441851