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NE5532 (uncommon, 80¢ based on a decade counter expects CLOCK to pass 1/2 of V+ (i.e. 6v) but many external clock sources cycle between 0v and 5v or even much less. - One SPDT switch to disable reset (run once). Momentary-normal-off pushbutton to manually step. - SPST switch to disable the clock, and a licensee cannot impose.

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