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A notable issue with this design is the 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 per step, to set clock rate (if onboard clock is used) (rv11 // once/continuous (switch // once/continuous (switch // cv range (sw12 // steps: slider, led, switch (sw1-sw10, rv1-rv10 // mounting holes 33.3mm, distance of mounting holes distance 33.3mm 25-pin D-Sub connector, horizontal/angled (90 deg), THT-mount, male, pitch 2.77x2.84mm, distance of mounting holes 63.5mm, distance of mounting holes 33.3mm, distance of mounting holes 63.5mm, see https://disti-assets.s3.amazonaws.com/tonar/files/datasheets/16730.pdf 9-pin D-Sub connector horizontal with green/yellow.

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