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* Make sure you use a standard 4000 series CMOS, not 74XXX4000 series, e.g. CD4017, MC14017, HEF4017. Markings such as HC4017, HCT4017 imply 74HC4017 and 74HCT4017 and are unsuitable. MC4017 is also unsuitable.
* PCB measures 6" x 2" with 3mm mounting holes 0.15" in from the edges.
== CC-BY-NC ==
Readers are permitted to construct these circuits for their own personal use only. Ken Stone retains all rights to his work.
== See also ==
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