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Or 2.5mm center pin, https://www.kycon.com/Pub_Eng_Draw/KLDX-0202-AC%20&%20BC.pdf power jack works physically for male connector from wall wart. Consider adding larger pads. Consider adding a switch to disable clock (pause). SPST switch to set clock rate (if onboard clock is used // 11 SPDT switches 13 SPDT switches: // 1 rotary switch - 9.5mm, +5mm extra space available - mini toggle switch // reset (manual) -- this means from the centerline of the hole for mounting screw: ISO 1481-ST 2.2x4.5 C or ISO 7049-ST 2.2x4.5 C (http://www.fasteners.eu/standards/ISO/7049/) .

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