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Contacts, 3.5mm audio plug, https://www.cuidevices.com/product/resource/pdf/sp-3541.pdf DC Barrel Jack 2mm or 2.5mm center pin, https://www.kycon.com/Pub_Eng_Draw/KLDX-0202-AC%20&%20BC.pdf power jack - Confirm barrel power jack works physically for male connector from wall wart. - Consider adding larger pads. Consider adding a switch to adjust CV output range, switch between 5v and 2.5v max. One per step, to indicate current step. (10 - One SPDT switch to disable the clock, and a momentary-on button to advance the step.

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