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SPDT switch, needed a nut behind the front to indicate current step. (10 Momentary-normal-off pushbutton to manually reset. LEDs: One per step, to set output voltages. (10) One potentiometer for internal clock rate. - One potentiometer per step, to set output voltages. (10 - CLOCK out - could be done with a diameter between 16-19 mm: https://www.keyelco.com/product.cfm/product_id/826 Keystone #500, 12mm CR1220 battery holder, http://www.keyelco.com/product-pdf.cfm?p=710 Battery holder for 2020, 2025 and 2032 coincell batteries. Http://www.keyelco.com/product-pdf.cfm?p=798 Keystone type 1057 coin cell cr1216 cr1220 cr1225 1xPP3 (9V.

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