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To pass 1/2 of V+ (i.e. 6v) but many external clock sources cycle between 0v and 5v or even much less. - One SPST switch per step, to set output voltages. (10 - One SPDT switch per step, to set clock rate (if onboard clock is used // 11 SPDT switches 13 SPDT switches 1 rotary switch - 7mm, with 3-4mm extra space available - mini toggle pushbuttons: ample space above 11.75mm (existing 1p12t rotaries, use 11.25mm holes to PCB edge 9.12mm, see https://disti-assets.s3.amazonaws.com/tonar/files/datasheets/16730.pdf 26-pin D-Sub connector straight vertical THT female pitch 2.77x2.54mm pin-PCB-offset 9.4mm 25-pin D-Sub connector straight rugged MUSB D511 USB 2.0 Type C (https://www.bulgin.com/products/pub/media/bulgin/data/Battery_holders.pdf Comfortable Electronic CR2450 battery holder, http://www.keyelco.com/product-pdf.cfm?p=710 Battery holder for 18650 cylindrical cells http://www.keyelco.com/product.cfm/product_id/918 Keystone type 3034 coin cell battery holder, http://www.keyelco.com/product-pdf.cfm?p=710 Battery holder for 18650 cylindrical cells http://www.keyelco.com/product.cfm/product_id/918 Keystone type 1057 coin cell vertical Panasonic CR-1632-V1AN battery, https://industrial.panasonic.com/cdbs/www-data/pdf2/AAA4000/AAA4000D464.PDF battery CR-1632 coin cell retainer CR2032 BR2032 BatteryHolder Battery.

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