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High enough voltage to trigger steps. Replace C10 with 100K resistor, and bridge out R44 with a diameter between 16-19 mm: https://www.keyelco.com/product.cfm/product_id/826 Keystone #500, CR1220 battery holder, Keystone P/N 2468, http://www.keyelco.com/product-pdf.cfm?p=1033 AAA battery holder Keystone #500, 12mm CR1220 battery holder, Memory Protection Devices P/N BA9VPC, http://www.memoryprotectiondevices.com/datasheets/BA9VPC-datasheet.pdf PP3 Battery Holder BA9VPC 9V 2xAA cell battery holder, Keystone P/N 2462, https://www.keyelco.com/product-pdf.cfm?p=1027 1xAAA Battery Holder, Keystone, Plastic Case, http://www.keyelco.com/product-pdf.cfm?p=1031 AAA battery cell holder CR2032 retainer clip, SMT ( http://www.farnell.com/datasheets/1505853.pdf BC-2001 CR2032 2032 Battery Holder BH-331P Battery Type 3xAA battery CR1225 coin cell retainer BR2016 CR2016 DL2016 BR2020 CL2020 BR2025 CR2025 DL2025 DR2032 CR2032 DL2032 Keystone type 103 battery holder Keystone type 3008 coin cell vertical Panasonic CR-1632-V1AN battery, https://industrial.panasonic.com/cdbs/www-data/pdf2/AAA4000/AAA4000D464.PDF battery CR-1632 coin cell vertical Panasonic CR-2354/VCN battery, https://industrial.panasonic.com/cdbs/www-data/pdf2/AAA4000/AAA4000D486.PDF battery CR-2354/VCN coin cell Panasonic CR-2477/VCN battery, https://industrial.panasonic.com/cdbs/www-data/pdf2/AAA4000/AAA4000D502.PDF battery CR-2477 coin cell Panasonic CR-2477/VCN battery, https://industrial.panasonic.com/cdbs/www-data/pdf2/AAA4000/AAA4000D502.PDF battery CR-2477 coin cell vertical Panasonic CR-3032/VCN battery, https://industrial.panasonic.com/cdbs/www-data/pdf2/AAA4000/AAA4000D508.PDF battery CR-3032 coin cell vertical Panasonic CR-2450/VAN battery, https://industrial.panasonic.com/cdbs/www-data/pdf2/AAA4000/AAA4000D492.PDF battery CR-2450 coin cell vertical Cherry MX keyswitch, 1.75u, http://matias.ca/switches/ Matias ALPS keyswitch 1.75u Matias/ALPS keyswitch, 1.00u, PCB mount, retention spring, https://www.neutrik.com/en/product/ncj10fi-h Combo I series, 3 pole female receptacle, grounding: mating connector shell and front panel, steel retention lug, horizontal PCB mount, retention spring, no latch, https://www.neutrik.com/en/product/nc3fbv1-0 B Series, 3 pole female XLR receptacle, grounding: separate ground contact to mating connector shell and front panel, horizontal PCB mount, https://www.neutrik.com/en/product/nl4md-v-1 speakON Chassis Connectors, 8 pole chassis connector, nickel metal square G-size flange, self tapping screw holes (A-screw), horizontal PCB mount, https://www.neutrik.com/en/product/nc5fbv A Series, Chassis connector Phoenix H male (A series layout), mates with Phoenix MSTB 2,5/3-ST, horizontal PCB mount, https://www.neutrik.com/en/product/nc4mbv A Series, 3.

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