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Essentially a 4-stage RC network but with an eye towards doing it all in one module with a diameter between 16-19 mm: https://www.keyelco.com/product.cfm/product_id/826 Keystone #500, CR1220 battery holder, http://www.keyelco.com/product-pdf.cfm?p=710 AA CR2 A battery holder Keystone type 107 battery holder Keystone type 107 battery holder Keystone type 2993 negative battery contact Keystone type 3034 coin cell retainer CR2032 BR2032 BatteryHolder Battery AA battery holder Keystone type 3001 coin cell retainer SMT battery holder Keystone type 106 battery holder Keystone type 3034 coin cell retainer CR2032 BR2032 BatteryHolder Battery AA battery cell holder Keystone type 107 battery holder coin cell holder 2xAA cell battery holder, Memory Protection Devices P/N BC12AAPC, http://www.memoryprotectiondevices.com/datasheets/BC12AAPC-datasheet.pdf BC2003 CR2032 2032 Battery Holder 18650 Battery Holder SMD Tactile Switch, https://www.e-switch.com/system/asset/product_line/data_sheet/165/TL3342.pdf SWITCH SMD KSA SW 4-bit rotary coded switch, J-hook, https://www.nidec-copal-electronics.com/e/catalog/switch/sh-7000.pdf 4-bit rotary coded switch, J-hook, https://www.nidec-copal-electronics.com/e/catalog/switch/sh-7000.pdf 4-bit rotary coded switch, gull wing, https://www.nidec-copal-electronics.com/e/catalog/switch/sh-7000.pdf.

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