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1xPP3 (9V) battery holder, http://www.comf.com.tw/ProductDetail.asp?no=148 Keystone type 2998 battery holder Keystone type 105 battery holder Keystone SMT (Auto-In/Ultra-Low) Holder for 2032 Cell, 33.2 x 23.9mm, 2mm height above PCB, https://www.keyelco.com/userAssets/file/M65p4.pdf Keystone type 3000 coin cell vertical Panasonic CR-2032/VS1N battery, https://industrial.panasonic.com/cdbs/www-data/pdf2/AAA4000/AAA4000D348.PDF battery CR-2032 coin cell retainer Keystone type 3000 coin cell vertical Cherry MX keyswitch, 6.25u, PCB mount, retention spring instead of latch, https://www.neutrik.com/en/product/nc3faah2-0 AA Series, 3 pole male XLR receptacle, grounding: mating connector shell and front panel, vertical PCB mount, https://www.neutrik.com/en/product/nc3mbh-1 B Series, 3 pole male XLR receptacle, grounding: separate ground contact to mating connector shell to pin1 and front panel, vertical PCB mount, asymmetric push, https://www.neutrik.com/en/product/ncj6fa-v-da Combo A series, 3 pole female XLR receptacle, grounding: ground contact to mating connector shell and front panel. Current design uses six IDC 2×8 connectors with 4 unused pins if supplying power, but not also under the smaller board. // margins from edges v_margin = hole_dist_top*2 + thickness.

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