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Schematic annotation Add 55k-ish resistor to coarse knob to fix - Errant connection between R25 and R1, probably a result of switching to pcb-mounted panel components and interconnects between middle and bottom offsetToMountHoleCenterX = hp - holeOffset; // 1 for 5v / 2.5v output mode (sw12) // 1 hp from side to center of hole, with a 7-segment display with a half threaded nose, sleeve contact/front panel connection, https://www.neutrik.com/en/product/nrj6hh-1 Slim Jacks, 6.35mm (1/4in) stereo jack, switched, fully threaded nose, https://www.neutrik.com/en/product/nrj6hf-au Slim Jacks, 6.35mm (1/4in) switching stereo jack and switching ground contact, vertical PCB Cherry MX keyswitch, 2.25u, plate mount, http://cherryamericas.com/wp-content/uploads/2014/12/mx_cat.pdf Cherry MX keyswitch, 2.00u, http://matias.ca/switches/ Matias ALPS keyswitch 2.25u plate Cherry MX keyswitch 1.00u PCB Cherry MX keyswitch 2.00u Matias/ALPS keyswitch, 1.50u, plate mount, http://cherryamericas.com/wp-content/uploads/2014/12/mx_cat.pdf Cherry.