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10.0mm 3 pins UFQFPN 20-lead, 3 x switching (normalling) stereo jack B-gauge type (T/TN/R/RN/S/SN), https://www.neutrik.com/en/product/nj6tb-v M Series, 6.35mm (1/4in) switching stereo jack without switching contact, horizontal PCB mount, retention spring, https://www.neutrik.com/en/product/ncj10fi-h Combo I series, 3 pole female XLR receptacle, grounding: separate ground contact to mating connector shell to pin1 and front panel, horizontal PCB mount, http://cherryamericas.com/wp-content/uploads/2014/12/mx_cat.pdf Cherry MX keyswitch 1.75u PCB Cherry MX keyswitch, 1.50u, http://matias.ca/switches/ Matias ALPS keyswitch ISO enter 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, Gray code, https://www.nidec-copal-electronics.com/e/catalog/switch/sh-7000.pdf SMD SMT crystal oscillator Miniature Crystal Clock Oscillator TXCO Fordahl DFA S3-KS/LS/US, http://www.iqdfrequencyproducts.com/products/details/iqxo-70-11-30.pdf, 9.1x7.2mm^2 package Miniature Crystal Clock Oscillator EuroQuartz XO91 series, http://cdn-reichelt.de/documents/datenblatt/B400/XO91.pdf, hand-soldering, 7.0x5.0mm^2 package FOX SMD Crystal Oscillator Seiko Epson SG-8002CE https://support.epson.biz/td/api/doc_check.php?mode=dl&lang=en&Parts=SG-8002DC.

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