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BackBe added] ## Documentation: * [Schematic](Docs/precadsr.pdf) * PCB layout: [front](Docs/precadsr_layout_front.pdf), [back](Docs/precadsr_layout_back.pdf) * [BOM](Docs/precadsr_bom.md) * [Build notes](Docs/build.md) How to use the 4 pins (http://www.qingpu-electronics.com/en/products/WQP-PJ320E-177.html PJ31060-I 6pin SMD 3.5mm stereo headphones jack. Headphones jack plug stereo 3.5mm PJ31060-I PJ31060 TRS 3.5mm, horizontal, through-hole, https://www.cuidevices.com/product/resource/pdf/sj1-352xn.pdf TRS audio jack horizontal A Series, 3 pole female XLR receptacle, grounding: without ground/shell contact, vertical PCB mount, retention spring instead of latch, https://www.neutrik.com/en/product/nc3faav1-0 AA Series, 3 pole male XLR receptacle, grounding: mating connector shell to pin1 and front panel, vertical PCB mount, https://www.neutrik.com/en/product/nl4md-v-2 speakON Chassis Connectors, 4 pole male XLR receptacle, grounding: mating connector shell and front panel, horizontal PCB mount, https://www.neutrik.com/en/product/nc3fbv2 AA Series, 3 pole male XLR receptacle, grounding: ground contact to mating connector shell and front panel, steel retention lug, lateral left PCB mount, https://www.neutrik.com/en/product/nc4mbv A Series, 3 pole male XLR receptacle, grounding: mating connector shell and front panel, vertical PCB mount, https://www.neutrik.com/en/product/nc3faah AA Series, 3 pole female XLR receptacle, grounding: separate ground contact to mating connector shell to pin1 and front panel, horizontal PCB mount, https://www.neutrik.com/en/product/nc4fbh B Series, 4 pole female XLR receptacle, grounding: mating connector shell and front panel, lateral right PCB mount, https://www.neutrik.com/en/product/nc3mahl A Series, 5 pole female XLR receptacle, grounding: without ground/shell contact, vertical PCB mount, http://cherryamericas.com/wp-content/uploads/2014/12/mx_cat.pdf Cherry MX keyswitch 2.00u vertical plate Cherry MX keyswitch, 1.00u, PCB mount, retention spring instead of latch, https://www.neutrik.com/en/product/nc4fav-0 A Series, 3 pole male XLR receptacle, grounding: separate ground contact to mating connector shell and front panel, lateral right PCB mount, https://www.neutrik.com/en/product/nl4md-h speakON Chassis Connectors, 4 pole chassis connector, black D-size flange, self tapping screw holes (A-screw), vertical PCB mount, https://www.neutrik.com/en/product/ncj6fa-v Combo I series, 3 pole XLR female receptacle with 6.35mm (1/4in) stereo jack, switched, fully threaded nose, https://www.neutrik.com/en/product/nrj6hh Slim Jacks, 6.35mm (1/4in) stereo jack, switched, with chrome ferrule and straight PCB pins, https://www.neutrik.com/en/product/nmj6hfd2 M Series, 6.35mm (1/4in) stereo jack and switching ground contact, horizontal PCB mount, replaces NL4MD-V-2, https://www.neutrik.com/en/product/nl4mdxx-v-2 speakON Chassis Connectors, 4 pole chassis connector, grey D-size flange, self tapping screw holes (A-screw), horizontal PCB mount, retention spring, no latch, https://www.neutrik.com/en/product/nc3fbv1-0 B Series, 3 pole XLR female receptacle with 6.35mm (1/4in) jack receptacle, horizontal pcb mount, https://www.neutrik.com/en/product/nlj2md-h speakON Combo, 2 pole chassis connector, black D-size flange, mirrored self tapping screw.
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