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[Schematic](Docs/precadsr.pdf) * PCB layout: front, back 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 (http://www.china-bsun.com/Product48/1577.html headphones jack (http://www.china-bsun.com/Product48/1577.html headphones jack (http://www.china-bsun.com/Product48/1577.html headphones jack plug stereo 3.5mm PJ31060-I PJ31060 TRS 3.5mm, horizontal, through-hole, https://downloads.lumberg.com/datenblaetter/en/1503_07.pdf TRS audio jack stereo horizontal circular TRS 3.5mm, horizontal, through-hole, https://www.cuidevices.com/product/resource/pdf/sj1-352xn.pdf TRS audio jack stereo TRS 3.5mm, vertical, Thonkiconn, PCB mount, replaces NL4MD-V, NL4MD-V-R, NL4MD-V-S, https://www.neutrik.com/en/product/nl4mdxx-v speakON Chassis Connectors, 4 pole chassis connector, red D-size flange, self tapping screw holes (A-screw), horizontal PCB mount, replaces NL2MD-V, https://www.neutrik.com/en/product/nl2mdxx-v speakON Chassis Connectors, 4 pole male XLR receptacle, grounding: separate ground contact to mating connector shell and front panel, horizontal PCB mount, black chrome shell, https://www.neutrik.com/en/product/nc3fbv1-b B Series, 3 pole female XLR receptacle, grounding: without ground/shell contact, vertical PCB mount, https://www.neutrik.com/en/product/nc3mah A Series, 5 pole female receptacle, grounding: separate ground contact to mating connector shell to pin1 and front panel, horizontal PCB mount, black chrome shell, https://www.neutrik.com/en/product/nc3fbh1-b B Series, 3 pole male XLR receptacle, grounding: ground contact to mating connector shell to pin1 and front panel, horizontal PCB mount, https://www.neutrik.com/en/product/nc3maah-0 AA Series, 3 pole female XLR receptacle.