- 2 x switching (normalling) stereo jack without switching contact, vertical PCB mount, asymmetric push, https://www.neutrik.com/en/product/ncj6fa-h-da Combo A series, 3 pole female XLR receptacle, grounding: separate ground contact to mating connector shell to pin1 and front panel, horizontal PCB mount, asymmetric push, https://www.neutrik.com/en/product/nc3faav1-da AA Series, 3 pole female XLR receptacle, grounding: mating connector shell and front panel, steel retention lug, lateral left PCB mount, https://www.neutrik.com/en/product/nc3mbh-1 B Series, 3 pole female receptacle, grounding: separate ground contact to mating connector shell to pin1 and front panel, vertical PCB mount, retention spring instead of A4 Updates from real TL0x4s Compare 6 commits » 2bd01a1ff2 Add schematic, start on PCB Added hard sync to schematic, laid out PCB with exploratory 8hp layout.