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Back/ shell contact, vertical PCB mount, https://www.neutrik.com/en/product/nl4md-v speakON Chassis Connectors, 4 pole male XLR receptacle, grounding: mating connector shell and front panel: 9.8mm (alpha pots sliders: 3mm above panel, ample thunkicons: probably too tight; could work with printed spacers mini toggle: 4mm above panel, ample thunkicons: probably too tight; could work with printed spacers mini toggle: 2.5mm above panel, ample thunkicons: probably too short without extra spacers, use mini toggle switch ON-ON | | | R4, R6, R7 | 3 | 2N3904 | Small Signal NPN Transistor, TO-92"/>