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BackConnectors, 4 pole chassis connector, grey D-size flange, mirrored self tapping screw holes (A-screw), horizontal PCB mount, https://www.neutrik.com/en/product/nc3fav1 A Series, 3 pole male XLR receptacle, grounding: separate ground contact to mating connector shell to pin1 and front panel: mini toggle: 4mm above panel, tight but possible micro toggle: probably too short without extra spacers, use mini toggle switch ON-ON | | | | | | | | | L1 | 1 Hardware/lib/aoKicad | 1 | 1 | 10nF | Film capacitor | | J12 | 1 | ICM7555xP | CMOS General Purpose Timer, 555 compatible, PDIP-8 0.2A Ic, 40V Vce, Small Signal NPN Transistor, TO-92