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Contact, horizontal PCB mount, black chrome shell, https://www.neutrik.com/en/product/nc5mbv-b B Series, 3 pole XLR female receptacle with 6.35mm (1/4in) stereo jack, horizontal PCB mount, https://www.neutrik.com/en/product/nc4fbv A Series, 5 pole male XLR receptacle, grounding: mating connector shell to pin1 and front panel, steel retention lug, lateral left PCB mount, black chrome shell, https://www.neutrik.com/en/product/nc3fbv2-b B Series, 3 pole female XLR receptacle, switching contacts, grounding: separate ground contact to mating connector shell and front panel: mini toggle: 4mm above panel, tight but possible mini toggle: 4mm above panel, tight but possible mini toggle: 2.5mm above panel, ample thunkicons: probably too short without extra spacers, use mini toggle switch ON-ON | | R3, R7 | 3 | 4.7k | Resistor | | | | | | | | | R4, R12, R13 | 3 | 10uF | Electrolytic capacitor | | | | R30 | 1 | ICM7555xP | CMOS General Purpose Timer, 555 compatible, PDIP-8 Quad operational amplifier, DIP-14 | | Q1, Q2, Q3 | 3 | A1M | \*\*Potentiometer, 9 mm vertical board mount | | | | | | J1 | 1 | ICM7555xP | CMOS General Purpose Timer, 555 compatible, PDIP-8 0.2A Ic, 40V Vce, Small Signal NPN Transistor, TO-92 R16, R17, R19.

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