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BackChassis connector Phoenix H male (A series layout), horizontal PCB mount, https://www.neutrik.com/en/product/nl4md-v speakON Chassis Connectors, 4 pole female XLR receptacle, grounding: 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 | | Tayda | A-1847 | | | | S3 | 1 | LM358 | Low-Power, Dual Operational Amplifiers, DIP-14/SOIC-14"/>