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BackConnector (https://www.cui.com/product/resource/sj-352x-smt-series.pdf 3.5mm audio cui horizontal jack stereo horizontal waterproof 6.35mm (1/4 in) Vertical Jack, 2 x 6mm drills Triple banana socket, footprint - 2 pin Molex connector KK254 Molex connector 2.54 mm spacing | | | | | R15, R17, R19 | 2 | 1N5817 | Schottky diode | | R14 | 1 | ICM7555xP | CMOS General Purpose Timer, 555 compatible, PDIP-8"/>