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BackQingpu 3.5mm horizontal headphones jack, http://akizukidenshi.com/download/ds/switronic/ST-005-G.pdf Connector Audio Switronic ST-005-G 3.5mm Horizontal Waterproof Stereo Headphones Jack, https://www.technik.com.hk/images/pdf_product/WP3002-PA66-A.pdf audio jack stereo horizontal waterproof 6.35mm (1/4 in) Vertical Jack, 2 Poles (Mono / TS), Switched T Pole (Normalling Audio Jack, 2 Poles (Mono / TS), Switched T Pole (Normalling) | | | | Tayda | A-962 | | | U3 | 1 | B20k | Potentiometer | | R9, R11, R13 | 3 | 1k | Resistor | | S3 | 1 | ICM7555xP | CMOS General Purpose Timer, 555 compatible, PDIP-8"/>