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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 horizontal PJ311 6pin SMD 3.5mm headphones jack plug stereo 3.5mm PJ31060-I PJ31060 TRS 3.5mm, horizontal, through-hole, https://downloads.lumberg.com/datenblaetter/en/1503_07.pdf TRS audio jack stereo horizontal circular TRS 3.5mm, horizontal, through-hole, , circular holeshttps://www.cui.com/product/resource/sj1-353xng.pdf TRS audio jack stereo horizontal waterproof 6.35mm (1/4 in) Vertical Jack, 2 Poles (Mono / TS) | | | | D3, D4, D5, D6, D7, D8, D9, D10 100V 0.15A standard switching diode, DO-35 | | J6 | 1 | B10k | Potentiometer | | | | | | C9 | 4 | 100k | Resistor | | R25 | 1 | Conn_01x10 | Pin header, 2.54 mm, 1x10 | | | | | | C1, C11 | 3 | 1k | Resistor | | S3 | 1 | ICM7555xP | CMOS General Purpose Timer, 555 compatible, PDIP-8 Quad operational amplifier, DIP-14