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BackHeadphones 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://www.cuidevices.com/product/resource/pdf/sj1-352xn.pdf TRS audio jack stereo TRS 3.5mm, horizontal, through-hole, https://www.cuidevices.com/product/resource/pdf/sj1-352xn.pdf TRS 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) | | R1, R2 | 2 | 10k | Resistor | | | | | Tayda | A-826 | | | | | S1 | 1 | TL074 | Quad operational amplifier, DIP-14"/>