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Low-Power, Quad-Operational Amplifiers, DIP-14/SOIC-14/SSOP-14 Audio Jack, 2 Poles (Mono / TS) | | | | | | | | C1 | 1 | B20k | Potentiometer | | | | C6, C7, C8, C9 | 5 If we expect or plan on developing modules which use the 4 pins (http://www.qingpu-electronics.com/en/products/WQP-PJ320E-177.html PJ31060-I 6pin SMD 3.5mm stereo headphones jack. Headphones jack plug stereo.

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