Reference for the principle of the solution: https://wenku.baidu.com/view/3ca9fcc858f5f61fb7366657.html The devices used here are easy to buy and not expensive. This solution was initially able to achieve 20mv, but later it was found that the noise increase effect Not ideal. What needs to be improved here is that the filter link should be changed from a fourth-order low-pass to an eighth-order bandpass. If the other parts are modified, the analog switch can be better, but in fact this analog switch can also be used. For reference only, the pure hardware solution has no other accessories. The input uses two coaxial connectors, or a 3.5mm interface is used to meet the requirements of the question when using a player to play. The final output is on the bottom pin header, powered by dual power supplies, and the test points in the middle are all lead out.
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