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Many threads are old and I can?t finish all the threads. I want to call on friends all over the world to work together to study an excellent pi machine. I hope you can put all the problems in this thread, and then We discuss how to solve this problem. My first problem today is the application of preamplifiers. What kind of op amp is most suitable and how to connect with the coil? How to achieve the lowest noise? I hope everyone can discuss together, thank you!