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  1. Can MOS tube F9530 be replaced by IRF640, IRF740? A module shuts down immediately after it is turned on. It is possible that the F9530 is broken, and I want to find a replacement tube. Introduction of IRF740: https://www.utmel.com/components/irf740-power-mosfet-replacement-price-and-circuit?id=458
  2. How to design a speed detection circuit with LM2907? It's about graduation thesis, please help. Thanks in advance.
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