can´t identify the toroid inductor´s microhenry on this pcb, please help

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You need an LCR meter to measure the inductance of the toroid inductor. You can buy a good one. Fluke is good. If your budget is tight or you do not wanna buy one, you can make an LCR meter at home. Here is a detailed tutorial on how to make an LCR meter by yourself.

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DIY Transistor Tester | Build Your Own LCR Meter at Home with Arduino Nano - Share Project - PCBWay

Are you fascinated by electronics and want to create your own tools for testing components? Building a DIY Transistor Tester and LCR Meter is a fantastic way to enhance your electronics lab! In this g...
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This design is based on Arduino Nano. An LCR Meter measures inductance (L), capacitance (C), and resistance (R), making it an invaluable tool for diagnosing electronic components. A Transistor Tester expands its functionality by testing semiconductors like transistors, diodes, and MOSFETs. By building your own, you not only save money but also learn the principles behind these measurements. Code, circuit diagram all are given.
 

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