Como Medir Indutância com um Circuito Simples usando o CI 555

How to measure the inductance of small coils without using an LCR meter? In this video, we will analyze a simple circuit based on the 555 IC, capable of testing and estimating inductors in the approximate range of 10 µH to 1000 µH. We will begin by understanding what inductance is, how the inductor stores energy in the magnetic field, and why a common multimeter only measures the winding resistance, not directly revealing the inductive behavior of the component. Next, we will study the INS137 circuit, by Newton C. Braga, divided into blocks: ✅ Astable oscillator with 555 IC ✅ Signal generation between approximately 50 kHz and 200 kHz ✅ Voltage divider formed by R3 and the inductor ✅ Inductive reactance XL=2πfL ✅ Detector with capacitor and 1N34 germanium diode ✅ Indication by microammeter ✅ Adjustment and calibration with known inductors ✅ Identification of open, shorted, or altered value coils You will also see the pinouts of the 555 IC, the complete signal path, and the function of each component in the circuit. This meter is a comparative and educational instrument. It requires calibration and does not replace a precision LCR meter, but it is an excellent tool for students, technicians, radio amateurs, and those interested in electronics. 📚 Reference used: Newton C. Braga — How to Test Small Inductors (INS137) https://www.newtoncbraga.com.br/testa... 📡 Comment: Have you ever found an unidentified coil on a circuit board? 👍 Like, subscribe to the channel, and share with anyone interested in electronics, physics, and amateur radio. #Inductance #Inductor #IC555 #Electronics #Coil #AmateurRadio #ElectronicCircuit #NE555 #PracticalElectronics