DIY Inductor Sniffer | This Device Will Let You Hear Inductors - 500hz To 2Mhz

DIY Inductor Sniffer: Hear the Invisible!
(500Hz to 2MHz)

Ever wondered what signals are buzzing inside an inductor?

Build this simple, yet powerful Inductor Sniffer and turn electromagnetic fields into audible sounds! This device is perfect for hobbyists, electronics enthusiasts, and anyone curious about the hidden world of signal frequencies in their circuits.

What is an Inductor Sniffer?
An inductor sniffer, or an electromagnetic (EM) probe, uses a simple coil (the inductor) to pick up magnetic fields radiated by nearby components and circuits. By amplifying and processing this signal, we can hear the frequencies present in a circuit, such as switching noise from a power supply, or the signal path of a radio frequency (RF) circuit!

Key Features of this Build:
* Wide Frequency Range: Capable of picking up signals from 500Hz up to 2MHz!
* Simple Circuit: Built around the versatile and affordable LM358 Dual Operational Amplifier .
* Audible and Visual Indication: Features both a buzzer for sound output and an LED for visual signal indication.

* Low Power: Operates on a simple 5V to 10V DC supply.

⚙️ Components You Will Need:
| Component | Value/Type | Notes |

| Op-Amp | LM358 | The heart of the circuit |
| Inductor (Sniffer Coil) | 5 - 2mH |
| Capacitor | 470uF | Power rail decoupling/filtering |
| Resistors | 100K, 30K, 1K, 18K, 360 | resistors |
| Visual Indicator | LED (e.g., Red) | Any standard LED |
| Audio Indicator | Buzzer (e.g., Piezo) |
| Power Supply | 5V - 10V DC | Battery

How the Circuit Works (Simplified):
* Sensing: The 5-2mH Inductor acts as a probe, picking up stray magnetic fields.
* Input Conditioning: The signal from the inductor is conditioned by the first half of the LM358 (pins 1, 2, 3), likely acting as a high-gain non-inverting amplifier.
* Amplification & Output: The second half of the LM358 (pins 5, 6, 7) takes the amplified signal and drives the output stage, which includes:
* The Buzzer (R11/18K\Omega and R10/360\Omega resistors set the drive level/gain).
* The LED (protected by the 1K\Omega resistor).
Check out the circuit diagram in the video for the full wiring details!

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