⚠️ The Problem :

Switch Mode Power Supplies (SMPS) are efficient, compact, and perfect for modern electronics. But they often introduce high-frequency noise on the output, which can interfere with sensitive components like sensors, audio circuits, or microcontrollers.

🧠 The Solution :

This noise is typically caused by high-speed switching inside the SMPS. It can lead to erratic sensor readings, distorted audio, or even MCU resets. The good news? You can fix this with simple filters.

🛠️ Real-World Example

Let’s say you’re powering an Arduino and a microphone module with a 5V SMPS. You hear a buzzing noise in your audio. By adding an LC filter (inductor + capacitor) at the SMPS output, you smooth out voltage ripples, cleaning the supply line.

📐 Sample Calculation

For a basic LC filter:

• Choose L = 10µH, C = 100µF

• fc​=2πLC​1​=2π10×10−6×100×10−6​1​≈1.6kHz

This attenuates high-frequency noise without affecting 5V DC output.

🔌 Try These Made in India Components

• Inductor 10µH

• Electrolytic Capacitor 100µF

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