⚠️ The Problem :

Switched-mode power supplies (SMPS) are compact and efficient, but they generate high-frequency noise that can interfere with nearby circuits—especially in audio systems, microcontroller boards, or sensitive analog devices. This unwanted noise often appears as glitches, screen flicker, or humming in speakers.

✅ The Solution :

To control SMPS noise, use filter components like ceramic capacitors, ferrite beads, or common-mode chokes at input and output lines. These components suppress high-frequency switching spikes and smooth out power rails.

🧰 Practical Example :

Let’s say you’re powering an Arduino-based audio project using a cheap 12V SMPS adapter. When the amp turns on, you hear a high-pitched whine. That’s SMPS noise leaking into your circuit. By adding a 100nF ceramic capacitor close to the power input and a ferrite bead in series with VCC, the noise is significantly reduced, and audio output becomes clean.

📐 Sample Calculation :

If noise appears around 100kHz, a simple RC low-pass filter can help:
R = 10Ω, C = 100nF → f = 1 / (2πRC) ≈ 159kHz
This filter attenuates noise near your target frequency—easy, effective, and cheap!

🛒 Product Recommendation :

Use Made in India components for long-term reliability:

• [Ferrite Beads and Chokes]

• [Ceramic Capacitors (100nF, etc.)]

🛍️ Shop now at SmartXProKits.in
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