⚠️ The Problem: Voltage Spikes in SMPS Circuits

Switched Mode Power Supplies (SMPS) are efficient but can generate high-frequency voltage spikes during switching. These spikes may damage microcontrollers, sensors, and delicate circuits—especially in DIY and prototype builds where proper filtering is often overlooked.

🔧 The Solution: Snubber Circuits & TVS Diodes

To fix this, add RC snubber circuits across switching components or use TVS (Transient Voltage Suppression) diodes across outputs. These components absorb the voltage spikes and smooth out the power supply line—making your circuit more robust and noise-resistant.

🛠 Practical Example: Controlling a Relay with SMPS

A prototyper in Bengaluru noticed their microcontroller was randomly resetting when switching a 12V relay powered by an SMPS. Adding a TVS diode (12V) at the relay power line and a snubber RC filter (100Ω + 100nF) across the relay coil stopped the spikes—restoring stability.

📐 Sample Calculation: Snubber Resistor Power

If spike current = 0.1A, and snubber resistor = 100Ω:

Power = I² × R = 0.1² × 100 = 1W → Use a 2W resistor for safety margin.

🛒 Product Suggestion :

Use TVS Diodes and Snubber Resistors, Made in India, to spike-proof your circuits.

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