💡 The Problem :

Switch Mode Power Supplies (SMPS) are compact and efficient, but they often generate ripple—tiny AC fluctuations on the DC output. For sensitive electronics like microcontrollers, audio circuits, or ADCs, even small ripples can cause random resets, noise, or measurement errors.

🛠️ The Solution :

To reduce ripple, use a combination of:

• Low ESR capacitors (Electrolytic + Ceramic) at the output

• Inductors or ferrite beads to filter high-frequency noise

• Optionally, add an LDO regulator after the SMPS for ultra-clean output

🔍 Practical Example :

You’re powering a Raspberry Pi or an Arduino-based sensor node with a 12V SMPS. The sensor readings are unstable. On probing the output, you notice ~200mV peak-to-peak ripple. By adding a 470µF low-ESR electrolytic capacitor and a 100nF ceramic capacitor near the load, the ripple drops to <50mV—resulting in stable readings.

🧮 Sample Calculation :

For a capacitor to reduce ripple voltage:

C=2×f×Vr​I​=2×50kHz×0.1V0.5A​=50µF

Use ≥100µF to handle margin and ESR variations.

🛒 Product Suggestion – Made in India :

Enhance your power design with low ESR capacitors and ferrite beads, proudly Made in India:

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🔧 Get Ferrite Beads

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