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SMPS EMI Suppression Techniques – A Simple Guide for Electronics Hobbyists and Engineers in India

SMPS EMI suppression

One common issue faced by hobbyists and engineers is reverse polarity—when power is supplied in the wrong direction, potentially damaging sensitive components in a circuit. A simple yet effective way to fix this problem is by using relay circuits with reverse polarity protection.

 

The Problem :

 

A relay is an electrical switch that can help control the flow of power in your circuit. It acts as a safeguard, allowing the circuit to work only when the polarity is correct. If the polarity is reversed, the relay will prevent the flow of current, saving your components from potential damage.

 

Practical Example :

 

Let’s say you’re building a DC motor circuit powered by a battery. If you connect the battery in reverse, your motor and controller could be ruined. By adding a relay with reverse polarity protection, you can ensure that your motor only receives power when the polarity is correct.

 

Sample Calculation :

 

Let’s assume you’re using a 12V DC motor.

The relay’s coil requires 9V and draws a current of 30mA.

The total power for the relay coil would be:

Power = Voltage x Current = 9V x 0.03A = 0.27W.

 

Suggested Products :

 

For reliable protection, you can use relays and MOSFETs that are perfect for reverse polarity protection. Shop now for Made in India components at SmartXProKits. Support our work and India’s innovation—buy from our Make in India site!

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