Is there any electronic product that can be called free from interference due to electric signals? Simply No! What is this sound all about? In simple language, the electric signals that interfere with the normal functioning of the electronic equipment are electromagnetic interference. Every electronic and electric system, equipment creates some signal, which can hinder the normal functioning of another piece of equipment nearby. Not just this, EMI can lessen the functioning of the equipment, lead to operational faults, and even complete failure. Now, Where Does This EMI Comes From? EMI can either be self-generated, due to interference between two circuits in the equipment or created externally by some other equipment or device in the same environment. The earliest form of Electromagnetic Interference (EMI) and radio-frequency interference (RFI) comprised of spurious signals coming from radio transmitters that are disturbed by other radios. For instance, harmonics generate