• Preface
• Table of Contents
• Index
• References
• Media Response
• Chap. 2 - Resistors
• Chap. 3 - Capacitors
• Chap. 4 - Coils
• Chap. 5 - RC-LC Networks

In every electronic circuit and device, analog and digital, undesired noises, electromagnetic waves and radio frequencies are demonstrated. The filters that suppress all that are called EMI (Electro-Magnetic Interference) RFI (Radio-Frequency Interference).
In Figure below you can see the four ways of broadcasting those noises: 1. though the pipe, 2. through the environment, 3.from the pipe to the environment and 4. from the environment to the pipe. In Fig. 5.18 you can see the basic EMI/RFI way of suppressing.In Greece, as in the rest of the E.U., since 1/1/1997, every electric ore electronic device must have antiparasitic EMI/RFI filters (IEC 1000-4-X/95) and for their certification, they will have the symbol CE (Conformitee Europenne).