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Electromagnetic Interference

Many of our electronics are sources of electromagnetic interference (EMI).  

Some EMI travels along wires and into other electrical equipment and is typically in the frequency range of 150 kHz to 30 MHz. 

Some EMI escapes into free space as radiation and is typically of much higher frequencies.

These are some of the common sources of EMI - 

  • Rectifying diodes
  • Switching components
  • High frequency transformers and chokes
  • Circuit layouts (high dv/dt long wires, high di/dt wide loops, high current wires)
  • Mechanical switching/bouncing
  • Chassis design.