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EMI Filter for Audio Equipment

EMI Filter for Audio Equipment. By K5PA March 5, 2014. Problem Statement. During amateur radio transmission, our audio equipment would pick up the transmission, especially during CW operations

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EMI Filter for Audio Equipment

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  1. EMI Filter for Audio Equipment By K5PA March 5, 2014

  2. Problem Statement • During amateur radio transmission, our audio equipment would pick up the transmission, especially during CW operations • Design and installation of simple RC and pi (C-L-C) network filters in the input of the stereo equipment solved the problem

  3. Schematic (1 of 2 Channels for Stereo) SPICE Model Created Using Ltspice IV L2 Uses Amidon Core, Type FB-73-2401, AL=2500, 35 turns of magnet wire, approximate inductance calculated is 3 mH

  4. Formula for Calculating Inductance

  5. Ferrite Cores Used Ferrite Core Characteristics and Source: http://www.amidoncorp.com/fb-73-2401/

  6. Bode Plot of Pi Filter In/Out Response Input Amplitude and Phase (Green) Output Amplitude Output Phase

  7. Subwoofer EMI Filter • Much lower frequency response requirement for subwoofer allowed a single pole, RC filter to be used

  8. Bode Plot of RC Filter In/Out Response Input Amplitude and Phase (Green) Output Amplitude Output Phase

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