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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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Emi filter for audio equipment

EMI Filter for Audio Equipment

By K5PA

March 5, 2014


Problem statement

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


Schematic 1 of 2 channels for stereo

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


Formula for calculating inductance

Formula for Calculating Inductance


Ferrite cores used

Ferrite Cores Used

Ferrite Core Characteristics and Source:

http://www.amidoncorp.com/fb-73-2401/


Bode plot of pi filter in out response

Bode Plot of Pi Filter In/Out Response

Input Amplitude and Phase (Green)

Output Amplitude

Output Phase


Subwoofer emi filter

Subwoofer EMI Filter

  • Much lower frequency response requirement for subwoofer allowed a single pole, RC filter to be used


Bode plot of rc filter in out response

Bode Plot of RC Filter In/Out Response

Input Amplitude and Phase (Green)

Output Amplitude

Output Phase


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