Audio Frequency Transformer


  • The audio frequency transformer works in the frequency range of 20 Hz to 20 kHz. They are used in the audio amplifiers. 
  • They are essential in the impedance matching. i.e. matching high impedance output of amplifier to the low impedance of loud speaker.

  • Figure ( a ) shows center taped secondary winding to provide two anti phase signals. 
  • The dot near the winding indicates relative polarity of the signal on different windings. 
  • The dot at point P shows secondary winding signal is in phase with primary winding signal whereas the dot at point Q indicates secondary winding signal is antiphase with primary winding signal. 
  • Figure ( b ) shows two audio amplifier is used to couple the power output stage of an audio amplifier to the loud speaker.

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Function of audio amplifier

  • They allow only AC audio signal to the loud speaker whereas preventing DC from the amplifier.
  • They provide isolated external connection for the loud speakers.
  • They provide impedance matching between low input impedance of loud speaker to higher output impedance of an amplifier. 
  • It will allow maximum power transfer from the amplifier to speaker.

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