Where used, they allow the AC audio signal to reach the loudspeaker whilst preventing any DC from the amplifier affecting the operation of the loudspeaker.The dots near the windings on schematic diagrams indicate the relative polarity of the signals on different windings, and in this example show that the signal from the upper secondary winding (A) will be in phase with the primary signal, while the lower secondary winding (B) will provide a signal in anti phase with the primary signal.Įxample b.) shows two output transformers, used to couple the power output stage of an audio amplifier to the loudspeaker.Īudio transformers often perform several functions at once: In audio amplifiers, the phase/anti phase of signals can be important and phase splitting transformers with centre tapped secondary windings can be used to provide two anti phase signals. Some transformers may also have tapped primaries for an even wider range of ratios. Some common arrangements of audio transformer windings are shown in Fig 11.4.2.Įxample a.) shows a centre tapped secondary winding that can be used to provide a selection of different turns ratios. Fig 11.4.2 AF transformer schematic diagrams showing phase indicators.
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