For impedance match, we keep N 2 < N 1, i.e. Where V 1 (V 2) is the primary (secondary) voltage, I 1 (I 2) is the primary (secondary) current and N 1 (N 2) is the number of primary (secondary) turns. Then for proper impedance match, for an ideal output transformer, If a load impedance such as a loud speaker is used, then for maximum transfer of power from the amplifier having high output impedance to the low impedance of 5 to 15-ohm of the voice coil of the loudspeaker, it is required to use step down output transformer. Impedance Matching | Transformer Coupled Audio Power Amplifier Figure 1 gives the basic circuit of power amplifier stage using transformers both in the output circuit and the input circuit. Alternatively, the input signal to the transformer coupled power amplifier stage may be fed through RC coupling. Further the input circuit of the transformer coupled amplifier also preferably uses a transformer. Hence it is preferred to couple the load impedance to the amplifier output circuit through a transformer. Further flow of dc current through the output device is not desirable. This dc power dissipated in the load resistor does not contribute to the useful ac output power.
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