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A '''modulation transformer''' is an [[Transformer|audio-frequency transformer]] that forms a major part of most [[Amplitude modulation|AM]] transmitters. The primary winding of a modulation transformer is fed by an audio amplifier that has about 1/2 of the rated input power of the transmitter's final amplifier stage. The secondary winding is in series with the power supply of that final radio-frequency amplifier stage, thereby lowering and raising the operating voltage of the power amplifier (PA) tube or transistor. Considering that the PA device is operated as a [[Electronic_amplifier#Class_C|class-C]] amplifier, i.e. as a switch, the modulation transformer is responsible for the amplitude modulation (AM) of the transmitter.
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