Transformers, Audio

Radios also contain audio transformers. They contain two coils of wire wound around a metal core. Transformers help move the audio from one stage to the next, and couple the final audio stage to the speaker.

A tapped audio transformer and it's schematic symbol.

They also present the correct impedance to the two circuits they connect. Which is to say, a speaker might work best at 8-ohms while the amplifier circuitry supplying the audio needs 600-ohms.  The transformer presents the appropriate impedances to the devices.

Some transformers have taps, which are additional internal connections to specific points in a coil’s winding.  The illustration above shows a typical tapped audio transformer and its schematic representation.

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