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.
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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