How a Car Radio Works

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Here's a brief overview of how a car's stereo system works.

A car's audio system entertains the occupants inside with music, sound or noise. This audio source can come from various media, such as radio-waves, compact disc, cassette, auxiliary, bluetooth, FM modulator, WiFi, NFC or satellite radio.

In this video, a AM/FM CD stereo head unit is taken apart and its components are examined inside. Each major component is explained as part of the overall function of the head unit, including: the antenna input, tuner, demodulator, micro-controller, communication BUS, equalizer, amplifier, power distribution, LCD and human interface, CD-ROM laser, CD tray, CD circuit control and speaker.

Presented here is a very simplified explanation of how a car's radio works - today's radios are much more complex and feature multiple circuit boards and higher powered computer chips that can process more and give the user more features.

The stereo in this video was a single DIN, AM/FM/CD head-unit from a 2001 Toyota Corolla.

Here's how to hack an aux line on a stereo that didn't come with one:


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