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from Instructables.com

Make your own Boombox

This boombox is made out of a car radio, salvaged speakers, and two 12V lead acid batteries. Plays for 9 hours continuously!

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2. Charging System This is the heart of the electrical system. It consists of three main components: the belt-driven alternator, various electrical circuits, and a voltage regulator. The alternator supplies power to the electrical system and recharges the battery after your car has started. Just like it sounds, the voltage regulator controls the voltage, keeping it within the operating range of the electrical system.

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