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UNIT 10: POWER SUPPLIES AND BATTERIES INTRODUCTION Every electronic device needs power. Power supplies convert wall AC to low-voltage DC. Batteries provide portable DC power. Understanding power is essential for electronics engineers. STORY 1: Linear Power Supplies A linear power supply uses a transformer to lower the voltage, a rectifier to convert to DC, a capacitor to filter, and a regulator to keep the voltage constant. The regulator (like 7805 for 5V) dissipates excess power as heat. L

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