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