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12V Center-Tapped Step-Down Transformer (220V AC to 12V-0-12V AC) This **step-down transformer** converts **220V AC mains voltage** to a **12V-0-12V AC (center-tapped)** output. It is commonly used in **power supply circuits**, rectifiers, battery chargers, audio amplifiers, and embedded systems to provide a safe, low-voltage AC source. The transformer provides **electrical isolation** between the mains and the output, making it suitable for laboratory experiments, electronics projects, and industrial control applications.