220V to 9V AC and 12V-0-12V AC 2A Dual Output Center-Tapped Step-Down Transformer

Product Overview

This 2A step-down power transformer converts a 220V AC mains input into two separate low-voltage AC outputs. The secondary side provides one 0-9V AC output through two wires and one center-tapped 12V-0-12V AC output through three wires, giving a total of five secondary output wires.

The separate secondary windings make the transformer suitable for projects that require both a single 9V AC supply and a symmetrical 12V-0-12V AC supply. After adding suitable rectifier, filtering, and voltage-regulation circuits, the outputs can also be used to build single-rail or positive and negative DC power supplies.

Key Features

• Designed for a 220V AC primary input through two input wires.
• Two independent low-voltage AC secondary outputs.
• Separate 0-9V AC winding with two output wires.
• Center-tapped 12V-0-12V AC winding with three output wires.
• 2A transformer current rating as specified.
• Laminated iron-core construction for conventional mains-frequency power conversion.
• Open-frame chassis-mount design with metal fixing brackets.
• Provides electrical isolation between the primary and secondary windings.
• Suitable for power supplies, amplifiers, control circuits, chargers, and DIY electronics.

Output Configuration

Technical Specifications

Understanding the 12V-0-12V Output

• Each outer 12V wire measures approximately 12V AC relative to the center-tap wire marked 0V.
• The voltage measured between the two outer wires is approximately 24V AC.
• The center tap can be used to build symmetrical positive and negative DC power supplies after suitable rectification and filtering.
• The 9V AC winding is separate and can power another compatible circuit.

Applications

• Dual-polarity regulated power supplies.
• Audio amplifier and preamplifier circuits.
• Analog and operational-amplifier projects.
• Control circuits and industrial electronics.
• Battery-charger circuits with suitable rectification and regulation.
• Microcontroller and embedded-system power supplies.
• DIY electronics and educational projects.
• Circuits requiring both 9V AC and 12V-0-12V AC supplies.

Package Contents

• 1 x 220V to 9V AC and 12V-0-12V AC 2A Step-Down Transformer

Important Notes

• All listed secondary voltages are AC outputs, not DC outputs.
• A bridge rectifier, smoothing capacitors, and suitable regulation components are required when a DC output is needed.
• The 220V primary side is hazardous and must be installed only by a qualified person.
• Use a suitable fuse, insulated enclosure, proper earthing where required, and adequate spacing from low-voltage circuits.
• Never identify the wires only by color. Confirm each winding and voltage using the transformer marking, continuity testing, and a suitable multimeter before connecting a load.
• Do not connect the separate secondary windings together unless the winding arrangement and phase relationship have been correctly verified.