Transformer 220V 9-0-9V (1A)

Specifications

1. Primary Voltage:
   • The primary winding of the transformer is intended to be connected to a mains voltage of 220V AC, which is standard in many countries.
2. Secondary Voltage:
   • The transformer features a center-tapped secondary output, providing two outputs of 9V each (9V and -9V) relative to the center tap (0V). This configuration allows for both positive and negative voltage, which can be useful in various applications requiring dual polarity.
3. Current Rating:
   • The transformer has a maximum output current capacity of 1A. This means it can deliver up to 1 ampere of current from the secondary windings without overheating or damage.
4. Winding Configuration:
   • The transformer consists of three connections on the secondary side: one center tap (0V) and two outer taps (+9V and -9V). This center-tapped design is commonly used for powering op-amps, differential amplifiers, and other circuits requiring dual supply voltages.
5. Core Material:
   • Typically made with a laminated silicon steel core or ferrite core, which helps in reducing core losses and improving efficiency by minimizing energy wasted as heat.
6. Physical Design:
   • The transformer may come in various physical forms, including encapsulated designs for enhanced safety or open-frame designs for easier application in electronic circuits.
7. Isolation:
   • This transformer offers galvanic isolation between the high voltage (primary) and the low voltage (secondary) circuits, which is vital for safety and preventing shock hazards.

Applications

• Audio Amplifiers: Commonly used in audio equipment, these transformers can provide dual supply rails needed for op-amps and audio power amplifiers.
• Power Supplies: Ideal for constructing linear power supplies where both positive and negative voltages are needed.
• Signal Processing Circuits: Often found in circuits that handle differential signals, such as instrumentation amplifiers.
• Hobby Projects: Perfect for electronics enthusiasts and hobbyists working on projects that require 9V AC or dual-polarity power supplies.
• Testing Equipment: Used in test equipment that requires both positive and negative supply voltages for proper operation.

Important Considerations

• Load Limitations: Ensure that the total load connected to any of the 9V outputs does not exceed 1A to avoid overheating and damage to the transformer.
• Thermal Management: Adequate ventilation should be ensured during operation, especially if the transformer is to be used near its maximum current rating for extended periods.
• Voltage Regulation: If precise voltage levels are necessary, consider using additional regulation components, as the output voltage may vary slightly depending on the load.
• Compliance and Safety: Always ensure the transformer complies with local safety regulations and electrical codes when used in built systems or products.

This transformer is a versatile component suitable for a variety of electronic projects and applications requiring reliable dual-output power, making it an essential part of many audio, signal processing, and testing circuits.