How to Use Power Supply Transformer 230 V to 12 V : Examples, Pinouts, and Specs

The URAQT 200W-12 Power Supply Transformer is a robust and reliable device designed to step down high voltage AC (230 V) to a safer, lower voltage AC (12 V). This transformer is commonly used in electronic circuits to provide a stable power source for low-voltage devices. Its high efficiency and durable construction make it suitable for a wide range of applications, including home appliances, industrial equipment, and DIY electronics projects.

• Powering low-voltage electronic circuits
• LED lighting systems
• Industrial control systems
• DIY electronics and prototyping
• Home automation systems

The following table outlines the key technical details of the URAQT 200W-12 Power Supply Transformer:

The transformer has four terminals for input and output connections. The table below describes each terminal:

Note: The output terminals (3 and 4) provide an alternating current (AC) voltage of 12 V. Polarity is not fixed for AC outputs.

1. Safety First: Ensure the transformer is disconnected from any power source before handling or wiring.
2. Input Connection:
   • Connect the live wire (L) of the 230 V AC power source to the terminal labeled "L."
   • Connect the neutral wire (N) of the 230 V AC power source to the terminal labeled "N."
3. Output Connection:
   • Connect the load (e.g., an electronic circuit or device) to the 12 V AC output terminals (3 and 4).
   • Ensure the load does not exceed the transformer's maximum power output of 200 W.
4. Power On:
   • After verifying all connections, power on the transformer by supplying 230 V AC to the input terminals.
   • Measure the output voltage using a multimeter to confirm it is approximately 12 V AC.

• Overload Protection: Do not exceed the maximum power rating of 200 W to avoid overheating or damage.
• Ventilation: Ensure adequate airflow around the transformer to prevent overheating.
• Grounding: Properly ground the transformer to enhance safety and reduce electrical noise.
• Isolation: Use the transformer in circuits where electrical isolation between the input and output is required.
• AC to DC Conversion: If your application requires DC voltage, use a rectifier circuit and a smoothing capacitor after the transformer's output.

If you need to power an Arduino UNO, you must first convert the 12 V AC output to 12 V DC using a rectifier circuit. Below is an example of how to connect the transformer to an Arduino UNO:

1. Use a bridge rectifier and a smoothing capacitor to convert the 12 V AC output to 12 V DC.
2. Connect the DC output to the Arduino's VIN pin and GND pin.

// Example Arduino code to blink an LED
// Connect an LED to pin 13 with a 220-ohm resistor

void setup() {
  pinMode(13, OUTPUT); // Set pin 13 as an output
}

void loop() {
  digitalWrite(13, HIGH); // Turn the LED on
  delay(1000);            // Wait for 1 second
  digitalWrite(13, LOW);  // Turn the LED off
  delay(1000);            // Wait for 1 second
}

Note: Ensure the rectified DC voltage is within the Arduino's input voltage range (7-12 V recommended).

1. No Output Voltage:

   • Check the input connections to ensure the live and neutral wires are properly connected.
   • Verify that the power source is supplying 230 V AC.
   • Inspect the transformer for visible damage or overheating.

2. Output Voltage Too Low or Too High:

   • Measure the input voltage to confirm it is within the specified range (230 V AC ±10%).
   • Ensure the load connected to the output does not exceed the transformer's power rating.

3. Overheating:

   • Check for proper ventilation around the transformer.
   • Reduce the load if it exceeds the maximum power rating of 200 W.

4. Humming Noise:

   • A slight humming noise is normal due to the magnetic field in the transformer.
   • If the noise is excessive, ensure the transformer is securely mounted and not under excessive load.

Q: Can this transformer be used outdoors?
A: No, the transformer is not weatherproof. Use it in a dry, indoor environment.

Q: Can I use this transformer to power DC devices directly?
A: No, the transformer outputs 12 V AC. You need a rectifier circuit to convert it to DC.

Q: What happens if I connect the output terminals in reverse?
A: Since the output is AC, polarity does not matter. However, ensure proper connections when converting to DC.

Q: Is the transformer compatible with 110 V AC input?
A: No, the transformer is designed for 230 V AC input only. Using 110 V AC will result in reduced output voltage.