How to Use DC Male Barrel Jack Power Connector with Wire: Examples, Pinouts, and Specs

The DC Male Barrel Jack Power Connector with Wire is an essential component used to supply power from an external source to electronic devices. It features a cylindrical male plug with a center pin designed to connect securely into a corresponding female barrel jack. This type of connector is widely used in a variety of applications, including powering small consumer electronics, LED lighting systems, and is often used in conjunction with development boards like the Arduino UNO for prototyping and projects.

• Connector Type: DC Male Barrel Jack
• Wire Length: Typically ranges from 6 inches to 6 feet (custom lengths available)
• Wire Gauge: Commonly 22-28 AWG (American Wire Gauge)
• Rated Voltage: Up to 24V DC (depending on model)
• Rated Current: Up to 5A (depending on model)
• Center Pin Polarity: Positive (+)
• Outer Shield Polarity: Negative (-)

1. Identify Polarity: Ensure the polarity of the power supply matches the device's requirements. The center pin is typically positive, while the outer shield is negative.
2. Connect to Power Source: Insert the male barrel jack into the female jack of the power supply, ensuring a snug fit.
3. Wire Integration: Connect the wire leads to the electronic device or circuit board, observing correct polarity. Red wire is usually positive, and black wire is negative.

• Voltage and Current Ratings: Do not exceed the voltage and current ratings of the barrel jack to prevent damage.
• Secure Connections: Ensure all connections are secure to prevent intermittent power supply.
• Strain Relief: Provide strain relief for the wire to prevent mechanical stress on the connections.

• Loose Connections: If the device intermittently loses power, check for a loose connection at the barrel jack or wire terminals.
• Incorrect Polarity: Reversed polarity can cause the device not to function or, worse, damage the device. Always double-check the polarity before powering up.
• Wire Breakage: If the device does not power on, inspect the wire for any signs of breakage or wear.

Q: Can I use this connector with an AC power source? A: No, this connector is designed for DC power sources only.

Q: What happens if I reverse the polarity? A: Reversing the polarity may damage the electronic device. Always ensure correct polarity before connecting.

Q: How can I extend the wire if it's too short? A: You can solder additional wire of the same gauge to the existing wire, ensuring proper insulation and strain relief.

If you're using the DC Male Barrel Jack Power Connector to supply power to an Arduino UNO, here's a simple example to light up an LED when power is connected:

// Define the LED pin
const int LED_PIN = 13; // Most Arduino UNOs have an onboard LED on pin 13

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

void loop() {
  // Turn on the LED when power is connected
  digitalWrite(LED_PIN, HIGH);
  // No need for a delay or additional code, as we're simply indicating power status
}

Remember, the above code assumes that the Arduino UNO is powered correctly through its barrel jack or USB port, and the LED is used as an indicator for power presence.

Note: This documentation is for informational purposes only. Always consult the specific datasheet for the component you are using, as specifications can vary between manufacturers and models.