How to Use DC Jack: Examples, Pinouts, and Specs

The DC Jack (Manufacturer: Lcal, Part ID: DC JACK) is a type of electrical connector designed to supply direct current (DC) power to electronic devices. It features a cylindrical socket that mates with a compatible plug, enabling a secure and reliable connection for power delivery. DC Jacks are widely used in consumer electronics, such as laptops, routers, and small appliances, due to their ease of use and durability.

• Powering laptops, routers, and other portable devices
• Supplying DC power to development boards like Arduino and Raspberry Pi
• Used in DIY electronics projects for easy power connections
• Replacing damaged power connectors in electronic devices

The following table outlines the key technical details of the Lcal DC JACK:

The DC Jack typically has three pins, as described in the table below:

1. Mounting the DC Jack:
   • For through-hole versions, solder the pins to a PCB.
   • For panel-mount versions, secure the jack to the enclosure using the provided nut or screws.
2. Connecting Power:
   • Ensure the power supply matches the voltage and current requirements of your circuit.
   • Connect the positive terminal of the power source to the Positive (V+) pin.
   • Connect the negative terminal (ground) to the Negative (V-) pin.
3. Optional Switch Pin:
   • Use the switch pin to detect when a plug is inserted or to toggle between power sources (e.g., battery and external power).

• Polarity: Always verify the polarity of the DC plug and ensure it matches the device's requirements. Reversed polarity can damage components.
• Voltage and Current Ratings: Do not exceed the voltage and current ratings of the DC Jack to avoid overheating or failure.
• Secure Connections: Ensure the plug fits snugly into the jack to prevent intermittent connections.
• Strain Relief: Use strain relief mechanisms to protect the jack from mechanical stress, especially in portable devices.

The DC Jack can be used to power an Arduino UNO by connecting it to a 9V or 12V DC power supply. Below is an example of how to wire the DC Jack and a simple Arduino sketch to blink an LED:

1. Connect the Positive (V+) pin of the DC Jack to the Arduino's VIN pin.
2. Connect the Negative (V-) pin of the DC Jack to the Arduino's GND pin.

// Simple LED Blink Example
// This code blinks an LED connected to pin 13 of the Arduino UNO.

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
}

1. Loose Connection:

   • Issue: The plug does not fit securely into the jack, causing intermittent power.
   • Solution: Ensure the plug matches the jack's dimensions (e.g., 5.5mm OD, 2.1mm ID). Replace the jack if it is damaged.

2. No Power Output:

   • Issue: The device does not power on when connected to the DC Jack.
   • Solution: Verify the polarity and voltage of the power supply. Check for proper soldering or wiring.

3. Overheating:

   • Issue: The DC Jack becomes excessively hot during operation.
   • Solution: Ensure the current does not exceed the jack's 5A rating. Use a power supply with appropriate ratings.

4. Switch Pin Not Working:

   • Issue: The switch pin does not detect plug insertion.
   • Solution: Verify the wiring of the switch pin and ensure it is connected to the correct circuit.

Q1: Can I use the DC Jack with a 5V power supply?
A1: Yes, as long as the current does not exceed 5A and the device is designed to operate at 5V.

Q2: What type of plug is compatible with this DC Jack?
A2: A plug with a 5.5mm outer diameter (OD) and 2.1mm inner diameter (ID) is compatible.

Q3: Can the DC Jack be used for AC power?
A3: No, the DC Jack is designed specifically for direct current (DC) power and should not be used with AC power sources.

Q4: How do I know if the jack is damaged?
A4: Signs of damage include loose connections, visible cracks, or overheating during normal operation. Replace the jack if any of these issues occur.