How to Use CT-14 Bluetooth Amplifier Audio Module: Examples, Pinouts, and Specs

The CT-14 Bluetooth Amplifier Audio Module is a compact and versatile audio amplifier designed for wireless audio streaming. It supports Bluetooth connectivity, enabling seamless audio playback from devices such as smartphones, tablets, and laptops. With its built-in amplifier, the CT-14 can directly drive speakers, making it an excellent choice for DIY audio projects, portable speaker systems, and home audio setups.

• DIY Bluetooth speaker projects
• Home audio systems
• Portable audio amplifiers
• Wireless audio streaming for existing speaker setups
• Educational projects involving audio electronics

The CT-14 Bluetooth Amplifier Audio Module is designed to deliver high-quality audio performance while maintaining ease of use. Below are its key technical specifications:

The CT-14 module features a simple pinout for easy integration into circuits. Below is the pin configuration:

1. Power Supply: Connect the VCC pin to a stable 5V DC power source and the GND pin to ground.
2. Speaker Connection:
   • Connect the left speaker to the L+ and L- pins.
   • Connect the right speaker to the R+ and R- pins.
   • Ensure the speakers have an impedance of 4Ω to 8Ω for optimal performance.
3. Bluetooth Pairing:
   • Power on the module. It will automatically enter pairing mode, indicated by a blinking LED (if present).
   • On your Bluetooth-enabled device, search for available devices and select the CT-14 module (it may appear as "CT-14" or a similar name).
   • Once paired, the LED will stop blinking and remain steady (if applicable).
4. Audio Playback: Play audio from your Bluetooth device. The module will amplify the signal and output it to the connected speakers.

• Use a regulated 5V DC power supply to avoid damage to the module.
• Ensure proper heat dissipation if the module is used at maximum output power for extended periods.
• Avoid shorting the speaker output pins (L+, L-, R+, R-) to prevent damage to the module.
• Keep the module away from sources of electromagnetic interference to maintain stable Bluetooth connectivity.

While the CT-14 does not require an Arduino for basic operation, you can use an Arduino UNO to control its power or integrate it into a larger project. Below is an example of controlling the module's power using a relay:

• Connect the CT-14 module's VCC and GND to the relay's output terminals.
• Connect the relay's control pin to an Arduino digital pin (e.g., pin 7).
• Use a 5V DC power supply to power both the Arduino and the CT-14 module.

// This code demonstrates how to control the CT-14 module's power using a relay.
// The relay is connected to pin 7 of the Arduino.

const int relayPin = 7; // Define the pin connected to the relay

void setup() {
  pinMode(relayPin, OUTPUT); // Set the relay pin as an output
  digitalWrite(relayPin, LOW); // Start with the relay off
}

void loop() {
  // Turn on the CT-14 module
  digitalWrite(relayPin, HIGH);
  delay(10000); // Keep the module on for 10 seconds

  // Turn off the CT-14 module
  digitalWrite(relayPin, LOW);
  delay(5000); // Keep the module off for 5 seconds
}

1. No Audio Output:

   • Ensure the module is powered with a stable 5V DC supply.
   • Verify that the speakers are properly connected to the output pins.
   • Check the Bluetooth connection and ensure the device is paired correctly.

2. Distorted Audio:

   • Ensure the speakers have an impedance of 4Ω to 8Ω.
   • Reduce the volume on the Bluetooth device to prevent overdriving the module.
   • Check for loose or faulty speaker connections.

3. Bluetooth Connection Issues:

   • Ensure the module is in pairing mode (blinking LED, if applicable).
   • Move the Bluetooth device closer to the module to avoid signal interference.
   • Restart the module and the Bluetooth device, then attempt pairing again.

4. Module Overheating:

   • Ensure proper ventilation and avoid enclosing the module in a small, unventilated space.
   • Reduce the output power if the module is used for extended periods.

Q: Can I use a power supply higher than 5V?
A: No, the CT-14 module is designed to operate at 5V DC. Using a higher voltage may damage the module.

Q: What is the maximum range of the Bluetooth connection?
A: The Bluetooth range is typically up to 10 meters in an open environment. Walls and obstacles may reduce the range.

Q: Can I connect headphones to the module?
A: No, the CT-14 is designed to drive speakers, not headphones. Connecting headphones may result in poor audio quality or damage to the module.

Q: Does the module support Bluetooth 5.0?
A: The CT-14 is compatible with Bluetooth 4.2 and higher, so it should work with Bluetooth 5.0 devices.