GODIYMODULES HiFi DAC Audio Sound Card Module PCM5122 I2S Interface

1. Introduction

This GODIYMODULES HiFi DAC expansion board is specifically designed for Raspberry Pi B+ and Raspberry Pi 2 Model B. It integrates the PCM5122 DAC chip and utilizes an I2S interface to deliver high-fidelity audio. This module allows users to construct a custom HIFI audio player using compatible systems such as Volumio or XBMC.

The board features two distinct audio output interfaces for connection to external amplifiers and other audio equipment. It also includes LED indicators for operational status: a red LED indicates power is supplied, and a green LED illuminates when the DAC is actively decoding audio. An infrared receiver interface, occupying GPIO26, is also provided for remote control capabilities.

Figure 1: Angled top view of the GODIYMODULES HiFi DAC Audio Sound Card Module, showing RCA and 3.5mm outputs, and various components.

2. Product Features

• Designed for Raspberry Pi B+ and Raspberry Pi 2 Model B.
• Integrates PCM5122 DAC chip with I2S interface.
• Supports audio playback systems like Volumio and XBMC for HIFI player construction.
• Provides two types of output interfaces for external amplifiers.
• Features LED indicators: Red for power, Green for active decoding status.
• Includes an infrared receiver interface (GPIO26).
• Sampling Frequency: Up to 384KHz.
• Resolution: 16-32 Bits.
• Digital Audio Interface: I2S.
• Signal-to-Noise Ratio (SNR): 120dB.
• Total Harmonic Distortion (THD): -93dB.
• Dynamic Range: 112dB.

3. Setup and Installation

Follow these steps to properly install the HiFi DAC module onto your Raspberry Pi:

1. Power Off Raspberry Pi: Ensure your Raspberry Pi is completely powered off and disconnected from its power source before beginning installation.
2. Align GPIO Pins: Carefully align the 40-pin connector on the DAC module with the GPIO header pins on your Raspberry Pi. Ensure all pins are correctly aligned to prevent damage.
3. Mount the Module: Gently press the DAC module onto the Raspberry Pi's GPIO header until it is securely seated. Avoid excessive force.
4. Connect Audio Outputs: Connect your amplifier or audio system to the DAC module using either the RCA output jacks or the 3.5mm headphone jack.
5. Power On: Reconnect the power supply to your Raspberry Pi. The red LED on the DAC module should illuminate, indicating power.
6. Software Configuration: Access your Raspberry Pi's operating system (e.g., Raspbian, Volumio). You will need to enable the I2S audio interface and select the appropriate DAC driver (often listed as PCM5122, HiFiBerry DAC+, or similar) in your system's audio settings or configuration files. Refer to your specific operating system's documentation for detailed instructions on enabling I2S audio.

Figure 2: Top view of the DAC module, highlighting the RCA and 3.5mm output ports, and the 40-pin connector for Raspberry Pi.

4. Operating Instructions

Once the DAC module is physically installed and software configured, it is ready for operation:

• Power Indicator: The red LED on the board indicates that the module is receiving power. If this LED is not lit, check your Raspberry Pi's power supply and the module's connection.
• Working Status Indicator: The green LED will illuminate when the DAC is actively processing and decoding audio data. If this LED remains off during audio playback, verify your software configuration and audio source.
• Audio Playback: Use your chosen audio playback software (e.g., Volumio, XBMC, MPD) on the Raspberry Pi to play audio files. Sound will be output through the connected RCA or 3.5mm jacks.
• Infrared Receiver: If you intend to use an infrared remote control, ensure your software supports the infrared receiver connected to GPIO26 and configure it accordingly.

5. Maintenance

To ensure the longevity and optimal performance of your HiFi DAC module, observe the following maintenance guidelines:

• Keep Dry: Protect the module from moisture and liquids. Exposure to water can cause damage.
• Clean Gently: If cleaning is necessary, use a soft, dry, anti-static cloth. Do not use harsh chemicals or abrasive materials.
• Avoid Static Discharge: Handle the module by its edges and avoid touching the electronic components directly, especially in dry environments where static electricity is prevalent.
• Operating Environment: Use the module in a well-ventilated area and within its specified operating temperature range.

6. Troubleshooting

If you encounter issues with your HiFi DAC module, consider the following troubleshooting steps:

• No Sound Output:
  • Verify all physical connections between the DAC module, Raspberry Pi, and audio system.
  • Check that the red power LED on the DAC module is illuminated.
  • Confirm that the I2S interface is enabled and the correct DAC driver is selected in your Raspberry Pi's operating system settings.
  • Ensure the volume is not muted or set too low in your software or on your amplifier.
• Distorted or Poor Quality Audio:
  • Check for loose connections.
  • Ensure your Raspberry Pi's power supply is stable and sufficient.
  • Verify that the audio sample rate and bit depth settings in your software match the capabilities of the DAC module.
  • Test with different audio files or sources.
• Green LED Not Lighting During Playback:
  • This indicates the DAC is not receiving or processing audio data. Recheck software configuration for I2S and DAC driver selection.
  • Ensure audio is actively playing from your Raspberry Pi.
• Module Not Recognized by Raspberry Pi:
  • Ensure the module is correctly seated on the GPIO pins.
  • Verify that your Raspberry Pi model is compatible (Raspberry Pi B+, Raspberry Pi 2 Model B).
  • Check for any physical damage to the module or Raspberry Pi GPIO pins.

7. Specifications

8. Package Contents

The package includes:

• 1 x GODIYMODULES HiFi DAC Audio Sound Card Module (PCM5122 I2S Interface)

Figure 3: Bottom view of the DAC module, showing solder points and board markings.

9. Warranty Information

This product is covered by the standard manufacturer's warranty provided by GODIYMODULES. Please retain your proof of purchase for any warranty claims. For specific details regarding warranty duration and terms, refer to the documentation provided at the time of purchase or contact the manufacturer directly.

10. Customer Support

For technical assistance, troubleshooting, or inquiries regarding the GODIYMODULES HiFi DAC Audio Sound Card Module, please contact GODIYMODULES customer support through their official website or the retailer from whom the product was purchased. Please have your product model and purchase details ready when contacting support.