1. Introduction
Thank you for choosing the Nobsound AK2515 VFD Audio Spectrum Analyzer. This device combines an accurate music spectrum analyzer with a high-precision clock display, offering both visual appeal and practical functionality for audio enthusiasts. This manual provides detailed instructions for assembly, operation, maintenance, and troubleshooting to ensure you get the most out of your device.
2. Safety Information
- Ensure the device is powered by a DC 5V source only.
- Do not expose the device to water or excessive moisture.
- Avoid disassembling the main board unless instructed.
- Keep out of reach of children.
3. Packing List
Please check the contents of your package:
- 1 × AK2515 Pro Audio Spectrum Analyzer Board
- 1 × USB Cable (Type-C)
- 1 × 3.5mm Audio Cable
- 1 × 1:2 3.5mm Cable
- 2 × Acrylic Board
- 1 Set × Installation Screws
4. Setup
4.1 Assembly Instructions
For safe shipping, the main board and acrylic boards are packaged separately. Assembly is required and is a straightforward process:
- Carefully remove all components from the packaging.
- Align the two acrylic boards with the main AK2515 Audio Spectrum Analyzer Board.
- Secure the acrylic boards to the main board using the provided installation screws. Ensure all screws are tightened gently to avoid damage.
- Remove any protective film from the acrylic boards for optimal display clarity.
4.2 Connections
- Power Input: Connect the provided USB Type-C cable to the '2* DC 5V IN (Type-C)' port on the back of the device and to a suitable 5V power adapter (not included).
- Audio Input (Wired): Use the 3.5mm audio cable to connect your audio source (e.g., smartphone, computer, audio player) to the '3.5mm AUX input (Low level signal)' port.
- Audio Input (Wireless/MIC): The device features a 'Microphone pickup hole' for ambient sound detection, allowing for wireless audio spectrum analysis.
5. Operating Instructions
5.1 Basic Controls
The device features 'Up', 'Down', and 'OK' buttons for navigation and selection, located on the side of the main board (refer to Figure 4.1).
5.2 Display Modes
The AK2515 supports various display modes, including music spectrum, sound level, and clock display. All settings are saved with a power-off memory function.
Work Modes:
- Auto mode: Displays music spectrum when music is input; switches to clock mode when no music is detected.
- Auto mode without clock display: Displays music spectrum with music input; enters deep sleep mode when no music is detected.
- Music spectrum mode: Always displays the music spectrum.
- Clock display mode: Always displays the clock.
Sound Level Display Modes:
- Normal mode
- Mirror mode 1
- Mirror mode 2
Music Spectrum Modes:
- Normal mode
- Invert color mode
- Reverse mode
- Frequency division mode
- Amplified curve mode
- Real output / Smooth output I / Smooth output II
5.3 Adjustable Items & Effects
The following parameters can be adjusted independently:
- Brightness (7 levels)
- Falling speed of the main light column
- Peak holding time
- Peak falling speed
The device also supports displaying date and time, offers 4 font types, 5 music spectrum display modes, 5 clock display modes, and 3 level modes for free selection.
5.4 Advanced Functions
Frequency Division/Amplification Curve Function and Noise Filtering:
- Frequency Division Modes: 5 modes available to enhance visual effects.
- Amplification Curve Modes: 5 modes to suppress low-frequency or boost high-frequency, adapting to different environments.
- Noise Filtering: A one-click function to improve sound clarity.
5.5 Product Video
6. Maintenance
- Cleaning: Use a soft, dry cloth to clean the acrylic panels and the VFD screen. Avoid abrasive cleaners or solvents.
- Storage: Store the device in a cool, dry place away from direct sunlight and extreme temperatures.
- Handling: Handle the device with care to prevent physical damage, especially to the VFD screen.
7. Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| Device does not power on | No power, faulty cable, or power adapter issue. | Check power connection, try a different USB Type-C cable or 5V power adapter. |
| No spectrum display with wired input | Incorrect audio cable connection, low input signal, or wrong work mode. | Ensure 3.5mm audio cable is fully inserted. Increase volume on audio source. Check if the device is in a music spectrum display mode. |
| No spectrum display with MIC input | No ambient sound, MIC sensitivity too low, or wrong work mode. | Ensure there is sound in the environment. Adjust MIC sensitivity if available in settings. Check if the device is in a music spectrum display mode. |
| Clock is inaccurate | Time not set correctly. | Refer to the operating instructions to set the date and time. The SD3078 crystal oscillator ensures high accuracy once set. |
7.1 User Tips
- Protective Film: Remember to remove the protective film from both sides of the acrylic boards after assembly for the clearest display.
- Optimal Viewing: Experiment with different display modes and adjustable settings (brightness, peak speeds) to find the visual effect that best suits your environment and preferences.
- Audio Source Volume: For wired input, ensure your audio source's volume is at a reasonable level to provide a strong enough signal for the spectrum analyzer to react effectively.
8. Specifications
| Feature | Detail |
|---|---|
| Display Screen | VFD (Vacuum Fluorescent Display) |
| Resolution | 25 × 15 |
| Frequency Range Supported | 20Hz-20KHz |
| Display Items | Music Spectrum / Sound Level / Clock |
| Audio Signal Input | 3.5mm AUX / MIC |
| Work Modes | Auto mode, Auto mode without clock, Music spectrum mode, Clock display mode |
| Sound Level Display Modes | Normal, Mirror 1, Mirror 2 (3 kinds) |
| Amplification Curve Settings | 5 modes (Compressed low-frequency, Compressed low-frequency to enhance high frequency, No enlarging, Slightly compression low frequency to enhances high frequency, Enhance high frequency) |
| Music Spectrum Modes | Normal, Invert color, Reverse, Frequency division, Amplified curve (Real output / Smooth output I / Smooth output II) |
| Adjustable Items | Main light column falling speed, Peak holding time, Peak falling speed |
| Clock Display | Year / Month / Day / Hour / Minute / Second & Date |
| Brightness Adjustment | 7 levels |
| Font Type | 4 kinds |
| Working Voltage | DC 5V |
| Dimensions (W*D*H) | 175*28*50mm / 6.89*1.10*1.97in |
| Net Weight | 189g / 1.42lb |
| Package Weight | 300g / 0.66lb |
9. Warranty and Support
For any questions, technical support, or warranty claims, please contact the seller or manufacturer directly. Please retain your proof of purchase for warranty purposes.
