Semi-finishedproduct : No
Data Record : No
High-concerned chemical : none
Electronic : No
Material : Plastic
Size : Audio Amplifier Board
Type : Audio Amplifier Board
Model Number : Audio Amplifier Board
DIY Supplies : Electrical
Brand Name : Aideepen
Origin : Mainland China
Output Voltage : Audio Amplifier Board
Style : Audio Amplifier Board
Certification : NONE
Features:
1. Equipped with the TDA7440D chip, featuring I2C digital volume control with 0–100-level seamless switching and no noise
2. Treble and bass can be adjusted in ±14dB increments; independent left and right channel balance for stable and precise tuning
3. One-touch switching between four stereo audio sources, with built-in fade-in/fade-out buffering to eliminate pop noises during the entire switching process
4. Audio tuning parameters are automatically saved when power is turned off, eliminating the need to reconfigure settings upon startup; features real-time display via an ST7735 screen
5. Suitable for audio control in home amplifier modifications, car audio systems, desktop Hi-Fi equipment, and multimedia players
Product Overview
This module is centered around the TDA7440D and achieves high-precision audio control via an I²C digital interface, replacing traditional analog potentiometer solutions. The TDA7440 Digital Audio Controller is an I²C digital audio processing module based on the TDA7440D semiconductor chip. All parameters are adjusted digitally, completely eliminating the carbon film wear and noise issues associated with traditional potentiometers.
Applications: Preamp audio processing, desktop audio control, DIY power amplifier systems, and audio matrix switching. This documentation package accompanies the TDA7440 audio controller hardware module and includes the chip data sheet, sample code, and complete user instructions.
Key Features:
Digital Volume Control — 0–100 levels, no carbon film wear, no noise
Bass/Treble Adjustment — ±14 dB, 2 dB per step
Left/Right Balance — Independent channel attenuation
4-Channel Source Switching — With fade-in/fade-out transitions to prevent sudden volume spikes
Power-Off Parameter Retention — Automatically saved and restored upon power-up
ST7735 Color Display — Real-time status at a glance
Cross-platform Compatibility — Supports NANO (AVR) and ESP32
Product Specifications:
Power Input: DC 7–12V
Audio Input: 4-channel stereo (RCA / 3.5mm)
Audio Output: 1-channel stereo
Volume Range: -55dB to +30dB
Tone Range: ±14dB
Channel Separation: > 90dB
THD+N: < 0.01%
Power Consumption: < 2W
Control Protocol: I2C (Address 0x44)
Display: 1.8-inch ST7735 SPI LCD
Power-Off Memory: All parameters (volume, bass, treble, balance, current audio source) are automatically saved after power-off. The device automatically restores the previous settings upon the next power-up.
️ You must purchase the main control board separately: This module does not include a NANO development board or ESP32. Please purchase one according to the instructions in [Hardware Specifications](docs/hardware_spec.docx). Be careful not to purchase the wrong model.
Frequently Asked Questions:
Q1: No sound when powered on?
Check if the volume is set to 0.
Check if the correct audio source is selected (IN1–IN4).
Confirm that the audio input cable is plugged into the corresponding channel.
Q2: The screen values don’t change when adjusting settings?
The knob must be rotated to respond; the pressure applied does not affect it.
Confirm that you have entered the corresponding mode (the label turns green)
Q3: Is the sound偏左/偏右?
Press the BAL button to enter balance mode, then rotate the knob to adjust
CENTER indicates left-right balance
Q4: How do I restore factory settings?
Press the RST button to restore defaults
Product List:
1x Digital Audio Controller
1x 1.8" Display
label:yes
Возврат по недоставке
