Aideepen | TDA7440D Digital Audio Preamp Module DC7-12V Stereo Input I2C Noise-free Volume Treble Bass Balance 1.8" ST7735 LCD For DIY HiFi

Features:1. Equipped with the TDA7440D chip, featuring I²C digital volume control with 0–100-level wear-free switching and no noise2. Treble and bass can be adjusted in ±14 dB steps; independent left and right channel balance; stable and precise sound tuning3. One-touch switching between four stereo audio sources, with built-in fade-in/fade-out buffering to eliminate pop noises throughout the switching process4. Audio settings are automatically saved upon power-off, eliminating the need for re-configuration upon power-up; features real-time display via an ST7735 screen5. Suitable for audio control in home amplifier modifications, car audio systems, desktop Hi-Fi equipment and multimedia playersProduct OverviewThis module utilises the TDA7440D as its core, achieving high-precision audio control via an I²C digital interface, thereby replacing traditional analogue 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 issues of carbon film wear and noise associated with traditional potentiometers.Suitable Applications: Pre-amplifier 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, example code and comprehensive user instructions.Key Features:Digital volume control — 0–100 levels, no carbon film wear, no noiseBass/treble adjustment — ±14dB, 2dB per stepLeft-right balance — Independent channel attenuation4-channel source switching — With fade-in/fade-out transitions, eliminating sudden volume spikesPower-off parameter retention — Automatically saved and restored upon power-upST7735 colour display — real-time status at a glanceCross-platform compatibility — supports NANO (AVR) and ESP32Product Specifications:Power supply: DC 7–12 VAudio input: 4-channel stereo (RCA / 3.5 mm)Audio Output: 1-channel stereoVolume Range: -55dB to +30dBTone Range: ±14dBChannel Separation: > 90dBTHD+N: < 0.01%Power Consumption: < 2WControl Protocol: I2C (Address 0x44)Display: 1.8-inch ST7735 SPI LCDPower-off memory: All parameters (volume, bass, treble, balance, current audio source) are automatically saved upon power-off. The settings are automatically restored to their previous state upon the next power-up.⚠️ The main control board must be purchased separately: This module does not include a NANO development board or ESP32. Please purchase one according to the guidelines in Hardware Specifications, taking care not to select the wrong model.Frequently Asked Questions:Q1: No sound when powered on?Check whether the volume is set to 0Check whether the correct audio source is selected (IN1–IN4)Ensure the audio input cable is plugged into the corresponding channelQ2: The display value does not change when adjusting settings?The knob must be turned to respond; the pressure applied does not affect itEnsure you have entered the corresponding mode (the label turns green)Q3: Is the sound biased to the left or right?Press the BAL button to enter balance mode, then turn the knob to adjustCENTER indicates balanced left and rightQ4: How do I restore factory settings?Press the RST button to restore defaultsProduct List:1x Digital Audio Controller1x 1.8" display