ANENG | 1.8inch Digital Stereo Preamp Controller 0-100 Level Volume Adjust Left Right Balance DC 7-12V For DIY Player Audio Modification

Product Features:1. Equipped with TDA7440D chip, I2C digital control volume level 0-100, no wear and tear switching, no noise2. The high and low frequencies can be adjusted in segments of ± 14dB, and the left and right channels are independently balanced, with stable and delicate tuning accuracy3. One click switching of four stereo audio sources, with built-in fade in and fade out buffering, eliminating popping noise interference throughout the entire switching process4. The tuning parameters support automatic storage when powered off, and do not need to be repeatedly set when turned on. They are displayed in real-time on the ST7735 screen5. Suitable for home amplifier modification, car audio, desktop HiFi devices, multimedia player audio controlProduct OverviewThis module is based on TDA7440D and achieves high-precision audio control through I2C digital interface, replacing traditional analog potentiometer solutions. The TDA7440 digital audio controller is an I2C digital audio processing module based on the semiconductor TDA7440D chip. All parameters are adjusted digitally to completely eliminate the carbon film wear and noise problems of traditional potentiometers.Applicable scenarios: front-end audio processing, desktop audio control, DIY amplifier matching, audio matrix switching. This information package comes with the TDA7440 audio controller hardware module, including a chip data manual, sample code, and complete usage instructions.Main functions:Digital volume control -0~100 levels, no carbon film wear, no noiseBass/treble adjustment - ± 14dB, 2dB per levelLeft and right balance - independent channel attenuation4-way audio source switching - with fade in and fade out transitions to prevent popping soundsParameter power-off memory - automatic saving, power on recoveryST7735 color screen display - real-time status at a glanceCross platform compatibility - supports NANO (AVR) and ESP32Product SpecificationsPower input: DC 7-12VAudio input: 4-channel stereo (RCA/3.5mm)Audio output: 1 stereo channelVolume range: -55dB~+30dBPitch range: ± 14dBChannel separation degree:>90dBTHD+N ：< 0.01%Power consumption:<2WControl Protocol: I2C (Address 0x44)Screen: 1.8-inch ST7735 SPI LCDPower off memory: All parameters (volume, bass, treble, balance, current audio source) are automatically saved after power off. Automatically restore to the previous settings when powered on next time.⚠️ The main control board needs to be purchased by oneself: This module does not include NANO development board or ESP32. Please follow the instructions in [Hardware Specifications] (docs/hardware_stpec.docx) to purchase, and be careful not to buy the wrong model.common problem:Q1: No sound when powered on?Check if the volume is set to 0Check if the audio source is selected correctly (IN1~IN4)Confirm that the audio input cable has been inserted into the corresponding channelQ2: Does the screen value not move during adjustment?The knob needs to be rotated to respond, and the degree of pressure does not affect itConfirm that the corresponding mode has been entered (label turns green)Q3: Is the sound leaning to the left/right?Press the BAL key to enter balance mode and rotate the knob to adjustCenter represents left and right balanceQ4: How to restore factory settings?Press RST key to restore defaultProduct List:1X Digital Audio Controller1X1.8 "display screen