8002A Audio Amplifier Module

Product Iamge

Introduction

---

        The 8002A audio amplifier module is a high-performance mono Class D amplifier module that supports a wide voltage supply (2.5-5.5V) and delivers a maximum output power of 3W (THD<10%). It features built-in adaptive filtering technology and overcurrent protection circuitry, with a total harmonic distortion of ≤0.3% and a signal-to-noise ratio of ≥90dB. It is suitable for portable devices such as Bluetooth speakers and smart home products.

Schematics

Click to view schematics

ESP32 DAC Reference materials

Digital To Analog Converter (DAC) - ESP32 - — ESP-IDF Programming Guide v5.5.3 documentation

The DAC only supports an 8-bit digital-to-analog converter, mapping digital values from 0 to 255 to an analog voltage ranging from 0 to Vref; The ESP32 has only two DAC channels, located on GPIO25 (Channel 1) and GPIO26 (Channel 2);
They cannot be used concurrently with I2S.

Click Here Download Example

8002A AMP Speaker Module	ESP32
G	G
V	3.3V
S	GPIO25 or GPIO26

After burning the example program onto the ESP32 development board, you can hear the custom audio being played.

How to convert the encoding?

1. Install FFmpeg. click to download the corresponding version.

2. Configure the FFmpeg environment variables, and then execute the following command in the CMD command line:

   ffmpeg -y -i input.mp3 -acodec pcm_s16le -f s16le -ac 1 -ar 16000 output.pcm
   

   Parameter breakdown:

 a. -y

* Automatically overwrite output files without confirmation.

b. -i input.mp3

* Specifies the input file as `input.mp3`.

c. -acodec pcm_s16le

* Sets the audio codec to PCM 16-bit signed integer.

* `s16le` = signed 16-bit little-endian.

d. -f s16le

* Forces the output format to be raw PCM (without a file header).

* Consistent with the codec, ensuring output of pure audio data streams.

e. -ac 1

* Sets the number of audio channels to 1 (mono).

* If the input is stereo, it will be downmixed to mono.

f. -ar 16000

* Sets the audio sampling rate to 16000Hz (16kHz).

g. output.pcm

* Output filename.

3. Convert the output output.pcm file into a C language format header file. It is recommended to use the xxd dump tool. Command:

   xxd -i -C ./output.pcm pcm.h
   

4. Open the generated pcm.h file, replace the variable names in pcm.h with kPcmData, save the file, and replace the pcm.h in the example.Upload a case and you can play a customized audio file.