Description
The MAX98357A I2S 3W Digital Audio Amplifier Module is a compact, all-in-one Class D amplifier that takes a digital I2S audio signal directly from your microcontroller and drives a speaker โ no DAC, no analog circuitry, no extra components needed. Built around the Maxim MAX98357A chip, this module delivers up to 3 watts of clean audio output with up to 92% efficiency, making it perfect for smart speaker builds, audio alert systems, and voice output projects with ESP32 and Raspberry Pi.
Pair it with the INMP441 I2S microphone and an ESP32 to build a complete digital audio pipeline โ capture voice, process it, and play back sound all in the digital domain without any analog noise. Available in Bangladesh at the best price from Dream RC.
โญ Key Features
I2S Digital Input
Takes digital I2S audio directly โ no DAC or analog conversion
3W Class D Output
Drives 4ฮฉ or 8ฮฉ speakers directly โ no additional amp needed
92% Efficiency
Class D amplification โ minimal heat, ideal for battery projects
Ultra Compact
Tiny module โ fits inside enclosures alongside ESP32 and a speaker
2.7V โ 5.5V Supply
Powers from 3.3V or 5V โ compatible with most dev boards
No External Components
All filtering built-in โ just connect power, I2S, and a speaker
๐ What Can You Build With the MAX98357A?
๐
DIY Smart Speaker
Build Alexa-style speakers with ESP32
๐ฃ๏ธ
Voice Output Systems
Play audio alerts, TTS and announcements
๐ต
IoT Audio Player
Stream audio from WiFi with ESP32 + I2S
๐ค
Robot Speech Output
Give your robot a voice with ESP32 TTS
๐จ
Alert & Notification
Audio alerts for sensor triggers and alarms
๐ค Who Should Buy This?
๐ Beginners
Adding sound output to an ESP32 project โ just connect 3 wires and the Adafruit I2S library handles the rest
๐ Students
Audio DSP projects, smart speaker university builds, and voice-assisted IoT system assignments
โ๏ธ Engineers
Embedded audio product development needing clean, efficient digital amplification without analog PCB traces
๐ ๏ธ Hobbyists
Makers building Bluetooth speakers, internet radio, voice-activated gadgets or robot voice systems
โ๏ธ MAX98357A vs PAM8403 vs LM386 โ Which Audio Amplifier Should You Use?
A practical comparison of popular audio amplifier modules for maker projects
| Feature | THIS ITEM MAX98357A I2S Digital Amp | ANALOG PAM8403 3W Stereo Amp | CLASSIC LM386 Analog IC |
|---|---|---|---|
| Input Type | I2S Digital | Analog | Analog |
| Max Power | 3W mono | 3W + 3W stereo | 0.5W mono |
| Noise Level | Very low โ digital path | Moderate analog noise | Higher noise floor |
| ESP32 Direct | โ I2S โ perfect fit | Needs DAC output pin | Needs DAC output pin |
| Best For | ESP32 smart speaker, voice output | Stereo audio from analog source | Simple audio on breadboard |
๐ง Features & Specifications
๐ Wiring (ESP32) & Quick Start
MAX98357A Play Tone Example (ESP32)
#include <driver/i2s.h> #define I2S_BCK 14 #define I2S_WS 15 #define I2S_DOUT 22 void setup() { i2s_config_t cfg = { .mode = (i2s_mode_t)(I2S_MODE_MASTER | I2S_MODE_TX), .sample_rate = 44100, .bits_per_sample = I2S_BITS_PER_SAMPLE_16BIT, .channel_format = I2S_CHANNEL_FMT_RIGHT_LEFT, .communication_format = I2S_COMM_FORMAT_STAND_I2S, .intr_alloc_flags = 0, .dma_buf_count = 8, .dma_buf_len = 64 }; i2s_driver_install(I2S_NUM_0, &cfg, 0, NULL); i2s_pin_config_t pins = { .bck_io_num = I2S_BCK, .ws_io_num = I2S_WS, .data_out_num = I2S_DOUT, .data_in_num = I2S_PIN_NO_CHANGE }; i2s_set_pin(I2S_NUM_0, &pins); } void loop() { int16_t sample[64]; for(int i=0; i<64; i++) sample[i] = sin(2*PI*440*i/44100.0) * 10000; size_t written; i2s_write(I2S_NUM_0, sample, sizeof(sample), &written, 100); }
For full audio playback from SD card or SPIFFS, use the ESP8266Audio or esp32-audioI2S library.
โ Frequently Asked Questions
๐ Complete Your Audio System โ Add a Microphone
INMP441 Omnidirectional I2S Microphone Module
The ideal input partner โ the INMP441 I2S microphone captures crystal-clear digital audio. Pair it with the MAX98357A and ESP32 to build a complete two-way digital audio system with no analog components.
MAX9814 Microphone AGC Amplifier Module
Prefer analog input? The MAX9814 with automatic gain control provides a clean analog audio signal. Pair it with ESP32’s DAC + MAX98357A for a complete analog-input, digital-output audio chain.
๐ฆ Package Includes
1 ร MAX98357A I2S 3W Class D Digital Audio Amplifier Module
Speaker and jumper wires not included
๐ฌ MAX98357A Price in BD & Why Buy From Dream RC?
The MAX98357A I2S 3W Audio Amplifier Module price in BD is 389 BDT. Buy the MAX98357A digital amplifier in Bangladesh from Dream RC โ your trusted source for audio modules and IoT components at the best price with fast delivery and Cash on Delivery nationwide.
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