Description
Ready-to-Use MAX98357 I2S Class-D Mono Audio Amplifier Module with Soldered Headers for ESP32, Raspberry Pi, Voice & Smart Speaker Projects
The MAX98357 I2S Digital Audio Amplifier Module – Soldered Version is a compact digital audio amplifier board designed for ESP32, Raspberry Pi, smart speaker, voice assistant, IoT audio, text-to-speech and embedded sound projects.
Unlike analog amplifier modules, the MAX98357 receives digital I2S audio through BCLK, LRC/WS and DIN signals and directly drives a speaker through its built-in Class-D amplifier.
এই MAX98357 I2S Audio Amplifier Module ESP32, Raspberry Pi, voice assistant, text-to-speech, smart speaker এবং embedded audio project-এর জন্য ব্যবহার করা যায়। এটি analog audio নয়, বরং I2S digital audio signal গ্রহণ করে এবং সরাসরি speaker drive করতে পারে।
This listing is for the soldered version, so the pin header and speaker terminal are already assembled and ready for connection.
Product Highlights / প্রধান বৈশিষ্ট্য
✅ Based on MAX98357 / MAX98357A compatible IC
✅ Digital I2S audio input
✅ Built-in Class-D mono amplifier
✅ No separate DAC required
✅ Suitable for ESP32 and Raspberry Pi
✅ Purple PCB large-chip version
✅ Header pins already soldered
✅ Speaker screw terminal already soldered
✅ Ready for jumper-wire connection
✅ Supports BCLK, LRC/WS and DIN
✅ Gain control support
✅ Shutdown / enable control support
✅ No MCLK required in typical applications
✅ Ideal for voice, audio playback and smart speaker projects
Applications / ব্যবহার ক্ষেত্র
• ESP32 text-to-speech project
• ESP32 voice assistant
• Smart speaker project
• Internet radio
• Raspberry Pi audio output
• Voice notification system
• Digital alarm / announcement system
• MP3 / WAV playback project
• Talking robot
• IoT audio device
• Embedded sound system
• Digital doorbell
• Voice prompt system
• Educational audio project
Package Includes / প্যাকেজে যা থাকছে
✅ 1 × MAX98357 I2S Digital Audio Amplifier Module – Soldered Version
Included on the board:
✅ Soldered pin headers
✅ Soldered speaker screw terminal
⚠️ Speaker, ESP32, Raspberry Pi, jumper wires and power supply are not included unless mentioned separately.
Technical Specifications / স্পেসিফিকেশন
• Product Type: I2S Digital Audio Amplifier Module
• Main IC: MAX98357 / compatible
• Amplifier Type: Class-D Mono Amplifier
• Audio Input: Digital I2S
• Output: Mono speaker output
• Operating Voltage: Approx. 2.5V–5.5V DC
• Recommended Supply: 3.3V–5V depending on application
• Maximum Output Power: Up to approximately 3W class depending on supply voltage and speaker impedance
• Speaker Support: Commonly 4Ω / 8Ω
• Digital Signals: BCLK, LRC/WS, DIN
• MCLK: Not normally required
• GAIN Pin: Available
• SD Pin: Shutdown / enable
• PCB Color: Purple
• Version: Large Chip / Soldered Version
• Speaker Connection: Soldered screw terminal
• Header Pins: Already soldered
• Recommended Controllers: ESP32, Raspberry Pi, compatible I2S-enabled MCU
Pin Description / পিন পরিচিতি
Typical pins include:
• VIN / VCC – Power input
• GND – Ground
• BCLK / BCK – I2S bit clock
• LRC / LRCLK / WS – Word select / left-right clock
• DIN – Digital audio data input
• GAIN – Gain configuration
• SD – Shutdown / enable
• SPK+ / OUT+ – Speaker positive
• SPK− / OUT− – Speaker negative
⚠️ Always follow the labels printed on the actual module because pin arrangement may vary slightly between board versions.
How It Works / কীভাবে কাজ করে
The microcontroller sends digital audio to the module using I2S.
The module performs:
I2S Digital Audio → Internal Conversion → Class-D Amplification → Speaker Output
This means you usually do not need a separate DAC or audio amplifier stage.
এই module digital audio signal internally process করে speaker drive করার মতো amplified output তৈরি করে।
Basic ESP32 Connection
Example connection:
• VIN → ESP32 5V / suitable supply
• GND → ESP32 GND
• BCLK → Selected ESP32 I2S BCLK GPIO
• LRC / WS → Selected ESP32 I2S WS GPIO
• DIN → Selected ESP32 I2S DATA OUT GPIO
• Speaker → SPK+ and SPK−
Example GPIO assignment:
• BCLK → GPIO 26
• LRC / WS → GPIO 25
• DIN → GPIO 22
⚠️ GPIO assignments can be changed in software.
Important Speaker Connection Note
The speaker output is differential / bridge-tied Class-D output.
Connect:
Speaker → SPK+ and SPK−
⚠️ Do not connect SPK− directly to GND.
Suitable Speakers
Common small speakers include:
• 4Ω 3W speaker
• 8Ω mini speaker
• Small enclosure speaker
• DIY smart speaker driver
Actual volume depends on:
• Supply voltage
• Speaker impedance
• Gain configuration
• Speaker efficiency
• Audio source level
• Enclosure design
Why Choose the Soldered Version?
The soldered version is more convenient because:
✅ No header soldering needed
✅ No terminal soldering needed
✅ Faster project setup
✅ Easier breadboard/jumper-wire connection
✅ Better for beginners
✅ Ready to connect immediately
এই version-এ header pin এবং terminal আগে থেকেই soldered থাকে, তাই extra soldering ছাড়াই সরাসরি project-এ ব্যবহার করা যায়।
Important Notes / গুরুত্বপূর্ণ নোট
⚠️ This is an I2S digital amplifier, not an analog AUX amplifier.
⚠️ 3.5mm analog audio cannot be connected directly to DIN.
⚠️ Use suitable DC supply voltage.
⚠️ Do not connect SPK− to GND.
⚠️ Controller and module must share common GND.
⚠️ Avoid reverse polarity.
⚠️ Use suitable speaker impedance and power rating.
⚠️ High output volume may require a stable 5V supply.
⚠️ PCB layout and terminal color may vary slightly by stock batch.
⚠️ This listing is specifically for the soldered version.
Frequently Asked Questions / FAQ
Is this version soldered?
Yes. The pin headers and speaker screw terminal are already soldered.
Can I use it directly after receiving?
Yes. It is ready for connection with jumper wires and a suitable speaker.
Can I use it with ESP32?
Yes. ESP32 is one of the most common controllers used with this module.
Does it need an external DAC?
No. The module handles digital audio conversion internally.
Can it drive a speaker directly?
Yes, it can directly drive a suitable small 4Ω or 8Ω speaker.
Can I connect AUX / 3.5mm audio?
No. It requires digital I2S audio input.
Does it need MCLK?
Normally no.
MAX98357 I2S Audio Amplifier Module Soldered Version for ESP32
Buy MAX98357 I2S digital audio amplifier module soldered purple board for ESP32, Raspberry Pi, voice assistant, smart speaker, audio playback and IoT projects.
