SPECIFICATIONS

This amplifier takes digital audio directly through the I2S interface, converts it to PWM inside the chip, and drives the speaker with Class D efficiency. The signal never leaves the digital domain, so you get pristine audio free from analog noise and interference.

Points

●Filterless Class D Amplifier: Powered by MAX98357A chip, directly drives speakers without external LC filter

●I2S Digital Audio Input: Accepts digital signals directly, no external DAC needed — only 3 signal wires required for audio transmission

●3W Output Power: Delivers up to 3W into a 4Ω load for ample volume

●High-Fidelity Audio: 90dB SNR and low THD+N of 0.1% for clear,Purity sound quality

●Wide Voltage Compatibility: 2.5V ~ 5.5V operating range, compatible with both 3.3V and 5V systems

●High Efficiency, Low Heat: Class D efficiency up to 90%+, no extra heat sink required

●Compatible with Mainstream Boards: Works with ESP32, Arduino, Raspberry Pi and other I2S-enabled devices

●Includes 2831 Speaker: Ready to use out of the box — no need to purchase a separate speaker

Applications

●Bluetooth speakers / Smart voice devices

●IoT voice alerts (doorbells, alarms, voice announcements)

●Robot speech output

●Smart home audio feedback

●DIY desktop audio systems

●Interactive installations / Maker education projects

Important Notes

1.Speaker Impedance: Supports 4Ω and higher dynamic speakers. Cannot be used as a preamplifier.

2.Power Supply Voltage: 5V supply delivers maximum 3W output; output power decreases with 3.3V supply.

3.ESD Protection: Touching the board with bare hands may damage components. ESD-safe handling is recommended.

Package Contents

• 1 Set

  2831 Speaker × 1

  MAX98357A I2S Amplifier Module × 1

  PH2.0-4Pin to Dupont Cable × 1

  Lego Compatible Brick Base × 1

  
  

• 2 Set

  2831 Speaker × 2

  MAX98357A I2S Amplifier Module × 2

  PH2.0-4Pin to Dupont Cable × 2

  Lego Compatible Brick Base × 2

FAQ

Q: Do I need an external filter capacitor?

A: No. The MAX98357A uses filterless Class D technology and can drive speakers directly.

Q: Does it support stereo?

A: The chip is mono output. The module defaults to stereo mixing mode.

Q: Can it run on battery power?

A: Yes. Operating voltage range is 2.5V ~ 5.5V, compatible with lithium battery power.

Q: No sound from the speaker — how to troubleshoot?

A: ① Check that power supply is normal; ② Verify I2S connections (BCLK/LRC/DIN) are correct; ③ Confirm the I2S sample rate in your code is within 8kHz ~ 96kHz.

Q: What if there's distortion at maximum volume?

A: Check if your power supply is adequate (5V/1A or higher recommended). You can also try reducing gain via the GAIN pin.

Q: What is the operating temperature range?

A: -40°C ~ +85°C, suitable for most indoor and outdoor applications.