Adafruit MAX98306 Stereo 3.7W Class D Audio Amplifier Board | thingbits

Adafruit MAX98306 Stereo 3.7W Class D Audio Amplifier Board

Name: Adafruit MAX98306 Stereo 3.7W Class D Audio Amplifier Board
SKU: TH1983
Price: 879.0 INR
Availability: OutOfStock

SKU: TH1983

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If you want “real” speaker volume without the size, heat, and battery drain of older analog amps, the MAX98306 is a solid upgrade. This miniature stereo Class-D amplifier can deliver up to 2 × 3.7W into 3Ω speakers (at 5V), while staying highly efficient—ideal for handheld gadgets, embedded audio, and compact enclosures.

₹1,037.22

₹879.00 (Ex. of GST)

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Overview

Inputs are capacitor-coupled with 1.0µF caps and support differential signaling; for single-ended sources, simply tie L− and R− to GND. Outputs are Bridge-Tied Load (BTL), meaning the speaker terminals are not connected to ground and the amp is meant to drive speakers directly (not another amplifier input).

The board also includes a gain-select jumper (and breakout pins) to choose from 5 gain levels (6–18 dB), plus built-in thermal and over-current protection for robust everyday use.

Specification

Technical details for MAX98306 Stereo 3.7W Class D Audio Amplifier Board.

Specification	Details
Amplifier Type	Stereo Class-D
Amplifier IC	MAX98306
Input Voltage	2.7V to 5.5V DC
Output Power (5V Supply)	2 × 3.7W @ 3Ω, 10% THD; 2 × 1.7W @ 8Ω, 10% THD
Speaker Impedance	3Ω or higher
Outputs	BTL (Bridge-Tied Load), speaker outputs not referenced to GND
Input Coupling	1.0µF capacitors (differential-capable)
Gain Settings	6dB, 9dB, 12dB, 15dB, 18dB (jumper or G/G’ pins)
Efficiency	>90% (typical use case)
Quiescent Current	~2mA
Shutdown Current	~10µA
Protection	Thermal + short-circuit / over-current protection
Noise/Artifacts	Click-and-pop suppression
PSRR	83dB @ 217Hz
EMI Controls	Spread-spectrum modulation + active emissions limiting
Included Hardware	Assembled board, breadboard header, pre-soldered 3.5mm screw terminals, pre-soldered 2×4 header, gain jumper
Speakers Included	No

Pinout

Pinout guide for Adafruit MAX98306 Stereo 3.7W Class D Audio Amplifier Board.

Pin / Label	Description
VDD	Power input: +2.7V to +5.5V DC
GND	Ground (0V)
R+	Right audio input (+). For single-ended sources, connect to Right signal.
R-	Right audio input (−). For single-ended sources, tie to GND. For differential sources, connect to Right (−).
L+	Left audio input (+). For single-ended sources, connect to Left signal.
L-	Left audio input (−). For single-ended sources, tie to GND. For differential sources, connect to Left (−).
ROUT+	Right speaker output (+). Connect to Right speaker + terminal (BTL output — not GND).
ROUT-	Right speaker output (−). Connect to Right speaker − terminal (BTL output — not GND).
LOUT+	Left speaker output (+). Connect to Left speaker + terminal (BTL output — not GND).
LOUT-	Left speaker output (−). Connect to Left speaker − terminal (BTL output — not GND).
GAIN (4×2 header + jumper)	Select amplifier gain by placing the jumper on one of the 4 marked positions: 9dB / 12dB / 15dB / 18dB.
Important BTL Note	Do not connect any speaker output to GND. Do not connect ROUT to LOUT (do not bridge channels). Use speakers of 3Ω or higher.