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Lm386 Mono Audio Amplifier Module 200 Times Gain Amp Solo 10k Adjustable Potentiometer For Arduino Dc 5v-12v - Instrument Parts & Accessories - AliExpress
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Arduino Digital Control | Adafruit 20W Stereo Audio Amplifier - MAX9744 | Adafruit Learning System
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Adafruit "Music Maker" MP3 Shield for Arduino w/3W Stereo Amp
Simple audio player | Arduino Documentation | Arduino Documentation
One-transistor audio amplifier for Arduino projects | Bryan Duxbury's Blog
10Pcs 2x3W Dual Channel Mini Digital Power Amplifier Board PAM8403 For Arduino Class D Stereo Audio Amplifier Module 5V Power|board board|board for arduinoboard digital - AliExpress
Need a simple audio amplifier - General Electronics - Arduino Forum