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SNAPCIRCUITS Audio Amplifierby BAURO
Book Shelve Stereo Amplifiers - DIYby profpat
Multipurpose Audio Amplifierby Gadget Gangster
USB Stereo Amplifier On-The-Cheap (<$25) from Broken Headsetby appsman
Headphone phoneby Legobuilder63
How to Build a Triple Transistor Headphone Amplifierby Inducktion
Super Simple Speakerby NYU_MusicTechnology
Headphone amplifierby Milen
Upgrading Amplifier by rodski
Simple, Powered Pocket Amplifierby imanalchemist
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