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Archimago's Musings: Retro DIY Headphone Amp - The Audio Amateur, Gary A. Galo design, built by Mitch Barnett circa 1991.
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Crystal CMoy Free Form Headphone Amplifier: 26 Steps (with Pictures) | Headphone amplifiers, Diy electronics, Diy audio projects
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Amazon.com: 160W+160W Amplifier Board with Treble and Bass Control, DC 12-36V, BT and AUX Inputs, 2.0 Channel Stereo AMP Board for DIY Wireless Speakers, Password Free (T160HS) : Electronics
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