The project, called the 503HTA, packs a single 12AU7 or 6922 tube and a solid-state IRL510 Mosfet circuit into a hybrid amplifier that mounts to 40-pin Raspberry Pi boards, including the Pi 2 and Pi 3. It includes a 24-bit DAC, a gain select switch, and a 3.5mm headphone jack. Putting out just 500mw, it’s designed…
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