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2026.02.06
vfb amplifier
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[Abyss Audio] (3) Final Build and Performance Check — Popo BVPPC Headphone Amplifier (DIY)
Hello. The cold has returned a bit — freezing… SweatNow then, this is the third ...
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2026.01.23
vfb amplifier
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[Abyss Audio] (2) PCB Rescue Operation — OPA Bi‑Variable Push‑Pull Composite Amplifier (Headphone Amp) DIY
Good evening. A cold wave has arrived — and my PCB completely self‑destructed! &...
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2026.01.15
vfb amplifier
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[Abyss Audio] (1) Circuit Design — OPA Bi‑Variable Push‑Pull Composite Amplifier (Headphone Amp) DIY
Good evening. Recently, for late‑night listening in the bedroom, I’ve been using...
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