Amply is a compact, high-quality audio amplifier and Bluetooth receiver that can be built from roughly $10 worth of widely available parts.

Designed for desktop speakers, it delivers up to 2×10 W into 8 Ω loads while running from an ordinary USB-C power adapter. The entire design uses common, easy-to-source components, making it practical to build almost anywhere.

Despite its low cost, Amply offers surprisingly strong audio performance: THD below 0.015%, excellent linearity, and a flat response extending down to 20 Hz for deep bass, clean mids, and detailed highs.