XH-M145 Class D Stereo Audio Amplifier Board with YDA138-E Chip (8W+8W / 12W+12W)

The XH-M145 is a compact Class D stereo audio amplifier board built around the Yamaha YDA138-E integrated circuit, designed to deliver high-resolution audio amplification for DIY speaker systems, portable audio devices, and embedded sound projects. The board operates in Class D mode with automatic pulse-width modulation, achieving high thermal efficiency so that no external heatsink is required even at full output. With an 8Ω speaker load, it delivers 8W + 8W of stereo power, and with a 4Ω load, output increases to 12W + 12W, providing enough headroom for desktop speakers, monitor audio, and small-room sound systems.

The XH-M145 accepts a wide DC input range of 9V to 14V, with a recommended supply of 12V at 1.5A to 2A. The board includes a built-in rotary volume potentiometer, a standard 3.5mm audio input jack, and a 3-pin input connector for flexible source connection. Power and speaker outputs are routed through heavy-duty green screw terminal blocks, enabling solder-free wiring. The amplifier achieves a signal-to-noise ratio of 92%, supported by integrated noise-reduction circuitry, and includes over-current protection and thermal protection to safeguard both the board and connected speakers. The module measures 58mm × 36mm × 21mm (excluding the potentiometer protrusion) and weighs approximately 26g, making it easy to integrate into compact enclosures.

Typical applications include portable speakers, LCD monitor and projector audio, notebook sound systems, portable DVD players, game machines, and general-purpose stereo audio amplification. The board’s Class D design keeps heat generation low and efficiency high, making it a practical choice for battery-powered or space-constrained audio projects where clean stereo sound is required.