Compact mono Class D amplifier board (Model 5128, VS88715V) designed for lowdistortion audio amplification in small DIY and embedded projects. Why this board is useful Delivers clean, efficient mono audio amplification for small speakers. Its Class D design provides good power efficiency and low heat, making it ideal where space and power are limited. Low distortion output preserves audio clarity for voice, music, and simple audio playback—useful when you need better sound than a raw speaker can provide. Small, singleboard form factor makes integration into hobby, prototype, and production projects straightforward. Key attributes Model: 5128, chip: VS88715V Output: Rated 5W Class D mono amplifier (typical working range 3–5W) Channel: Single (mono) audio output Audio quality: Low distortion design for clear playback Efficiency: Class D operation reduces heat and power consumption compared with linear amplifiers Construction: Compact PCB module suitable for mounting inside enclosures or devices Compatibility: Works with common linelevel audio sources (MP3 players, smartphones, microcontrollers, Raspberry Pi, etc.) when properly connected; suitable for driving small speakers rated in the 3–5W range What it solves Upgrades audio performance of small speakers by providing a dedicated amplifier stage. Reduces heat and power waste in batterypowered or spaceconstrained applications. Simplifies implementation of amplified audio in projects without requiring a large amplifier or complex cooling. Typical applications DIY portable speaker or Bluetooth speaker projects (as the amplifier stage paired with a Bluetooth receiver and a 3–5W speaker) Embedded audio for Raspberry Pi, Arduino, or other microcontroller projects where a compact, efficient mono amplifier is needed Intercoms, toys, small publicaddress modules, or any project requiring a modest singlechannel power amplifier for voice or music Basic integration notes Connect an appropriate linelevel audio input, a 3–5W speaker to the output, and a suitable DC power supply per the module's requirements. For safety and performance, start testing at low volume and ensure wiring is secure and polarity correct. Mount the board in a ventilated enclosure if continuous power output is expected. Included 1pc 5128 Amplifier Board (VS88715V) This module is a straightforward, reliable choice when you need a small, efficient mono amplifier with low distortion and a 3–5W output range for hobby, embedded, and small commercial audio applications.