CM / PM / SJ2038 twochannel amplifier board Key features and benefits Dual BTL audio power amplifier The CM2038 is a twochannel BTL audio power amplifier designed for stereo applications, providing strong output from a compact board. Wide and practical power/voltage range Operating voltage range: DC 26V (recommended DC 5V). This makes it suitable for batterypowered and lowvoltage projects. Clear output specifications at 6V With a 6V supply, the CM2038 can deliver 3.5W of output power into a 4Ω load (5W capability stated) with a guarantee of less than 10%, or 2.2W into an 8Ω load. This provides usable drive for small loudspeakers in compact designs. PM2038 circuit protections and control The PM2038 circuit includes external control, a lowpower shutdown mode, and internal thermal protection. It also reduces the poweron surge pulse in the circuit, helping protect power supplies and improve startup behavior. Applications and use scenarios Batterypowered stereo speakers Use in portable, lowvoltage speaker projects that require a twochannel amplifier with protection features and simple power management. Embedded audio in microcontroller projects Suitable for integrating with microcontroller platforms (such as Arduino or similar MCUs) where a compact, efficient amplifier is desired to drive small speakers. Educational and prototyping kits A straightforward twochannel amplifier module for learning about BTL amplification, power management, and thermal protection in a practical handson setup.