CM2038 PM2038 SJ2038 twochannel amplifier board Type and purpose Dual BTL audio power amplifier for compact stereo applications. Power and load performance With a 6 V supply, delivers 3.5 W into a 4 Ω load (5 W) with a guarantee of less than 10%, or 2.2 W into an 8 Ω load. Operating voltage DC 2–6 V range; recommended voltage is DC 5 V. Circuit features and protections PM2038 circuit includes external control, a lowpower shutdown mode, and internal thermal protection. Also reduces the poweron surge pulse in the circuit. Product identity Product name: CM / PM / SJ2038 twochannel amplifier board. Compatibility and usage notes Suitable for driving both 4 Ω and 8 Ω loads. Designed for use in batterypowered or lowvoltage audio projects requiring twochannel amplification. Practical use scenarios Portable Bluetooth or small batterypowered speaker builds requiring compact stereo amplification. DIY audio projects and educational kits that involve lowvoltage audio amplification and microcontroller control. Prototyping microcontrollerbased audio systems that need safe poweron behavior and thermal protection. Key advantages Twochannel BTL design for stereo output in a small form factor. Flexible lowvoltage operation (2–6 V) with a recommended 5 V for performance. Builtin protections (thermal) and a controlled poweron surge, plus external control capability for easy integration.