Some resources to help you getting started with STM32 programming.
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The board adopts the typical circuit design of PAM8403, and adopts MICRO USB power supply connection (reserved wire bonding interface). It is convenient to use the universal mobile phone charger to supply power to it. The resistive container parts are all standardized and patched, which is simple and stable. Designed a special interface for the Bluetooth audio receiver module, easy DIY Bluetooth speaker. The board can be connected to 8 ohms, 4 ohms, suitable for full-range speakers or full-range small speakers.
Supply voltage: DC3.4V-DC5V
Output power: 3.0W x 2