Pure post-stage HIFI power amplifier based on TDA1521/TDA2616, the two are interchangeable, but the 2-pin connection method is different. TDA2616 has added output short-circuit protection than the familiar TDA1521, and supports 4 ohm speakers. It is recommended to use 3-4 inch high-quality speakers, which can be used as desktop speakers or bookshelf speakers.
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