TDA1521 Reference price: 1.7 yuan
High-fidelity power amplifier IC, TDA 1521 adopts nine-pin single-in-line plastic package, is Philips 2×15W single-chip power amplifier integrated circuit, few peripheral components, easy to use, with short circuit protection and noise suppression function, the internal resistance of the power supply is less than 4 ohms, to ensure that the load short circuit protection function is reliable.
TDA7294 Reference Price :6 yuan LM4702 is a high-performance audio power amplifier driver IC announced by National Semiconductor Corporation in September 2006, and the power amplifier driven by it can obtain a maximum output power of 300W.
In addition, the LM4702 has internal mute and multiple protection features, which is suitable for advanced home audio systems