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TDA2030是怎么将一个小电压小电流的信号,放大那么大,它的放大倍数只和电路的外部参数有关吗??

我想问问,这个TDA2030外面放大倍数大约为32倍,把手机耳机插孔的那么小的功率放大很大,是怎么实现的呀?不是有电压和电流吗,是怎么放大的呀?