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单路，6V单电源供电，增益可通过外部电位器0~10db（或更大）可调，低噪
输出功率多大呢，确定是要运放不是功放吗
音频的运放产品很多，不知对带宽，压摆率有什么 要求，单通道的可看下OPA172这款。
