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功放电源电压与输出功率选择



尊敬的各位!

      大家好!

      请教一个问题,功放输出功率与电源电压的选择是如何计算的?比如,要输出4Ω,20W,电源的电压选择多少V合适?越详细越好,非常感谢各位!