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关于蜂鸣器驱动电路的问题

为什么接了R2蜂鸣器不能响，不接就能响？

2025-04-07 10:27:50

推荐回答（2个）

回答1：

你好：

——★1、假设三极管集电结断路、或集电极电压不正常 ...... 当你不接 R2 时，三极管的发射结就是一只正向二极管，输入电压加到蜂鸣器上，所以蜂鸣器会发出声音。

——★2、当输入信号电压通过 R2 为三极管提供偏流时，蜂鸣器不响，除了三极管集电极电压不正常外，就是假设的三极管集电结断路。

——★3、也不排除三极管基极电阻 R2 取值过大，三极管不能导通所致。

回答2：

可能是接了R2后驱动电流太小了吧

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