microphone current supply

例句：

1. 1.The microphone is a device that converts sound into electrical signals.
   麦克风是一种将声音转换为电信号的设备。
2. 2. The microphone is used in various applications, including recording and broadcasting.
   麦克风被用于各种应用，包括录音和广播。
3. 3. The microphone is essential for transmitting audio signals over long distances.
   麦克风对于在长距离传输音频信号至关重要。