火车汽笛声电路-NE556

软件翻译：
　　当按下SW1将训练通过扬声器发出的噪音。创建用于声音报警和other.Using IC 556，是一个伟大的电路，
　　此电路包括一个小。因为它采用了单颗IC。工作立体声扬声器直接操作circuit.When连接电源supply.Low的频率发生器电路开始的第5脚。一个单独的部分的9针。要取决于扬声器的driver.Frequency在R2，C2。The的的信号从5引脚连接的8管脚。R6，C1复位电路的延迟。
　　当复位引脚8个信号。高频信号发生器会出来IC1的引脚9。因此，有特征的声音，低频的频率。再高的频率。
原文：
When pressed Sw1 will train noise emitted through the speakers. Created for use as sound alarms and other.Using the IC 556 is a great circuit.
This circuit features a small. Because it uses a single IC. Working out sound speakers directly.
Operation of the circuit.When connecting the power supply.Low frequency generator circuit to start out the 5th pin. A separate section to the 9 pin. To the speaker driver.Frequency depends on the R2, C2。The signal from the 5 pin is connected to the 8 pin。The R6, C1 to reset the circuit delay.
When the reset pin 8 signal. High frequency signal generators will come out at pin 9 of IC1. So frequencies that are characteristic of sound, low frequency. Then a high frequency.