简易的蜂鸣器-其他传感器电路图

　　这种新颖的的蜂鸣器电路采用继电器串联一个小的音频变压器和扬声器。当开关被按下，继电器会通过变压器初级和封闭继电器触点操作。只要继电器动作，常闭触点打开，切断电源，继电器，触点闭合，重复序列，都非常快......如此之快，在变压器初级的电流引起波动的脉搏，因此二次。因此扬声器音继电器工作频率成正比。该电容器C可以使用“调谐”的说明。0.001UF面值，增加电容降低蜂鸣器音
　　原文：
This novel buzzer circuit uses a relay in series with a small audio transformer and speaker. When the switch is pressed, the relay will operate via the transformer primary and closed relay contact. As soon as the relay operates the normally closed contact will open, removing power from the relay, the contacts close and the sequence repeats, all very quickly…so fast that the pulse of current causes fluctuations in the transformer primary, and hence secondary. The speakers tone is thus proportional to relay operating frequency. The capacitor C can be used to “tune” the note. The nominal value is 0.001uF, increasing capacitance lowers the buzzers tone.

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