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只需对收音机做一很小改动,安装在自行车扶把上,行车时不仅能方便的收听,并且按下设置的按钮时,喇叭会发出“呜呜”的鸣叫声,可以起到自行车铃的作用。如有兴趣清一试。电路原理:收音机内的线路连接如图示。当按下按钮开关时,电路本身的噪声信号便通过耦合电容C送入收音机功放电路、放大了的噪声信号复又送入放大电路,又进一步的放大。这样周而复始的产生强烈的
Just make a small change to the radio, mounted on the bicycle handlebar, driving not only easy to listen, and press the button set, the speaker will be issued “whining ” of the sound, you can play a bicycle The role of the bell If you are interested in a try. Circuit principle: The radio line connection as shown. When the push button switch is pressed, the noise signal of the circuit itself is fed into the radio amplifier circuit through the coupling capacitor C, and the amplified noise signal is sent to the amplifier circuit for further amplification. This cycle produces strong