FM发射机电路图（FM收音机/ FM IF / MW无线电发射机电路图的详细说明）

FM发射器电路图（1）
The working principle and circuit diagram of the FM transmitter meet the requirements of the transmission distance, and it can also use the microphone and the line to input the sound signal at the same time for background dubbing.调频发射机的工作原理和电路图满足传输距离的要求，还可以使用麦克风和线路同时输入声音信号进行背景复制。 The circuit has also added a modulation monitoring header to better grasp and use the transmitter.该电路还添加了一个调制监控头，以更好地掌握和使用发送器。 The circuit is as shown in the figure below.电路如下图所示。 After reading the brief introduction, do you think it has as many functions as a set of broadcasting station equipment.阅读简要介绍后，您认为它具有与一组广播电台设备一样多的功能。 Yes, this small transmitter can help you easily set up an amateur FM radio station!是的，这个小型发射机可以帮助您轻松设置业余FM广播电台！ The coverage is about 500M.覆盖范围约为XNUMXM。

电路原理及元件选择：
R1一直通过测试频率LC振荡器对混合信号进行调制，该测试频率由BG1 FET和周围电路组成。 BG1使用1DO17场效应管，D2变容二极管使用3S1。 The antenna is required to use 2/85 wavelength.要求天线使用324/200波长。 If a whip antenna is used, it is better not to be less than one meter.如果使用鞭状天线，最好不要小于一米。 Otherwise, the overdue launch effect will not be achieved.否则，将无法实现逾期发射的效果。

FM发射器电路图（2）
经典15W FM发射器的电路图

FM发射器电路图（3）
该无线麦克风电路设计合理，外形美观，声音传输距离长，使用寿命长，经济，功耗低，非常适合普通调频广播接收。

振荡线圈L的生产：在Ф0.5mm直柄钻上使用Ф5mm漆包线缠绕4T并取下。

Adjustment of the oscillation coil L: Turn on the radio (placed in the FM section) and the microphone switch, then hold the microphone and adjust the knob while speaking into the microphone until your own voice is heard from the radio.调节振荡线圈L：打开收音机（位于FM部分）和麦克风开关，然后一边对着麦克风讲话，一边握住麦克风并调节旋钮，直到从收音机听到自己的声音为止。 If you still cannot receive your own voice in the entire frequency band (ie 88～108MHz), carefully move the oscillating coil L. When you move, you only need to open or reduce the distance between each turn of the coil.如果仍然无法在整个频段（即XNUMX〜XNUMXMHz）内接收到自己的声音，请小心地移动振荡线圈L。移动时，只需打开或减小线圈每匝之间的距离。 Be careful when adjusting.调整时要小心。 If adjusting the tightness of the coil still has no effect, weld down L to add one turn or decrease one turn (due to the influence of electronic component parameters), and continue the above adjustment after re-welding.如果调整线圈的松紧度仍然无效，请焊接L以增加一圈或减少一圈（由于电子元件参数的影响），并在重新焊接后继续上述调整。

Before preparing for installation and production, please use a multimeter to screen the quality of each component.在准备安装和生产之前，请使用万用表筛选每个组件的质量。 If possible, measure the capacitance of each ceramic capacitor, so that it is foolproof, and the installation is successful.如有可能，请测量每个陶瓷电容器的电容，以确保万无一失，并且安装成功。 The quality should be guaranteed during welding, and there should be no false welding, false welding, and wrong welding.焊接过程中应保证质量，不得有误焊，误焊和误焊。