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本文介绍的调频立体声发射模块MEC001具有体积小巧、功能完善等特点。其工作频率在调频广播频段(88～108MHz)之内,工作电压为1～3V。该模块的外形尺寸及引脚排列如图1所示。各引脚功能如下:+、-引脚为外接电源端,最佳工作电压1.5V;L、R引脚为立体声音频信号输入端;S引脚为单声道/立体声选择控制端,悬空时为立体声发射工作方式,接地时为单声道发射工作方式;A引脚为外接天线端。 MEC001的内部结构框图如图2所示。它包括了预加重电路、平衡调制器、38kHz振荡器、射频振荡器及射频放大器等调频立体声发射机基本电路,其实质是一部微型调频立体声发射机。该模块可广泛应用于各类音频电路中,它将立
This article describes the frequency modulation FM transmitter module MEC001 compact, functional and so on. The frequency of its FM radio frequency band (88 ~ 108MHz) within the working voltage of 1 ~ 3V. The module dimensions and pin arrangement shown in Figure 1. The function of each pin is as follows: +, - pin is external power supply terminal, the best working voltage is 1.5V; L, R pin is stereo audio signal input terminal; S pin is mono / stereo select control terminal, Stereo emission mode of work, when grounded for mono launch mode; A pin for the external antenna. MEC001 internal structure block diagram shown in Figure 2. It includes the basic circuit of FM stereo transmitter such as pre-emphasis circuit, balanced modulator, 38kHz oscillator, RF oscillator and RF amplifier. The essence is a mini FM stereo transmitter. The module can be widely used in various audio circuits, it will stand