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本文介绍的这种发射器可以利用任何小型调频收音机收听电视伴音,该装置的有效距离可以让你在客厅内自由选择观看位置,以免影响他人。发射器的电路很简单,如附图所示。VT组成电容反馈式三点振荡电路,L和C3设定在FM段发射频率的最低端(即87.9MHz),以避开当地FM广播信号。变压器T为一般小型收音机输出变压器,其Ⅰ为原变压器的次级低阻抗绕组,Ⅱ为原输出变压器
This article describes the transmitter can use any small FM radio to listen to TV sound, the device’s effective distance allows you to freely choose to watch the location in the living room, so as not to affect others. The transmitter circuit is very simple, as shown in the attached figure. VT consists of a capacitive feedback three-point oscillator with L and C3 set at the lowest end of the FM segment transmit frequency (ie, 87.9 MHz) to avoid local FM broadcast signals. Transformer T is a general small radio output transformer, the first of its original low-impedance winding transformer, Ⅱ for the original output transformer