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一、电路工作原理德律风根５０００型彩电的伴音通道部分主要由ＩＣ４１１（ＴＢＡ１２０Ｔ）和ＩＣ４１２（ＴＤＡ１９０５）两块集成电路组成。具体电路如图１所示。ＴＢＡ１２０Ｔ主要功能有中频放大，鉴频检波。ＴＤＡ１９０５主要功能是功率输出放大。从图像中放电路输出
First, the circuit works Telefunkar 5000 color TV’s audio channel part mainly by the IC411 (TBA120T) and IC412 (TDA1905) two integrated circuits. Specific circuit shown in Figure 1. TBA120T main function of IF amplification, frequency detection. TDA1905 main function is to enlarge the power output. Discharge circuit output from the image