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一台松下L-15录像机在放像过程中突然伴音消失,随后便出现“嗡嗡”的交流声(图像及其它部分均正常),经查为射频调制器内的调制集成电路AN3100N音频电路部分损坏,在无法找到备件代换的条件下,笔者用分立元件制作了一个音频调制器,并对电路作了如下改动,取得良好效果。图1 为射频变换器电原理图。AN3100N为调制集成电路,SW_1为射频输出选择开关,SAW为射频信号的声表面波振荡器,T_1为6.5 MHz伴音信号调制振荡器的回路可调电感。AN3100N的脚 2、3、4、5、6为音频调制器的外接电路,脚7为射频输出,脚10为视频输入,脚6和脚14分别为音频调制和视频调制电路部分的电源加入端。
A Panasonic L-15 VCR suddenly disappeared in the playback process, and then there will be a “buzzing” hum (the image and other parts are normal), the RF modulator modulator IC for the AN3100N audio circuit section Damaged, unable to find spare parts replacement conditions, the author made a discrete component audio modulator, and made the following changes to the circuit, and achieved good results. Figure 1 RF power converter schematic. AN3100N is a modulation integrated circuit, SW_1 is a radio frequency output selector switch, SAW is a surface acoustic wave oscillator of a radio frequency signal, T_1 is a loop adjustable inductance of a 6.5 MHz audio signal modulation oscillator. AN3100N feet 2, 3, 4, 5, 6 for the audio modulator external circuit, 7 for the radio frequency output, the pin 10 for video input, pin 6 and pin 14 for the audio modulation and video modulation circuit part of the power input .