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我们购买了插头式电源变换器作为录音机电源,结果录出的带子因交流声大大无法使用。这是因为此装置仅用一只电容滤波,用作录音机电源时,录出的带子上有交流声。我们按图所示的方式加装了一个简单的电子滤波器,达到了十分满意的效果。该图装置仅花费1元多,结构简单。易于制作,有兴趣者不妨一试。图中100～470μF电容器可视情况加或不加。图中虚线部分为加装的滤波器,晶体管无特殊要求,选用3AX系列。根据工作电流的大小选用,3AX31、3AX81等,β>60,反向击穿电压大于10伏即可。
We purchased a plug-in power converter as the power supply for the recorder, and as a result the tapes we recorded were significantly out of acoustics. This is because the unit is filtered with only one capacitor and when used as a recorder, there is an audible tone on the recorded tape. We have installed a simple electronic filter as shown in the figure to achieve a very satisfactory result. The figure device only takes more than 1 yuan, the structure is simple. Easy to make, there are interested who may wish to give it a try. Figure 100 ~ 470μF capacitor with or without the optional case. Part of the dotted line for the installation of the filter, the transistor no special requirements, the choice of 3AX series. According to the size of the operating current selection, 3AX31, 3AX81, etc., β> 60, reverse breakdown voltage greater than 10 V can be.