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最近邮购一台新颖的望远镜式的微型调频收音机,价格仅10元。整机用3V电源供电。整机采用轻触式电子调谐及自动跟踪搜索选台并锁定,自动静噪功能。面板极为简洁、2只轻触键、音量电位器和一只电源指示灯,耳机插孔为电源开关,当插上耳机时,才能接通电源。内部线路板仅为65cm×68cm。IC芯片采用飞利浦FM自动选台专用调频集成电路TDA7088T。笔者测绘出其电原理图如图1所示。供大家参考。 S1足IC的清零开关;S2是选台开关。按S1复位(RESET)轻触键清零后,再按数字调谐(SCAN)选台开
Recently mail-order a novel telescope-type mini FM radio, the price is only 10 yuan. Machine with 3V power supply. Machine touch electronic tuning and automatic tracking search and lock station, automatic squelch function. Panel is extremely simple, 2 touch keys, volume potentiometer and a power indicator, headphone jack for the power switch, plug in the headset, the power can be switched on. The internal circuit board is only 65cm × 68cm. IC chip Philips FM automatic tuning special FM IC TDA7088T. I plotted the electrical schematic shown in Figure 1. For reference. S1 foot IC reset switch; S2 is station selection switch. Press S1 Reset (RESET) After the touch of a button to clear, and then press the digital tuning (SCAN) selected Taiwan open