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笔者本人有一款老式的德生便携式收音机,能接收AM、FM两个波段的电台信号,天线是由粗铜线绕制成一直角,卧于机壳内,因此未设有外接拉杆天线,但收音效果也不错,并配有耳机插孔,十分适于外出携带。但惟一美中不足的是没有配置外接电源插孔,所以笔者欲对其进行改装。该机一侧还设有电源指示灯,一般指示灯电路是由一支电阻和一支发光二极管串接后,并联于电源两端的,而且指示灯靠于电路板边缘,所以我决定从这里接线。拆开机壳
I have an old German-German portable radio, AM and FM can receive two bands of radio signals, the antenna is made of thick copper wire wound at right angles, lying in the chassis, so there is no external antenna rod, but Radio effect is not bad, and with a headphone jack, very suitable for carrying out. But the only fly in the ointment is not equipped with an external power jack, so I want to be modified. The side of the aircraft also has a power indicator, the general indicator circuit is a resistor in series with a light-emitting diode, parallel to the power supply at both ends, and the indicator light on the edge of the circuit board, so I decided to connect from here . Open the case