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这个有线对讲电话不需电源,直接用两根导线将两个普通电话机上用的听筒D1、D2组成如附图所示的串联电路,就可以对话了,通话距离可达几百米。若选用老式听筒,其背面无接线螺钉,可用小螺丝刀将听筒背面的两个金属片(中央的为圆形,周围的为圆环形)向外撬起约1毫米,然后将导线从金属片与听筒壳之间穿过绕紧,再用绝缘胶布贴牢固定,以防止短路。导线一般取20～30米长,若用单股漆包线,要用小刀将线头处
The wired intercom does not need power, and the two direct lines use the handset D1 and D2 on the two ordinary telephones to form a series circuit as shown in the figure, so as to talk to each other, and the call distance can reach several hundred meters. If the old-style earpiece is used, the back of the handpiece is screw-free. Using a small screwdriver, lift the two metal tabs on the back of the earpiece (approximately circular in the center and circular in the circumference) by about 1 mm to the outside, And between the receiver shell through the tight, and then tape insulation firmly fixed to prevent short circuit. Wire generally take 20 to 30 meters long, if the single enameled wire, use a knife to line head