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在大型厂矿的调度室和值班室等地方,桌上往往安放着许多台电话机,有时当电话响铃时,一时很难区分是哪一台在响,容易造成错拿电话,耽误了及时接听。 怎样解决这个问题呢?只要在每台电话机上装一只信号显示灯就可以了。信号显示灯可以用普通氖管和一只电阻串联,然后将它并联到电话机交流电铃的两端,当电话机响铃时,氖管随之发亮,这样,当电话响铃时,只要观察哪一只灯亮就可有目的的去拿起电话手机。根据经验,氖管可选用NH-4B型,电阻阻值可为10
Large factories and mines in the dispatch room and duty room and other places, the table is often placed on a number of telephones, and sometimes when the phone rings, it is difficult to distinguish between a moment is ringing, likely to cause the wrong phone, delay the timely answer . How to solve this problem? As long as each phone installed a signal light on it. The signal indicator can be connected in series with a neon tube and a resistor in parallel and then connected in parallel across the bell to the telephone. When the telephone rings, the neon tube lights up, so that when the telephone rings, Observe what a light can be purposeful to pick up the phone. According to experience, neon tube can choose NH-4B type, resistance value can be 10