现在家用电话机带液晶显示的越来越多,而其时钟大都用干电池做电源、干电池用的时间久了会流液,使用起来,易造成电子电话机线路板腐蚀损坏。笔者经过计算、试验,找到了一种能用电话机绳路电源替代干电池的电路,电路简单实用。电路如图1、图2所示。其中图1为电话机极性保护电路,图2为所加液晶用电源电 Now home telephone with LCD more and more, and most of its clock with a dry battery to do the power supply, the battery for a long time will flow, use, easy to cause corrosion of electronic telephone circuit board damage. After calculating, testing, I found a way to replace the dry cell telephone circuit power supply circuit, the circuit is simple and practical. Circuit shown in Figure 1, Figure 2. Figure 1 for the phone polarity protection circuit, Figure 2 is added LCD power supply