用录音机进行电话自动录音的方法在报刊上介绍过不少,其中有的需在电话机叉簧开关上作改动,较为麻烦;有的在挂机状态下电源消耗大,不够经济。总之,这些方法或多或少存在一些不足。笔者设计了一种简单实用的电路,可较好地克服上述缺点,喜爱动手制作的朋友不妨一试。 笔者设计的实用电路如图1所示。其中,电容C1及R1、R2等组成录音信号输入电路,光电管IC与VT1、VT2、VT3等构成录音机电源自动开关。其工作原理是:挂 The automatic recording method of a telephone with a voice recorder has been introduced in the press, some of which need to be changed on the telephone hook switch, which is troublesome. In some cases, the power consumption is heavy and not economical enough in the on-hook state. In short, there are some deficiencies in these methods. The author designed a simple and practical circuit, can better overcome the above shortcomings, like to make hands-on friends may wish to try. The author designed the practical circuit shown in Figure 1. Among them, the capacitor C1 and R1, R2 and other components of the recording signal input circuit, phototube IC and VT1, VT2, VT3 and other recorder power supply automatic switch. Its working principle is: hang