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本文介绍一种用常用电子元件自制的电话应急通话器。该通话器体积小巧,电路简单,成本低廉,组装使用非常方便。您可以将其安装在厨房和卫生间等部位并与电话线接通,这样,当有电话打来时,您可就近在此处用其应急接听电话。该通话器无须另外配接电源,只要将其接入您家的电话线,就可以象使用自动电话机接听电话一样与对方交谈使用了。 电路组成与工作原理:电路如图1所示。该电路主要由
This article describes a home-made phone emergency caller using common electronic components. The speaker compact, simple circuit, low cost, easy to use assembly. You can install it in the kitchen and bathroom etc. and connect it to the telephone line, so that when a call comes in, you can use it to answer the call nearby. The phone does not require additional power, simply plug it into your home phone line, and talk to the other person just as you would an automated phone to answer the phone. Circuit composition and working principle: circuit shown in Figure 1. The circuit is mainly composed of