下面提出的文章描述了一个非常简单的对讲系统，可以非常便宜地在任何所需的地方构建和安装。该电路仅利用单个IC和整个组件的很少的其他组件。
How it Works
If you are looking for a simple and low cost intercom system for home installation, you would love the explained project.
The circuit only uses a single chip for the amplification purpose and a couple of speakers along with a handful of passive components for acquiring the intending intercom application circuit.
As seen in the figure the entire circuit hovers around the IC LM380 which is another versatile amplifier IC just like it's younger brother IC LM386.
The IC is manufactured by:
然而，这种芯片更好，因为它需要很少的外部组件来实现放大器动作。
在图中我们看到,th的输入e IC is connected to a small loudspeaker via a small output transformer.
The output of the IC is also connected to a loudspeaker.
A DPDT switch is configured and connected to the two speakers such that the whole circuit works like a two way intercom system.
The connected loudspeakers act as a speech producing devices as well as mics for capturing sound signals for amplification to the other end.
右端扬声器是主机，而另一端连接的扬声器是用于远程安装。
When the switch is positioned toward the talk mode, the master speaker behaves as the mic, and the sound signal is announced and heard over the remote speaker.
When the switch is positioned toward the listen mode, all the conservation that might take place around the remote speaker is transferred and can be heard over the master speaker.
T1只不过是一个小型音频输出变压器，该音频输出变压器可以容易地从市场上采购，较低阻抗的绕组进入扬声器，而具有较高阻抗的侧面连接到IC的输入。
Circuit Diagram
Simple Intercom using Transistors
A simple intercom can be also built using just a couple of transistors as shown below:
有关完整的解释，您可以请参阅本文
what is the switch used in the listen and talk? does this have a mic?
the speaker works both ways, as a loudspeaker as well as a mic
wish I could communicate with some nearby buildings wireless, could you help?
you can do it by using two FM radios and two small FM transitters, tune these at slightly different stations for communicating across them.
How do i get operation intercom with speaker and this circuit is used tda2003?
用TDA2030阶段替换LM380阶段
Have you got a simple circuit for using a couple of those basic speaker mics that the 2-way radios use? They’re available pretty cheap, and contain both a speaker and a mic. The push-to-talk switch could be used to turn on the amp?
Thanks!
John C
我猜你参考了对讲机电路，这是你可以找到一些电路的链接：
//www.addme-blog.com/?s=walkie+talkie