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Home » Mini Projects » Simple Intercom Network Circuit

Simple Intercom Network Circuit

Last Updated on November 11, 2019 by Swagatam 8 Comments

The article presented below describes a very simple intercom system which can be built and installed at any required place very cheaply. The circuit utilizes just a single IC and a very few other components for the entire assembly.

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:

However this chip is even better as it requires very few external components for implementing the amplifier actions.

In the diagram we see that the input of the 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.

The right end speaker is the master while the speaker connected at the other end is for remote installation.

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 is nothing but a small audio output transformer which may be easily procured from the market, the winding with lower impedance goes to the speaker while the side with the higher impedance gets connected to the input of the IC.

Circuit Diagram

simple intercom circuit using op amp IC LM380

Simple Intercom using Transistors

A simple intercom can be also built using just a couple of transistors as shown below:

transistorized intercom circuit

For complete explanation you can refer to this article

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About Swagatam

I am an electronic engineer (dipIETE ), hobbyist, inventor, schematic/PCB designer, manufacturer. I am also the founder of the website: https://www.homemade-circuits.com/, where I love sharing my innovative circuit ideas and tutorials.
If you have any circuit related query, you may interact through comments, I'll be most happy to help!

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  1. Khien Gross says

    what is the switch used in the listen and talk? does this have a mic?

    Reply
    • Swagatam says

      the speaker works both ways, as a loudspeaker as well as a mic

      Reply
  2. thecomputerangelcrew says

    wish I could communicate with some nearby buildings wireless, could you help?

    Reply
    • Swagatam says

      you can do it by using two FM radios and two small FM transitters, tune these at slightly different stations for communicating across them.

      Reply
  3. Zay Yar says

    How do i get operation intercom with speaker and this circuit is used tda2003?

    Reply
    • Swagatam says

      replace the LM380 stage with TDA2030 stage

      Reply
  4. John C says

    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

    Reply
    • Swagatam says

      I guess you are referring to walkie-talkie circuits, here’s the link where you can find a few of those circuits:

      https://www.homemade-circuits.com/?s=walkie+talkie

      Reply

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