Need to build a talk back PA system

Discussion in 'General Electronics Chat' started by Seawrath, Dec 4, 2018.

  1. Seawrath

    Thread Starter New Member

    Dec 4, 2018
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    I work outside random concrete buildings and need to communicate to people inside. Radios don’t work. cell phones are spotty. So I want to run a loudspeaker inside on a 2 or 4 wire cable and be able to talk to them like a PA system but I want them to be able to push a button and talk back through the loudspeaker preferably or a mic. there may be something I could buy already built. but can’t find one. I’m not sure what this system is called either. I’m looking for components and a circuit diagram I could use. Any help or ideas would be appreciated
     
  2. spinnaker

    AAC Fanatic!

    Oct 29, 2009
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  3. spinnaker

    AAC Fanatic!

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    I would not give up on the 2 way radio idea. It would be far more convenient than an intercom. Repeaters can be set up to fix poor reception issues.

    https://www.ebay.com/itm/192636705514
     
  4. Seawrath

    Thread Starter New Member

    Dec 4, 2018
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    The intercom is exactly what I was looking for. But yeah way to pricey. Thought I could make one if I could see a circuit diagram. Wouldn’t know how to start otherwise.
    The repeater route is interesting. I suppose I’d just set one up in the doorway? Don’t know enough about radios.. Wonder if it works on any band like marine band.
     
  5. spinnaker

    AAC Fanatic!

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    Trying to make one that would be reliable and resilient in an outdoor industrial enviroment is a tall task. There is a reason the commercial grade intercoms are expensive as they are.

    Again expensive but the prudent thing to do is to hire a consultant that specializes in remote two way communication. They will be able to suggest the best solution based on your enviroment.
     
  6. sghioto

    Well-Known Member

    Dec 31, 2017
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    One possible 2 wire intercom arrangement using mics and push buttons.
    SG
    EEE Intercom BD.PNG
     
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