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2 phone Intercom circuit diagram which can be used upto 1km in outdoor using ringer

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ghaudesh

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I want to build a 2 phone intercom which can be used upto 1km using speaker of same phone to create ring on other side please help
 

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    Suresh Ravel

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    I want to build a 2 phone intercom which can be used upto 1km using speaker of same phone to create ring on other side please help....
See here similar project:


http://www.instructables.com/id/Old-Phone-Intercom-Device/

---------- Post added at 18:16 ---------- Previous post was at 18:12 ----------
intercom.gif


http://www.diy-electronic-projects.com/p313-High-Quality-Intercom



intercom-circuit-diagrams.JPG


http://www.afiata.com/full-duplex-intercom-pcb-for-your-office-and-house/
 
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    dselec

    dselec

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Does any one know how to design a door video intercom?
 

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