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    dan grant's Avatar
    dan grant Posts: 1, Reputation: 1
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    #1

    Jun 13, 2012, 09:29 AM
    Old Phone Wiring
    How can I wire two push button phones to each other so I can talk at one phone and hear the voice at the second phone as well as talk back to the first phone from the second phone? I heard that I could use a 9 volt battery as the power source. The phones are to be used in a first aid event and there will be no electricity available other then a battery.
    ebaines's Avatar
    ebaines Posts: 12,131, Reputation: 1307
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    #2

    Jun 13, 2012, 09:52 AM
    Here's a site that shows it can be done using a 12-volt battery and a 680-ohm resistor. It also claims that a 9-volt battery would work as well, but I suggest you should test it to make sure the battery will last long enough for your event.

    Using old phones as an intercom in your VW bus (or anywhere else) - Hack a Day
    Stratmando's Avatar
    Stratmando Posts: 11,188, Reputation: 508
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    #3

    Jun 14, 2012, 06:23 PM
    Here are 2 Very Good Ones,
    More money, nut more features, I have good luck with Viking:
    Viking Electronics Telecom & Security Products

    These are good for 2.6 miles? Kind of Handy
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