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  • Simple Intercom From a Pair of Old Corded Phones

    Hello. I successfully hooked up two old rotary phones together by using a 9v battery between them. Now, will using 9v with no resistors harm the phones in any way either in short time use or long term use? I can use 6v if that is better.Another question: Inside the phone wire there are three wires; red, blue and white. I found out that white is (-) and red is (+). I am unsure what the blue one does. Do you know if there is any signal output when phone 1 is lifted off? I wanted to hook it up so that a 12v buzzer sounds(next to phone 2) when the handle of phone 1 is lifted off. Maybe the third wire gives power when the phone is lifted off?

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