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power supplies

Discussion in 'Electronic Basics' started by [email protected], May 15, 2006.

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  1. Guest

    I would like to connect 2 phones directly to one another and talk thru
    them (without the phone company).

    However, they do not have power supplies, so I need to put power into
    the system somehow. Anyone know the easiest way to do this?
  2. Get 2 9 volt batteries and connectors for them at radio shack and wire them
    in series and also in series with the wires of the phones. they will work
    as you want.
  3. Jasen Betts

    Jasen Betts Guest

    there's a good diagram on

  4. Rich Grise

    Rich Grise Guest

    Connect the two phones in series with a 6V lantern battery, and talk to
    your heart's content:

    Phone --------------------------- Phone
    --------+ +-------------
    | |

    You might have to play with the respective polarities a bit; there might
    be people who would recommend a series resistor, but I haven't done the
    experiment, so I don't know.

    This gives you no signaling facility, but you didn't ask for anything like
    that - you _could_ run the ringer by slapping 90VAC @ 20Hz onto the line,
    (if you don't blow up your battery), but it'd probably be simpler to run
    a whole separate circuit for signaling.

    Good Luck!
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