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power supplies

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?
 
J

James Thompson

Jan 1, 1970
0
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?
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.
 
J

Jasen Betts

Jan 1, 1970
0
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?

there's a good diagram on howstuffworks.com

Bye.
Jasen
 
R

Rich Grise

Jan 1, 1970
0
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?

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


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

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!
Rich
 
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