Re: circuit needed

On Fri, 1 Jul 2005 20:44:07 -0400, "cowboy" <me@xxxxxxxxxxx> wroth:

>I need a little circuit to adapt an ordinary telephone to play computer wav
>files over the line.
>
>assume a standard conventional corded telephone in the USA, and a typical
>Windows XP computer with a typical sound card. Also, how would this work
>with a typical cordless telephone?
>

A 600 Ohm 1:1 transformer is all you need. You could buy one or tear
apart an old defunct modem to get one.

One winding connects to the soundcard "line out" and the other winding
goes in series with the phone line between the wall plug and the phone you're
going to be using.

The transformer is needed to prevent lots of hum on the line and/or
interfering with the normal operation of the phone.

It shouldn't make any difference whether the phone is cordless or not.

Jim


James P. Meyer
http://home.att.net/~notjimbob
.

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