Newsgroups: sci.electronics.misc
Subject: Re: Phone line emulation
References: <[email protected]>
From: Tomi Holger Engdahl 
Date: 15 Jul 1999 16:05:30 +0300
Message-ID: 
Organization: Helsinki University of Technology, Finland
Lines: 23
X-Newsreader: Gnus v5.3/Emacs 19.34
"Ernest Bosch"  writes:

> I need to emulate a phone call, for a theater performance. I have a terminal
> and I woul like to emulate the phone line.

Everything you need to do this your self can be found at
http://www.hut.fi/Misc/Electronics/telephone.html

On that page you will find the technical information
(http://www.hut.fi/Misc/Electronics/telephone.html#how) and circuita
(http://www.hut.fi/Misc/Electronics/telephone.html#circuits)


> I would like to know what is the voltage that I shoul apply to the line AC,
> DC ?

A voltage in range if 40-90 V AC at 20-25 Hz frequency will ring telephones
nicely. Many modern telephones will also ring licely on 50 Hz or 60 Hz,
but the tone might be changed a little bit.

-- 
Tomi Engdahl (http://www.iki.fi/then/)
Take a look at my electronics web pages at http://www.hut.fi/Misc/Electronics/