2 way intercom

[kumar]

Dear members,
Those who wants a simple 2 way intercom with normal telephones with dialling and ringing facility

this simple project comes  from a reputed magazine along with pcb design too....

[enzine]

 
From your pdf :

"TWO-WAY PC-FAX INTERFACE"

"This circuit imitates a small telephone exchange, allowing a PC to dial a fax
machine, and vice versa, without actually making use of the public telephone network.
Very useful if you want to employ your fax as a scanner (switch it to high resolution!), or
as a 200-odd dpi printer. For these applications, it is assumed that you have a fax card in
your PC. The software supplied with this card will then enable you to convert scanned
images into the widely used TIFF format. The circuit shown here is suitable for pulse
dialling only. Fortunately, that is still supported by most fax machines and PC fax cards."

?!?

Ciao

[kumar]

I already made  this circuit many times and works without fail.
Simply connect two normal telephone or wall mounted telephone with K2 & K3 terminal.

[h0nk]

Hello,

simply replace the fax machine and the fax card with two old phones and You are near the solution.
My old Zyxel U-1496E doesnt like the 50/60 Hz anyway.
It needs the real 25 Hz of an old german rington.


Best Regards

[token0]

Also if you have DECT base with two or more handsets: most of models have "int" button, that's the built-in intercom. Cheap and efficient.