I have a schematic for a fone line emulator somehwere.. you can press a
button to make it ring and a few other things.. a bit complex and the
parts are estimated at around $100.
However, if you can force the linux box to answer and the micro to go into
term mode, you can use 2 9V batteries in series on one side of a phone
wire going between the modems.
Kevin
On Wed, 1 Dec 1999, Arfon Gryffydd wrote:
> First, Thanks to all who have helped so far...
>
>
> I have some old modems (TRS-80, acoustic and etc.) which I would like to
> use (flashing LEDs are cool) so, I want to build a little telco emulator to
> interface with the modems in one of my Linux boxes.
>
> I figure an LM556 for the dial tone... A tone decoder for dialing... Not
> sure an easy way to decode pulse dialing.
>
> As for ring... I am thinking using two charged capacitors and switching
> them. That's the first method I came up with to limit the current cheaply.
>
> Any suggestions? I'd like to do this for less that $25.00.
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Received on Sat Dec 04 1999 - 16:29:18 GMT