Date   : Tue, 23 Mar 2010 12:29:57 +0000
From   : rs423@... (Mick Champion)
Subject: [OT] ADSL capabilities

On 23/03/2010 03:24, Rick Murray wrote:
> On 22/03/2010 09:49, Rob wrote:
>
>    
>> I used to get the cheap and dumb modems to dial by
>> toggling them oflfine and online very quickly, too...
>>      
> ROTFL! :-)
>
>
> On a more serious note, I wonder if anybody has designed a little
> PIC-like thingy to hook on to a phone line to intercept pulse dials and
> emit tones. I guess it'd be a little more complex than it sounds because
> of a need to pass traffic on the line whilst insulating the real line
> from the behaviour of the pulse signalling.
>    

They do exist.
If you've got a spare $50!
http://www.dialgizmo.com/

There's more on this topic including a circuit diagram on post 5.
http://www.vintage-radio.net/forum/showthread.php?t=14950
The circuit diagram goes to a PIC to control a  HT9200A DTMF generator, 
- not much use without the PIC code, but you could post the chap and ask 
for it nicely. Looks simple to build. If I could find it in  a DIL 
package rather than SMD, I'd have a go myself, so far I've found a 16 
pin DIL HT9200B. This allows use of a matrix as well as a data input.


Cheers,


Mick