Found this easily enough
http://www.maxim-ic.com/appnotes.cfm/appnote_number/85/ln/en

On Wed, Sep 17, 2003 at 12:35:24PM -0400, Art wrote:
> I can't offer any additional comments regarding the actual quan of
> elections you can capture:>:
>
> But, Maxim has a ready to go power supply that is designed specifically for
> this purpose and there is lots of tech-talk in the Ap Note regarding the
> phone lines.
>
> I don't remember the name of the Ap Note, but you should be able to find it
> easily. I think they were talking about some real power and the power
> supply did the conversion to a lower voltage at the same time.
>
> Good Luck.
>
> Art
>
>
>
> At 10:54 AM 9/17/03 -0500, you wrote:
> >At 03:50 AM 9/18/2003 +1200, Russell McMahon wrote:
> >
> >>> >> Does anyone have any idea how much power you could tap from
> >>> >> the line without causing it to go off hook?
> >>> >
> >>> >The phone companies have some definite ideas about this :-)
> >>>
> >>> 3ma is allowed.
> >>> in the real world, your on-hook voltage can be as low as 12v, though
> >this
> >>would be a rare case.
> >>
> >>
> >>I'm not saying that that isn't true.
> >>I've been out of the formal telcom field for a decade or so now.
> >
> >garrgh...
> >my brain said 3ua, and my fingers said 3ma....
> >
> >--
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--
Charles Anderson        caa at columbus dot rr dot com

No quote, no nothin'

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