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Newbie: Looking for Phone Interface Schematics---Others — Parallax Forums

Newbie: Looking for Phone Interface Schematics---Others

ArchiverArchiver Posts: 46,084
edited 2002-03-25 22:31 in General Discussion
Hi,

I'm new to this newsgroup and am in the process of building a
telephone line monitor. I need to detect RING, then isolate it
through an opto-isolator to my Stamp. Where could I find
suggested interface schematics for this. Also, where are other
non-Parallax source for other interfaces?

Thanks in Advance....

Larry Woods

Comments

  • ArchiverArchiver Posts: 46,084
    edited 2002-03-24 16:00
    There are a few things here

    ftp://ftp.qunos.net/incoming/Phone_stuff/

    Original Message
    From: "Larry Woods" <larry@l...>
    To: "Stamps" <basicstamps@yahoogroups.com>
    Sent: March 24, 2002 7:46 AM
    Subject: [noparse][[/noparse]basicstamps] Newbie: Looking for Phone Interface
    Schematics---Others


    Hi,

    I'm new to this newsgroup and am in the process of building a
    telephone line monitor. I need to detect RING, then isolate it
    through an opto-isolator to my Stamp. Where could I find
    suggested interface schematics for this. Also, where are other
    non-Parallax source for other interfaces?

    Thanks in Advance....

    Larry Woods


    To UNSUBSCRIBE, just send mail to:
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  • ArchiverArchiver Posts: 46,084
    edited 2002-03-24 16:33
    A neon bulb, a resistor, a piece of heat shrink and a photocell or
    phototransistor makes a good ring indicator. The ring signal is about a 90
    volt / 20 Hz signal sent up the phone line. This makes the neon bulb flash,
    which is picked up by the photocell or phototransistor. The photocell or
    phototransistor is tied to a Stamp pin.

    Just be sure to monitor your pin long enough to avoid false rings from line
    spikes.

    You could also find a schematic of a modem or cheaply phone and look to see
    how they do it.
    Original Message

    > I'm new to this newsgroup and am in the process of building a
    > telephone line monitor. I need to detect RING, then isolate it
    > through an opto-isolator to my Stamp. Where could I find
    > suggested interface schematics for this. Also, where are other
    > non-Parallax source for other interfaces?
  • ArchiverArchiver Posts: 46,084
    edited 2002-03-24 17:23
    You could use the Ring Indicator line from an old (but working) modem. This
    will give you a _legal_ physical connection to the phone line (DAA - data
    access arrangement). Keep in mind that the telephone companies don't like us
    connecting non-legal devices, so be careful if you hack your own.

    -- Jon Williams
    -- Parallax


    In a message dated 3/24/02 9:46:18 AM Central Standard Time, larry@l...
    writes:


    > I'm new to this newsgroup and am in the process of building a
    > telephone line monitor. I need to detect RING, then isolate it
    > through an opto-isolator to my Stamp. Where could I find
    > suggested interface schematics for this. Also, where are other
    >




    [noparse][[/noparse]Non-text portions of this message have been removed]
  • ArchiverArchiver Posts: 46,084
    edited 2002-03-24 17:50
    Thanks, Jon.

    Yah, I know that they (phone co.) doesn't like it. That's why I
    am looking for a pretty "clean" interface. My project?
    Detecting Distinctive Ring, then switching the line to either (1)
    a phone, or (2) my computer for a software-fax program. This
    means that I have to interface directly with the phone line vs.
    through a modem control line.

    I am forced into this because Microsoft, in their infinite
    wisdom, has dropped Distinctive Ring support in Windows 2000. It
    was support in Win 95/98---and the software that I was using
    (HotFax) recognized that and only picked up the line on the
    alternative ring.

    (NO RESPONSE EXPECTED)

    Larry Woods


    >
    Original Message
    > From: jonwms@a... [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=3tLPsy9Ry5BX7EbftMVk2MbsmW-UVg38o38hZvBfnCIkxDPO_b69nJduHDecQ-YhdlZr7CyN]jonwms@a...[/url
    > Sent: Sunday, March 24, 2002 10:24 AM
    > To: basicstamps@yahoogroups.com
    > Subject: Re: [noparse][[/noparse]basicstamps] Newbie: Looking for Phone Interface
    > Schematics---Others
    >
    >
    > You could use the Ring Indicator line from an old (but
    > working) modem. This
    > will give you a _legal_ physical connection to the
    > phone line (DAA - data
    > access arrangement). Keep in mind that the telephone
    > companies don't like us
    > connecting non-legal devices, so be careful if you
    > hack your own.
    >
    > -- Jon Williams
    > -- Parallax
    >
    >
    > In a message dated 3/24/02 9:46:18 AM Central Standard
    > Time, larry@l...
    > writes:
    >
    >
    > > I'm new to this newsgroup and am in the process of building a
    > > telephone line monitor. I need to detect RING, then
    > isolate it
    > > through an opto-isolator to my Stamp. Where could I find
    > > suggested interface schematics for this. Also,
    > where are other
    > >
    >
    >
    >
    >
    > [noparse][[/noparse]Non-text portions of this message have been removed]
    >
    >
    > To UNSUBSCRIBE, just send mail to:
    > basicstamps-unsubscribe@yahoogroups.com
    > from the same email address that you subscribed. Text
    > in the Subject and Body of the message will be ignored.
    >
    >
    > Your use of Yahoo! Groups is subject to
    http://docs.yahoo.com/info/terms/
  • ArchiverArchiver Posts: 46,084
    edited 2002-03-25 22:31
    See "The Phone Tester", Bill Stiles, Nuts & Volts, Sept 2001, p. 76.
    Probably available at www.nutsvolts.com . A recommended book in this
    article is: Telephone Repair Illustrated, Stephen J. Bigelow, TAB Books
    (1993).

    Dennis
    Original Message
    From: Larry Woods [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=8dICtNsyE9q_E6uIJTbLQVBRBt5OKqv4j04F45G557kH1uHkITIOEMqwUOlcwHz3UEpyqW2cioZU3g]larry@l...[/url
    Sent: Sunday, March 24, 2002 7:46 AM
    To: Stamps
    Subject: [noparse][[/noparse]basicstamps] Newbie: Looking for Phone Interface
    Schematics---Others


    Hi,

    I'm new to this newsgroup and am in the process of building a telephone
    line monitor. I need to detect RING, then isolate it through an
    opto-isolator to my Stamp. Where could I find suggested interface
    schematics for this. Also, where are other non-Parallax source for
    other interfaces?

    Thanks in Advance....

    Larry Woods


    To UNSUBSCRIBE, just send mail to:
    basicstamps-unsubscribe@yahoogroups.com
    from the same email address that you subscribed. Text in the Subject
    and Body of the message will be ignored.


    Your use of Yahoo! Groups is subject to
    http://docs.yahoo.com/info/terms/
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