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Alarm Phone dialer

Discussion in 'Beginner Electronics' started by JSW, Jul 10, 2003.

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  1. JSW

    JSW Guest

    Does anybody know where I can find a circuit to build a phone dialer for my
    home alarm?

    Cheers
    JOHN
     
  2. Uncle Wobbly

    Uncle Wobbly Guest

    Mitel do some very useful chips... check out the 88xx series of DTMF
    transcievers. They are really easy to interface to.

    I used the 8888 & later the 8885 in a call router controlled by a PIC

    worked absolutely brilliantly.

    You would need a 600R 1:1 matching transformer and a small relay in series
    across the telephone line to provide the loop and carry audio.
     
  3. Dan Fraser

    Dan Fraser Guest

    Radio Shack sells one for $100.00. Never waste time building what you
    can buy off the shelf for a tolerable price.

    On the other hand, I'm prototyping a DSP for a pro audio system but then
    we will be selling 100 a month of them. if not more.

    --
    Dan Fraser

    From Costa Mesa in sunny California
    949-631-7535 Cell 714-420-7535

    Check out my electronic schematics site at:
    http://www.schematicsforfree.com
    If you are into cars check out www.roadsters.com
     
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