_____
      /_,-._\
       /:::\             .-----------------------.
      (_____)-----------<  M|I|N|I F|O|N|E T|A|P  >-----------< ezod '06
                         '-----------------------'

            .----------------------------------------------------.
            |               Windsor 2600 Meeting                 |
            | First Friday of the Month, CAW Student Centre, 7PM |
            '----------------------------------------------------'


[ DESCRIPTION ]

This is just a really simple isolated phone tap. I'm sure there's lots of
similar designs out there, but this is the one I built, and this is the one
that works for me. It takes a phone extension in and outputs to the line-in
interface on your sound card via a 1/8" phono jack.


[ SCHEMATIC ]

The audio isolation transformer is of the type you'd find on a typical modem,
so that's probably the best place to score one. The RED and GRN in the
schematic are the phone line inputs, and the ( o ) symbol represents the phono
jack ring and tip.

                            C1     XFMR
                 RED <------)|----.    .--------+---+--( o )
                                   )||(         |   |    |
                                   )||(        [v] [^]   |
                        C2   10K   )||(   10K   |   |    |
                 GRN <--|(--/\/\/-'    '-/\/\/--+---+----'


[ MATERIALS ]

1x 600:600 ohm audio isolation transformer
2x 10Kohm 1/4W resistor
2x 50V 10uF radial capacitor
2x 1N4001 diode
1x 1/8" mono phono jack


                                    Enjoy!

::: mavrinac.com