 
                 </>-<\>-</>-<\>-</>-<\>-</>-<\>-</>-<\>
 
                           Black   Box   Plans

                          For Calls from Granma

                 </>-<\>-</>-<\>-</>-<\>-</>-<\>-</>-<\>
 
  To all who dare --
 
     What is a BLACK BOX?   A BLACK BOX is a device that is hooked up to
your fone that fixes your fone so that when you get a call, the caller
doesn't get charged for the call.  This is good for calls up to 1/2 hour,
after 1/2 hour the Fone Co. gets suspicious, and then you can guess what
happens.
 
The way it works:
 
     What this little beauty does is keep the line voltage from dropping
to 10v  when  you answer your  fone.   The line is instead kept at 36v and
it  will make  the  fone think that it is still ringing while your talking.
The reason for the 1/2 hour time limit is that the Fone CO. thinks that
- More (Y)/N/NS? NS
something is wrong after 1/2 an hour of ringing.
 
     All  parts  are  available RadioShack.  Using the least possible parts
and arangement, the cost is $0.98!!!!  And  that  is  parts for two of them!
Talk  about  a deal!  If you want to splurge then  you can get a small PC
board, and a switch.  There are two schematics for this box, one is for most
normal fones. The second one is for  fones  that don't work with the first.
It was made for use with a Bell Trim line touch tone fone.
 
 </>  Schematic 1 for most fones  <\>
 </>         LED ON: BOX ON       <\>
 
FROM >--------------------GREEN->  TO
LINE >--!   1.8k  LED  !---RED--> FONE
        !              !
        ------>/<-------
              SPST
 
 
Parts:  1 1.8k 1/2 watt resistor
        1 1.5v LED
        1 SPST switch
 
You may just have two wires which you connect together for the switch.
 
 
 </>  Schematic 2 for all fones  <\>
 </>        LED ON: BOX OFF      <\>
 
FROM >---------------GREEN->  TO
LINE >-------      ---RED--> FONE
            !  LED !
         -->/<--!>--
         !         !
         ---/\/\/---
             1.8k
 
Parts:  1 1.8k 1/2 watt resistor
        1 1.5v LED
        1 DPST switch
 
 
     Here is the PC board layout that I recommend  using.  It is neat and is
very easy to hook up.
 
   Schematic #1        Schematic #2
 
  **************     ****************
  *            *     *  -------     *
  * --<LED>--- *     *  !     !     *
  * !        ! *     *  ! <SWITCH>  *
  * RESISTOR ! *     *  ! !      !  *
  *        ! ! *     *  ! !      /  *
  * -------- ! *     *  ! !      \  *
  * !        ! *     *  ! <LED>! /  *
  * --SWITCH-- *     *  !      ! \  *
  *  !      !  *     *  !      ! /  *
L *  !      !  * F L *  !      ! !  * F
I>RED-      -RED>O I>RED-      ---RED>O
N>-----GREEN---->N N>-----GREEN------>N
E * h          * E E *              * E
  **************     ****************
 
 
     Once you have hooked up all the parts, you must figure out what set of
wires  go to the line and which go to the fone.  This is because of the fact
that LED's must be put in, in a certain direction.  Depending on which way
you put the LED is what controls what wires are for the line & fone.
 
How to find out:
 
     Hook up the box in one direction using one set of wires for line and
the other for fone.
 
*NOTE* - For Model I switch should be OFF.

*NOTE* - For Model ][ switch should be set to side connecting the led.
 
     Once  you have hooked it up, then pick up the fone and see if the LED
is on.  If it is, the LED will be lit.  If is doesn't light then switch the
wires and try again.  Once you know which are which then label them.

*NOTE* - If neither directions worked then your switch was in the wrong
          position.  Now lable the switch in its current position as BOX ON.

 
How to use it:
 
     The purpose of this box is not  to poeple  who  call you so it would
make sence  that  it  can only  be  used  to receive calls.   When the box
is  *ON* then you may only recieve calls.  Your fone will ring like normal
and the  LED on  the box will flash.  If you answer the fone now, then the
LED will light and the caller will not be charged.  Hang up the fone after
you  are  done talking like normal.  You will not  be able to get a
dial-tone or call when the box is on,  so turn the box *OFF* for normal
calls.  I don't recommend that you leave it on all the time,  as you don't
want it to answer when MaBell calls!
