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black.txt
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1998-07-29
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5KB
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140 lines
---------
BLACK BOX
---------
------------
Introduction
------------
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 suspi-
cious, and then you can guess what happens.
----------------
The way it works
----------------
What this little beauty does is keep the line voltage from drop-
ping 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 something is wrong after 1/2 an
hour of ringing.
All parts are available Radio Shack. Using the least possible
parts and arrangement, 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 schematic
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 Trimline 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 con-
trols 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 label the switch
in its current position as BOX ON.
-------------
How to use it
-------------
The purpose of this box is not to people who call you so it would
make sense that it can only be used to receive calls. When the
box is *ON* then you may only receive 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 Ma Bell calls!
+++EOF