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-
- ***************************************
- * *
- * How to build a BLACK BOX *
- * *
- ***************************************
-
- 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 insted 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 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
- 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 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 Ma
- Bell calls!
-
- PLEASE NOTE THE BLACK BOX WILL NOT
- FUNCTION UNDER MOST NEWER ESS SWITCHING
- SYSTEMS.....
-
- DOWNLOADED FROM P-80 SYSTEMS 304-744-2253