120 lines
4.5 KiB
Plaintext
120 lines
4.5 KiB
Plaintext
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___________________________________
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| How to build a BLACK BOX |
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| (Also known as a mute box) |
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\___________________________________/
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To all who dare --
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What is a BLACK BOX? A BLACK BOX is a device that is hooked up to your
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fone that fixes your fone so that when you get a call, the caller doesn't get
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charged for the call. This is good for calls up to 1/2 hour, after 1/2 hour
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the Fone Co. gets suspicious, and then you can guess what happens.
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The way it works:
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What this little beauty does is keep the line voltage from dropping to 10v
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when you answer your fone. The line is instead kept at 36v and it will make
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the fone think that it is still ringing while your talking. The reason for
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the 1/2 hour time limit is that the Fone CO. thinks that something is wrong
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after 1/2 an hour of ringing.
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All parts are available at Radio Shack. Using the least possible parts
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and arrangement, the cost is $.98. And that is parts for two of them! Talk
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about a deal! If you want to splurge then you can get a small PC board, and
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a switch. There are two schematics for this box, one is for most normal
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fones. The second one is for fones that don't work with the first. It was
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made for use with a Bell Trimline touch tone fone.
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** Schematic 1 for most fones **
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** LED ON = BOX ON **
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FROM >--------------------GREEN-> TO
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LINE >--! 1.8k LED !---RED--> FONE
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!--/\/\/\--!>--!
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! !
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------>/<-------
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SPST
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Parts: 1 1.8k 1/2 watt resistor
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1 1.5v LED
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1 SPST switch
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You may just have two wires which you connect together for the switch.
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** Schematic 2 for all fones **
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** LED ON = BOX OFF **
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FROM >---------------GREEN-> TO
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LINE >------- ---RED--> FONE
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! LED !
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-->/<--!>--
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! !
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---/\/\/---
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1.8k
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Parts: 1 1.8k 1/2 watt resistor
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1 1.5v LED
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1 DPST switch
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Here is the PC board layout that I recommend using. It is neat and is very
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easy to hook up.
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Schematic #1 Schematic #2
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************** ****************
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* * * ------- *
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* --<LED>--- * * ! ! *
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* ! ! * * ! <SWITCH> *
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* RESISTOR ! * * ! ! ! *
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* ! ! * * ! ! / *
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* -------- ! * * ! ! \ *
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* ! ! * * ! <LED>! / *
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* --SWITCH-- * * ! ! \ *
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* ! ! * * ! ! / *
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* ! ! * * ! ! ! *
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* ! ! * * ! !-! *
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***!******!*** ***!********!***
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*** These last few lines were inserted by hypothesis! --- The Director ***
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Once you have hooked up all the parts, you must figure out what set of
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wires go to the line and which go to the fone. This is because of the fact
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that LED's must be put in, in a certain direction. Depending on which way
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you put the LED is what controls what wires are for the line & fone.
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How to find out:
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Hook up the box in one direction using one set of wires for line and the
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other for fone.
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*NOTE* For Model I switch should be OFF.
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*NOTE* For Model ][ switch should be set to side connecting the LED.
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Once you have hooked it up, then pick up the fone and see if the LED is
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on. If it is, the LED will be lit. If is doesn't light then switch the wires
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and try again. Once you know which are which then label them.
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*NOTE* - If neither directions worked then your switch was in the wrong
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position. Now label the switch in its current position as BOX ON.
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How to use it:
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The purpose of this box is not to people who call you so it would make
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since that it can only be used to receive calls. When the box is *ON* then
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you may only receive calls. Your fone will ring like normal and the LED on
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the box will flash. If you answer the fone now, then the LED will light and
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the caller will not be charged. Hang up the fone after you are done talking
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like normal. You will not be able to get a dial-tone or call when the box is
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on, so turn the box *OFF* for normal calls. I don't recommend that you
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leave it on all the time, as you don't want it to answer when Ma Bell calls!
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