The Blast Box
Ever want to really make yourself be heard? Ever talk to someone on the
phone who just doesn't shut up? Or just call the operator and pop her
eardrum? Well, up until recently it has been impossible for you to do
these things. That is, unless of course you've got a blast box. All a
blast box is, is a really cheap amplifier, (around 5 watts or so)
connected in place of the microphone on your telephone. It works best
on model 500 AT&T Phones, and if constructed small enough, can be placed
inside the phone.
Usage
Once you've built your blast box, simply connect a microphone (or use
the microphone from the phone) to the input of the amplifier, and
presto. There it is. Now, believe it or not, this device actually
works. (At least on crossbar.) It seems that illinois bell switching
systems allow quite a lot of current to pass right through the switching
office, and out to whoever you're calling. When you talk in the phone,
it comes out of the other phone (again it works best if the phone that
you're calling has the standard western electric earpiece) incredibly
loud. This device is especially good for PBS Subscription drives.
***************************************
* *
* HOW TO BUILD 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 SUSPICOUS, 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 PRTS 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
Phone 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
YOU DON'T WANT IT TO ANSWER WHEN MA BELL
CALLS!
Incidentally, never let it be said that all hackers are literate.
Just knowing thieves.
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