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BLUE5.TXT
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1994-07-17
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(>---------------------------------------------------------------------------<)
The LOD/H Technical Journal: File #6 of 12
+--------------------------------+
| Building Your Own Blue Box |
+--------------------------------+
|By|
|Jester Sluggo|
|Released: Nov. 27, 1986 |
+--------------------------------+
This Blue Box is based on the Exar 2207 Voltage Controlled Oscillator.
There are other ways to build Blue Boxes, some being better and some not as
good, but I chose to do it this way. My reason for doing so: because at the
time I started this project, about the only schematic available on BBS's was
the one written by Mr. America and Nickie Halflinger. Those plans soon (in
about 90 seconds) became very vague in their context with a couple in-
consistencies, but I decided to "rough it out" using those plans (based on the
Exar 2207 VCO) and build the Blue Box using that as my guide. During the
construction of the Blue Box, I decided to type-up a "more complete and clear"
set of Blue Box schematics than the file that I based mine on, in order to help
others who may be trying/thinking of building a Blue Box. I hope these help.
Note: You should get a copy of the Mr. America/Nickie Halflinger Blue Box
plans. Those plans may be of help to anyone who may have difficulty
understanding these plans. Also, these plans currently do not support CCITT.
+---------------------------------+
| Why should I build a Blue Box ? |
+---------------------------------+
Many of you may have that question, and here's my answer. Blue Boxing was
the origin of phreaking (excluding whistling). Without the advent of Blue
Boxes, I feel that some of the advances in the telecommunications industry
would've taken longer to develop (The need to stop the phone phreaks forced
AT+T Bell Laboratories to "step up" their development to stop those thieves!).
There is no harm in building a Blue Box (except the knowledge you will
gain in the field of electronics). Although there are software programs (Soft
Blue Boxes) available for many micro's that will produce the Blue Box
Multi-Frequency (MF) tones, they are not as portable as an actual Blue Box (you
can't carry your computer to a telephone, so you must use it from home which
could possibly lead to danger).
Many phreaks are announcing the end of the Blue Box Era, but due to
discoveries I have made (even on ESS 1A and possibly ESS 5), I do not believe
this to be true. Although many people consider Blue Boxing "a pain in the
ass", I consider Blue Boxing to be "phreaking in its' purest form". There is
much to learn on the current fone network that has not been written about, and
Blue Boxes are necessary for some of these discoveries. The gift of free fone
calls tends to be a bonus.
Note: Blue Boxes also make great Christmas gifts!
+---------------------------------------+
| Items needed to construct a Blue Box. |
+---------------------------------------+
Here is the list of items you will need and where you can get them. It
may be a good idea to gather some of the key parts (the chips, and especially
the potentiometers, they took about 6 months to back order through Digi-key. A
whole 6 fucking months!) before you start this project. Also, basic
electronics tools will be necessary, and you might want to test the circuit on
a bread board, then wire-wrap the final project. Also, you will need a box of
some sort to put it in (like the blue plastic kind at Radio Shack that cost
around $5.00).
Note: An oscilliscope should be used when tuning in the
potentiometers because the Bell system allows
only a 7-10% tolerance in the precision of the
frequencies.
Qty. ItemPart No.Place
---------------------------------------------------
1 | 4 x 4 Keypad|| Digi-Key
6 | Inverter Chip| 74C04|
32 | Potentiometer||
1 | 4-16 Converter Chip| 74LS154|
1 | 16 Key Decoder| 74C922|
2 | 2207 VCO| XR2207CP | Exar Corp.
3 | .01 uf Capacitor | 272-1051 | Radio Shack
5 | .1 uf Capacitor | 272-135| Radio Shack
2 | 1.5K Ohn Resistor || Radio Shack
2 | 1.0K Ohm Resistor || Radio Shack
1 | Speaker|| From an old Autovon fone.
1 | 9 Volt Battery|| Anywhere
The resistors should be a +/- 5% tolerance.
The speaker can be from a regular telephone (mine just happened to be from
an old Autovon phone). But make sure that you remove the diode.
The Potentiometers should have a 100K Ohm range (but you may want to make
the calculations yourself to double check).
The 9-volt battery can be obtained for free if you use your Radio Shack
Free Battery Club card.
The Exar 2207 VCO can be found if you call the Exar Corp. located in
Sunnyvale, California. Call them, and tell them the state you live in, and
they'll give the name and phone number to the distributor that is located
closest to you. The 2207 will vary from about $3.00 for the silicon-grade
(which is the one you'll want to use) to about $12.00 for the high-grade
Military chip.
Note: When you call Exar, you may want to ask them to send you the
spec-sheets that gives greater detail as to the operation and construction of
the chip.
+-------------------+
| Schematic Diagram |
+-------------------+
+--------------++-------------+
| 1 2 3 A || Figure #1 |
| 4 5 6 B |+-------------+
| 7 8 9 C || Logic Side |
| * 0 # D |+-------------+
++-+-+-+-+-+-+-+
1 | 3 | 5 | 7 |(VCC)
| 2 | 4 | 6 | 8(+5 Volts) +----+
| | | < u | | |[+]| _|_
| | | | | | | ||| \_/GND
+--+-+-+-+-+-+-+-+----++--+----------+---+
| 2 | 11| 10| 7 | || 147 |
(.01C) | | 3 | 4 | 8 | 1 12+------+1|
+--||---+513+------+2 (*74C04*) |
_|_||||
\_/GND |(*74C922*)|+-----------------+
+--||-+6|
|(.1C)||
_|_ ||
\_/GND | 9 17 16 15 14 18|
+--+--+--+--+--+---+--+
| | | | | |
_|_ A B C D |
GND\_/ | | | | [+] (VCC)[+] (VCC)
| | | |(+5 volts) | (+5 volts)
| | | ||
-------+--+--+--+------------------+-----------------
|23 22 21 202418+-+
+-----+12| +--+
||(*74LS154*)19+-+ _|_
_|_ || \_/
\_/GND | 1 2 3 4 5 6 7 8 9 10 11 13 14 15 16 17 | GND
+--+--+--+--+--+--+--+--+--+-+--+--+--+--+--+--+----+
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16
| | | | | | | | | | | | | | | |
| (Connects)
| +---------->
+------------------------+ | (Figure 2)
|+--++-------+
|| ||
+--+-------+--+-------+---+
| 3--|>o--4 5--|>o--6 |
| (Invtr.) (Invtr.) |
+---------------+7|
_|_|(*74C04*)|
GND\_/ (VCC) [+]--+14|
(+5 volts) ||
+-------------------------+
+-------------+_
| Figure #2 |/ |
+---+-------------+----++----------------+ |
| Tone Generation Side |_|_| | SPKR
+----------------------+GND\_/ +---+--+---+ |
| |\_|
| |
| | +---------------+
+-------+| | ||
|_|_| +--+14|
|\_/GND|| (Repeat of) |
||| (First) |
----- (.1C)|| (Circuit) |
-----|||
||| (*XR2207CP*) |
|+-----------------+ | +--+6|
||| | | ||
[+]-----+-------+114+--+ | +---------------+
(VCC)||+--------------------+
(+9 Volts) +----+2||
| |12+---------------------+|
(.01C) ----- ||_|_ |
----- | (*XR2207CP*) |\_/GND |
| ||1.5K Ohms|
+----+311+---+---\/\Rx/\/---+--+|
|| || _|_ |
|| +---\/\Rx/\/---+ \_/GND |
||1.0K Ohms|
|10+----+|
+-------------+69+----+---+|
||8+----+ ||
|||----- (.1C)|
|+-----------------+-----|
+---------+_|_+----------+
|| Pot.GND\_/ Pot. ||
|\/\/\/\/--+-----------------------\/\/\/\/|
|1400 Hz. |1600 Hz.|
+---------+|+----------+
|| Pot. |Pot. ||
|\/\/\/\/--+----------------+------\/\/\/\/|
|1500 Hz. ||900 Hz.|
||||
|14 more||14 More|
| Potentiometers ||Potentiometers |
|in this||in this|
| area left out ||area left out|
| for simplicity ||for simplicity |
||||
||||
|
(Connects) |
<-------------+
(Figure 1)
+-------------------------+
| Multiplex Keypad System |
+-------------------------+
First, the multiplex pattern used in the 4x4 keypad layout. I suggest that
keys 0-9 be used as