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white.txt
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1998-07-29
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4KB
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97 lines
---------
White Box
---------
This article will tell you how to change a normal touch tone
keypad and convert it to a portable unit. In addition, we give
the touch-tone frequencies.
First of all, the tones made by a touch tone telephone are not
single tones, they are a combination of two tones, making "DTMF"
(dual tone multi-frequency). The normal tone telephone dials 12
different signals, but is capable of dialing 16 different signals
(see bulletin on silver boxes).
The power required by a keypad is about 25 volts, but they will
work with as little as 15, thereby allowing the use of two 9-
volt radio batteries. As you may have guessed, they are also
designed to operate with a telephone type speaker (and phone
line), and not the standard 8-ohm speaker which needs to be used
for adequate volume. To accompolish this, we use a matching
transformer, this is one of those miniature ones available at Ra-
dio Shack. Enough of the theory, now for the circuit.
You will need:
1. A touch tone keypad
2. A miniature 1000 to 8 ohm transformer
(Radio Shack # 273-1380)
3. A standard 8-ohm speaker
4. Two 9-volt radio batteries
5. Two 9-volt battery clips
6. A case to put it all in (optional)
A few construction notes, I suggest that you solder and tape all
connections. It is also important to read this entire bulletin
before attempting to construct this.
First, connect the RED wire of the transformer to either terminal
on the speaker. Now connect the WHITE wire from the transformer
to the other terminal on the speaker. Next, connect the RED (po-
sitive) wire of one battery clip to the black wire of the other
battery clip. Now connect the the remaining RED wire on the
second battery clip to the GREEN wire from the touch tone pad.
Connect the BLUE wire from the touch tone pad to the ORANGE-and-
BLACK striped wire from thetouch tone pad. To these two wires,
now connect the remaining black lead from first battery clip. You
have now finished the power connection to the keypad. Connect the
BLACK wire keypad. Connect the BLACK wire from the keypad to the
BLUE wire on the transformer. Next connect the RED-and-GREEN
striped wire from the keypad to the GREEN wire on the transform-
er. The BLACK wire on the transformer should not be connected to
anything, along with quite a few wires from the keypad. The con-
nection of the keypad is now complete. All you have to do is
connect two nine volt batteries to the battery clips, and you'll
be ready to go. You may want tomount it in a case for easy porta-
bility. Note that the silver box modification CAN be made to this
unit, allowing complete remote phreaking.
When none of the buttons are pressed, this unit uses NO power,
thereby eliminating the need for a power switch, and extending
the life of the batteries.
The following tones generated by each button on the keypad.
KEY FREQ. #1 FREQ. #2
--- -------- --------
1 697 1209
2 697 1336
3 697 1477
A 697 1633
4 770 1209
5 770 1336
6 770 1477
B 770 1633
7 852 1209
8 852 1336
9 852 1477
C 852 1633
* 941 1209
0 941 1336
# 941 1477
D 941 1633
All frequencies are measured in Hertz Note that A,B,C and D are
not normally present (except for silver boxes)
+++EOF