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:White Box:
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Brought to you by Sirius Cybernetic's BBS
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 Radio 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 (positive) 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 transformer. The BLACK wire on the transformer should not be
connected to anything, along with quite a few wires from the keypad. The
connection 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 portability. 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