86 lines
4.0 KiB
Plaintext
86 lines
4.0 KiB
Plaintext
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{{{{{{{{{{{{{{{{|}}}}}}}}}}}}}}}}}}
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Creating Portable Touchtone Keypads
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(White Boxes)
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{{{{{{{{{{{{{{{{|}}}}}}}}}}}}}}}}}}}
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This bulletin describes how to take a s tandard touch tone keypad and convert
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it to a portable unit. In a ddition, I give the touch tone frequencies.
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First of all, the tones generated by a standard touch tone keypad (like one
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on a standard telephone) are not single tones, but a combination of two tones
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for each key pressed. Standard keypads normally generate 12 tone
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combinations, but are capable of generating 16 with a silver box mod.
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The power required by a keypad is about 25 volts, but they will work with as
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little as 15, thereby allowing the use of two 9-volt radio batteries. As you
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may have guessed, they are also designed to operate with a telephone type
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speaker (and phone line), and not the standard 8-ohm speaker which needs to be
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used for adequate volume. To accompolish this, we use a matching transformer,
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this is one of those miniature ones available at Radio Shack. Enough of the
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theory, now for the circuit.
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You will need:
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A touch tone keypad
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A miniature 1000 to 8 ohm transformer (Radio Shack # 273-1380)
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A standard 8-ohm speaker
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Two 9-volt radio batteries
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Two 9-volt battery clips
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A case to put it all in (optional)
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A few construction notes, I suggest that you solder and tape all connections.
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It is also important to read this entire bulletin before attempting to
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construct this.
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First, connect the RED wire of the transformer to either terminal on the
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speaker. Now connect the WHITE wire from the transformer to the other
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terminal on the speaker. Next,connect the RED (positive) wire of one battery
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clip to the black wire of the other battery clip. Now connect the the
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remaining RED wire on the second battery clip to the GREEN wire from the
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touch tone pad. Connect the BLUE wire from the touch tone pad to the
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ORANGE-and-BLACK striped wire from the touch tone pad. To these two wires,
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now connect the remaining black lead from first battery clip. You have now
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finished the power connection to the keypad. Connect the BLACK wire from
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the keypad to the BLUE wire on the transformer. Next connect the RED-and-GREEN
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striped wire from the keypad to the GREEN wire on the transformer. The BLACK
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wire on the transformer should not be connected to anything, along with quite
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a few wires from the keypad. The connection of the keypad is now complete.
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All you have to do is connect two nine volt batteries to the battery clips,
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and you'll be ready to go. You may want to mount it in a case for easy
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portability. Note that the silver box modification CAN be made to this unit,
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allowing complete remote phreaking. When none of the buttons are pressed,
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this unit uses NO power, thereby eliminating the need for a power switch,
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and extending the life of the batteries.
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The following are the frequency combinations generated by each button on the
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keypad.
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KEY FREQ. #1 FREQ. #2
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--- -------- --------
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1 697 1209
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2 697 1336
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3 697 1477
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A 697 1633
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4 770 1209
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5 770 1336
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6 770 1477
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B 770 1633
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7 852 1209
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8 852 1336
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9 852 1477
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C 852 1633
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* 941 1209
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0 941 1336
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# 941 1477
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D 941 1633
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All frequencies are measured in Hertz Note that A,B,C and D are
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not normally present (except for silver boxes)
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-end
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