87 lines
3.7 KiB
Plaintext
87 lines
3.7 KiB
Plaintext
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:White Box:
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Brought to you by Sirius Cybernetic's BBS
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This article will tell you how to change a normal touch tone keypad
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and convert it to a portable unit. In addition, we give the touch-tone
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frequencies.
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First of all, the tones made by a touch tone telephone are not single
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tones, they are a combination of two tones, making "DTMF" (dual tone
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multi-frequency). The normal tone telephone dials 12 different signals, but
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is capable of dialing 16 different signals (see bulletin on silver boxes).
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The power required by a keypad is about 25 volts, but they will work
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with as little as 15, thereby allowing the use of two 9- volt radio
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batteries. As you may have guessed, they are also designed to operate with
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a telephone type speaker (and phone line), and not the standard 8-ohm
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speaker which needs to be used for adequate volume. To accompolish this,
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we use a matching transformer, this is one of those miniature ones available
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at Radio Shack. Enough of the theory, now for the circuit.
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You will need:
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1. A touch tone keypad
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2. A miniature 1000 to 8 ohm transformer (Radio Shack # 273-1380)
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3. A standard 8-ohm speaker
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4. Two 9-volt radio batteries
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5. Two 9-volt battery clips
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6. A case to put it all in (optional)
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A few construction notes, I suggest that you solder and tape all
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connections. It is also important to read this entire bulletin before
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attempting to construct this.
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First, connect the RED wire of the transformer to either terminal on
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the 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
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battery clip to the black wire of the other battery clip. Now connect the
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the 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 thetouch 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 keypad.
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Connect the BLACK wire from the keypad to the BLUE wire on the transformer.
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Next connect the RED-and-GREEN striped wire from the keypad to the GREEN wire
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on the transformer. The BLACK wire on the transformer should not be
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connected to anything, along with quite a few wires from the keypad. The
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connection of the keypad is now complete. All you have to do is connect two
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nine volt batteries to the battery clips, and you'll be ready to go. You may
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want tomount it in a case for easy portability. Note that the silver box
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modification CAN be made to this unit, allowing complete remote phreaking.
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When none of the buttons are pressed, this unit uses NO power, thereby
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eliminating the need for a power switch, and extending the life of the
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batteries.
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The following tones generated by each button on the 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 not normally
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present (except for silver boxes)
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