home *** CD-ROM | disk | FTP | other *** search
- White Box Plans
- (Uploaded by The Mystic)
-
- 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:
-
- A touch tone keypad
- A miniature 1000 to 8 ohm transformer (Radio Shack # 273-1380)
- A standard 8-ohm speaker
- Two 9-volt radio batteries
- Two 9-volt battery clips
- 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 the touch 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 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 to mount 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 are the frequency combinations 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)
-
- Downloaded From P-80 Systems 304-744-2253
-