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-
- This bulletin describes how to take a standard touch tone keypad and convert it
- to a portable unit. In addition, I give the touch tone frequencies. First of
- all, the tones generated by a standard touch tone keypad (like one on a
- standard telephone) are not single tones, but a combination of two tones for
- weach key pressed. Standard keypads normally generate 12 tone combiNations
-
-
-
- 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 hack. 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 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 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
-