White Box

by Agrajag the Prolonged

Overview
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|                                     |
|     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.                        |
|                                     |
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Instructions
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|                                     |
|     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 miniqture 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 Shqck # 273-1380)           |
|  A standard 8-ohm speaker           |
|  Two 9-volt radio batteries         |
|  Two 9-volt bqttery 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 tha remaining    |
| black lead from first battery clip. |
| You have now finished the power     |
| connection t 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 connested to anything, along |
| with quite a few wires from the     |
| keypqd.  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)                              |
|                                     |
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