132 lines
6.6 KiB
Plaintext
132 lines
6.6 KiB
Plaintext
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*** Solid State Silver Boxes ***
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Ma Bell is not the only one with standards! Just about every
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manufacturer of IC's that generate touch tones has also gone by the 16
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key (8 tone) standard for Touch Tone pads. And it is even easier to
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convert a tone pad that uses an integrated circuit to generate the tones
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than converting a Ma Bell pad!
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It will help immensely if you have the schematic for the pad in
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question, or at least the pin-out diagram of the chip being used.
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Pin-outs can usually be obtained from the manufacturer or from an ECG,
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SK, GE or similiar semiconducter handbook (provided that manufacturer
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makes an equivalent for the chip in your pad). I'll use the Radio Shack
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CEX-4000 tone pad module for an example, even though it is probably
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almost the lousiest one you can buy, it is fairly typical and easily
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available.
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Take a look at the diagram or the pin-out of the chip. You should see
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two groups of pins, the rows tone pins and the column tone pins. These
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will be marked as R1,R2,R3,R4 and C1,C2,C3 (Radio Shack) or or X1,X2,X3
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and Y1,Y2,Y3 etc. on others. At any rate, you should be able to
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distinguish which three pins control the columns and which four control
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the rows. If you're lucky, each group of rows and columns will be
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contiguous. Now look at the column pins, and you'll probably see an
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empty pin right next to them. This is the column pin for the 1633 hz
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tones. These chips usually achieve their switching by connecting a row
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pin with a column pin (that way they can use a very simple keyboard pad,
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unlike Ma Bell's complicated one). So all you have to do is take a SPDT
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switch and a few pieces of wire, cut the trace going the column 3 pin of
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the chip, attach a wire from the chip side of that cut to one end of the
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SPDT switch, a wire from the other side of the cut to the center of the
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SPDT switch, and finally, from the remaining contact on the SPDT switch,
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hook a wire to the previously identified pin C4 (Column 4). Now you have
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a "bank switching arrangement exactly like the one described in the
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previous bulletin for modifying a Ma Bell pad. If you can't get the
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schematics or the pin outs for your chip, don't despair. There is still
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hope for you! You just have to track the connections going from the
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pad's keys to the chip. Chances are you'll find that each row has a
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common trace, and so does each column (for those non-technical folks, a
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trace is a connection etched out on a circuit board). Just follow these
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to the chip, and make your own schematic up. Now take a look for that
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extra pin-- there should be one floating around right next to the column
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pins. It will be not be hooked up to anything else, that is, "hanging
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free". Drill a hole in the side of tonepad's case, and mount your
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switch. Radio Shack sells a nice microminiature switch that works
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excellently! (almost the only good thing I can say about Radio Shack in
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this article)
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Happy Phreaking.....
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Phincerely yours, Number Six.
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This bulletin describes how to take a standard touch tone keypad and
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convert it to a portable unit. In addition, I give the touch tone
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frequencies.
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First of all, the tones generated by a standard touch tone keypad (like
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one on a standard telephone) are not single tones, but a combination of
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two tones for each key pressed. Standard keypads normally generate 12
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tone combinations [NOTE: actually, they are capable of generating 16
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combinations, but normally do not have the extra 4 keys required. For
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more info on this, see the 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
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with a telephone type speaker (and phone line), and not the standard
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8-ohm speaker which needs to be used for adequate volume. To accompolish
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this, we use a matching transformer, this is one of those miniature ones
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available at Radio Shack. Enough of the theory, now for the circuit.
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You will need:
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A touch tone keypad, A miniature 1000 to 8 ohm transformer (Radio Shack
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# 273-1380), A standard 8-ohm speaker, Two 9-volt radio batteries, Two
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9-volt battery clips, 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 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
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battery clip to the black wire of the other battery clip. Now connect
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the the remaining RED wire on the second battery clip to the GREEN wire
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from the touch tone pad. Connect the BLUE wire from the touch tone pad
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to the ORANGE-and-BLACK striped wire from the touch tone pad. To these
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two wires, now connect the remaining black lead from first battery clip.
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You have now finished the power connection to the keypad. Connect the
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BLACK wire from the keypad to the BLUE wire on the transformer. Next
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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
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two nine volt batteries to the battery clips, and you'll be ready to go.
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You may want to mount it in a case of or easy portability. Note that the
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silver box modification CAN be made to this unit, allowing complete
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remote phreaking. When none of the buttons are pressed, this unit uses
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NO power, thereby eliminating the need for a power switch, and extending
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the life of the batteries.
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The following are the frequency combinations generated by each button on
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the keypad.
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KEY FREQ. #1 FREQ. #2
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--- -------- --------
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# 941 1477
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* 941 1209
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0 941 1336
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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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4 770 1209
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5 770 1336
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6 770 1477
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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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A 697 1633
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B 770 1633
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C 852 1633
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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
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normally present (except for silver boxes)
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That's all for now, leave all questions, comments, etc. in a message to me.
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DATA PHONE
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**********
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