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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
each 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

0	941		1336
#	941		1477
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