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TELEPHONE RELATED
ELECTRONIC CONSTRUCTION PLANS
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#2000 TELEPHONE HOLD BUTTON PLANS
Add the telephone option Ma Bell doesn't make available on home telephones. Put any
incoming call on hold with the push of a button. Red LED shows when party is still there.
Easy to build and install. No battery necessary, takes its power directly from phone line.
PLANS ONLY KIT #2000POK . . . . . . . . . . . . . . . . . .
. . . $1.00
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#2001 TELEPHONE AMPLIFIER PLANS
Uses an induction pick up coil amplifier and speaker to pick up and amplify telephone
conversations. Great for hands free telephone operation or when you are put on hold.
Plastic case included.
PLANS ONLY KIT #2001POK . . . . . . . . . . . . . . . . . .
. . . $4.95
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#2002 "FREE" TELEPHONE MESSAGES PLANS
With this device you can beat Ma Bell. With this device on your telephone,
messages may be given between rings of the telephone. Tell people you are not home, when
to call back, etc. Similar to an answering system except caller is not charged for the
call because the phone is left on the hook.
PLANS ONLY KIT #2002POK . . . . . . . . . . . . . . . . . .
. . . $9.95
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#2003 TEENAGE TELEPHONE ALARM PLANS
Limit those teenage telephone calls. This solid state device attaches to
the telephone line. It emits a single warning tone at the end of 8 minutes of conversation
and gives a continuous tone at the end of 10 minutes. The continuous tone prevents further
conversation.
PLANS ONLY KIT #2003POK . . . . . . . . . . . . . . . . . .
. . . $4.95
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#2004 TELEPHONE HOLD BUTTON PLANS
The option Ma Bell left off her phones. Add this hold button circuit to
any phone. A flashing LED will signal that the caller is on hold. Special security feature
will cause the LED to flash faster if another phone is picked up on line.
PLANS ONLY KIT #2004POK . . . . . . . . . . . . . . . . . .
. . . $4.95
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#2005 DIALED DIGIT DISPLAY PLANS
An all IC device which displays the digits of any telephone number dialed.
Reduce wrong number dialing. Makes a fascinating project.
PLANS ONLY KIT #2005POK . . . . . . . . . . . . . . . . . .
. . . $4.95
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#2006 TELEPHONE "BLUE" BOX PLANS
Unscrupulous persons have used a telephone "blue" box to obtain free long
distance telephone calls. These plans are presented for educational advancement only and
any use for illegal purposes is strictly forbidden. These plans and/or PC board are for
experimentation only and for no other purpose.
PLANS ONLY KIT #2006POK . . . . . . . . . . . . . . . . . .
. . . $9.95
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#2007 TELEPHONE "RED" BOX PLANS
The "red" box is another telephone device that some dishonest
people have used to obtain free telephone calls from pay phones. Just another example of
experimenting with Tone Burst Generators. These plans and/or PC board are presented for
educational purposes only and any use for illegal purposes is strictly forbidden.
PLANS ONLY KIT #2007POK . . . . . . . . . . . . . . . . . .
. . . $9.95
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#2008 TELEPHONE MEMORY DIALER PLANS
These plans show how to construct a push-button telephone dialer
attachment using only 3 IC's; and which has the capacity to store 32 8-digit phone
numbers. Numbers are automatically dialed by pushing only 2 buttons. The unit can be
attached to any type of telephone: push-button or rotary dial. Options are shown for
either tone or pulse output, and for LED display of the number being dialed. The unit also
features one-button re-dial of the last number called. Compares to units costing over
$100.00.
PLANS ONLY KIT #2008POK . . . . . . . . . . . . . . . . . .
. . . $8.00
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