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|| A Real Functioning PEARL BOX Schematic ||
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|| Written, Tested, and Used ||
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|| by Dispater ||
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|| July 1, 1989 ||
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Introduction: After reading the earlier renditions of schematics
for the Pearl Box, I decided that there was an
easier and cheaper way of doing the same thing
with an IC and parts you probably have just laying
around the house.
What Is A Pearl Box and Why Do I Want One?
A Pearl Box is a tone generating device that is used to make
a wide range of single tones. Therefore, it would be very
easy to modify this basic design to make a Blue Box by
making 2 Pearl Boxes and joining them together in some
fashion.
A Pearl Box can be used to create any tone you wish that
other boxes may not. It also has a tone sweep option that
can be used for numerous things like detecting different
types of phone tapping devices.
Parts List:
CD4049 RCA integrated circuit
.1 uF disk capacitor
1 uF 16V electrolitic capacitor
1K resistor
10M resistor
1meg pot
1N914 diode
Some SPST momentary push-button switches
1 SPDT toggle switch
9 Volt battery & clip
and miscellaneous stuff you should have laying around the house.
The 2 wires that lead from the main part of the circuit
should be connected to the center poles on the toggle
switch. Put the 2 wires to the pot on one side and the 2
wires going to the push-buttons to the other side. That way
you can switch between tone sweep and the favorite tones you
like (the push-button side).
To keep tones that you want to use frequently like 1850 Hz
then all you have to do is put in a variable resistor and
adjust it to where you have the correct tone, then just put
a push-button switch on the line. You can link them
together in a chain, etc. There are many other good
modifications to make to the box so have fun and be smart.
