Pearl Box Plans       1818 t tuuuu S S    2626
 
by the Jolly Roger

The Pearl Box:Definition - This is a
box that may substitute for many
boxes
which produce tones in hertz. The Pearl Box when operated correctly can
produce tones from 1-9999hz. As you can see, 2600, 1633, 1336 and other
crucial tones are obviously in its sound spectrum.

Materials you will need in order to
build The Pearl Box:
====u1u152521212u u  u uu2u241416565
 
  u ututututuOTOT
C1, C2:.5mf or .5uf ceramic disk
2626
 
capacitors
Q1.....NPN transistor (2N2222 works
2626
 
best)
S1.....Normally open momentary SPST
2626
 
switch
S2.....SPST toggle
switch
B1.....Standard 9-Volt battery
R1.....Single
turn, 50k potentiometer
R2..... 
"26
 
"26
 100k potentiometer
R3..... 
"26
 
"26
 500k potentiometer
R4..... 
"26
 
"26
 1meg potentiometer
SPKR...Standard 8-ohm speaker
T1.....Mini transformer (8-ohm works
2626
 
best)
Misc...Wire, solder, soldering iron, PC
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board or perfboard,
box to
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contain the completed unit,
2626
 
battery clip

Instructions for building Pearl Box:
====u1u152521212u u  u uu2u241416565
 
Since the instruction are EXTREMELY difficult to
explain in words, you will
be given a
schematic instead. It will be quite difficult to
follow but try
it any
way. 

(Schematic for The Pearl Box)
+---+-------elele+-------el+
2626!S    2626
 
!S    2626
\
2626C1S    2626
 
C2S    2626
\
2626!S    2626
 
6!S    2626
 
+
2626+S    2626
 
6+S    26---el+T1
2626!\    2626
 
6+-------elele+-+
2626!S b 
c--elele!S    2626
 
6
+
2626!S  Q1S    2626
 
626
 
6!S  +-S1-
2626!S    eeleleS2ele+626
 
6!S   SPKR
2626!S    2626
 
6626!S    26! 
6+----
2626!S    2626
 
662B1S    26!
2626!S    2626
 
6626!S    26!
2626!S    2626
 
6626+-------+
2626!R1S  R2S  R3S  R4!
2626/\/\6/\/\6/\/\6/\/\
2626
 +--+ +--+ +--+
Now that you are probably thoroughly confused,
let me
explain a
few
minor details. The potentiometer area is rigged so that the left pole
is
connected to the center pole
of the potentiometer next to
it.
The middle
terminal of T1 is connected to the piece
of wire that runs down
to the end of the battery.

Correct operation of The Pearl Box:
====u1u152521212u u  u uu2u24141656
You may want to
get some dry-transfer decals at Radio Shack to
make this
job a
lot easier. Also, some knobs for the tops
of the potentiometers
may be useful too. Use the decals to
calibrate the knobs. R1 is the knob
for the ones place, R2Sis for the tens place, R3Sif for the hundreds
place and R4Sis for the thousands place. S1Sis for producing the all the
tones and S2Sis for power. 
Step 1: Turn on the power and adjust the knobs for the desired tone.
2626
 
(Example: For 2600 hz-
2626
 
  R1=0:R2=0:R3=6:R4=2)
Step 2: Hit the pushbutton
switch and VIOLA!SYou have the tone. If 
you don't have a tone recheck all connections and schematic. 

      1818 t tuuuu S S    2626
 
-------elelelel O O Jolly Roger