098 Pearl Box Plans

Published in

· 4 years ago

  

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

Instructions for building Pearl Box: 
====================================== 
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) 
+---+------------+---------+ 
    !            !          \ 
    C1            C2          \ 
    !             !            + 
    +             +       -----+T1 
    !\            +------------+-+ 
    !  b  c-------!              + 
    !   Q1                   !   +-S1- 
    !     e-----S2---+       !    SPKR 
    !                !       !   +---- 
    !               B1       ! 
    !                !       ! 
    !                +-------+ 
    !R1   R2   R3   R4! 
    /\/\ /\/\ /\/\ /\/\ 
      +--+ +--+ +--+ 
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: 
=================================== 
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, R2 is for the tens place, R3 if for the hundreds 
place and R4 is for the thousands place. S1 is for producing the all the 
tones and S2 is for power.  
Step 1: Turn on the power and adjust the knobs for the desired tone. 
       (Example: For 2600 hz- 
         R1=0:R2=0:R3=6:R4=2) 
Step 2: Hit the pushbutton switch and VIOLA! You have the tone. If  
you don't have a tone recheck all connections and schematic.  

                                 --------------------Jolly Roger