75 lines
2.9 KiB
Plaintext
75 lines
2.9 KiB
Plaintext
Pearl Box Plans by the Jolly Roger
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The Pearl Box:Definition - This is a box that may substitute for many boxes
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which produce tones in hertz. The Pearl Box when operated correctly can
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produce tones from 1-9999hz. As you can see, 2600, 1633, 1336 and other
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crucial tones are obviously in its sound spectrum.
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Materials you will need in order to build The Pearl Box:
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========================================================
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C1, C2:.5mf or .5uf ceramic disk
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capacitors
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Q1.....NPN transistor (2N2222 works
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best)
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S1.....Normally open momentary SPST
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switch
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S2.....SPST toggle switch
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B1.....Standard 9-Volt battery
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R1.....Single turn, 50k potentiometer
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R2..... " " 100k potentiometer
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R3..... " " 500k potentiometer
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R4..... " " 1meg potentiometer
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SPKR...Standard 8-ohm speaker
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T1.....Mini transformer (8-ohm works
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best)
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Misc...Wire, solder, soldering iron, PC
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board or perfboard, box to
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contain the completed unit,
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battery clip
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Instructions for building Pearl Box:
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======================================
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Since the instruction are EXTREMELY difficult to explain in words, you will
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be given a schematic instead. It will be quite difficult to follow but try
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it any way.
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(Schematic for The Pearl Box)
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+---+------------+---------+
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! ! \
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C1 C2 \
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! ! +
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+ + -----+T1
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!\ +------------+-+
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! b c-------! +
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! Q1 ! +-S1-
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! e-----S2---+ ! SPKR
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! ! ! +----
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! B1 !
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! ! !
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! +-------+
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!R1 R2 R3 R4!
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/\/\ /\/\ /\/\ /\/\
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+--+ +--+ +--+
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Now that you are probably thoroughly confused, let me explain a few
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minor details. The potentiometer area is rigged so that the left pole is
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connected to the center pole of the potentiometer next to it.
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The middle terminal of T1 is connected to the piece of wire that runs down
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to the end of the battery.
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Correct operation of The Pearl Box:
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===================================
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You may want to get some dry-transfer decals at Radio Shack to make this
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job a lot easier. Also, some knobs for the tops of the potentiometers
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may be useful too. Use the decals to calibrate the knobs. R1 is the knob
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for the ones place, R2 is for the tens place, R3 if for the hundreds
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place and R4 is for the thousands place. S1 is for producing the all the
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tones and S2 is for power.
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Step 1: Turn on the power and adjust the knobs for the desired tone.
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(Example: For 2600 hz-
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R1=0:R2=0:R3=6:R4=2)
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Step 2: Hit the pushbutton switch and VIOLA! You have the tone. If
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you don't have a tone recheck all connections and schematic.
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--------------------Jolly Roger
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