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- Maharaja's Hi-Times 10 MEG BBS C/F
- $$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$
- $$ $$
- $$ ***************** $$
- $$ * How to make a * $$
- $$ ***************** $$
- $$ $$
- $$ <> Pearl Box <> $$
- $$ $$
- $$ Written and created by: Dr. D-Code $$
- $$ $$
- $$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$
-
- 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 pro-
- duce 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 The 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. There is also a Hi-Res picture you can get that shows the schematic in
- great detail.
-
- (Schematic for The Pearl Box)
-
- +-------------+------------+---------+
- ! ! \ +--S1----
- C1 C2 \ SPKR
- ! ! + +--------
- + + ----+T1 +
- !\ +---------------+------+
- ! b c-------!
- ! Q1 !
- ! e-----S2---+ !
- ! ! !
- ! B1 !
- ! ! !
- ! +-------+
- !R1 R2 R3 R4!
- /\/\ /\/\ /\/\ /\/\
- +--+ +--+ +--+
-
- Now that you are probably thoroughly confused, let me explain a few minor de-
- tails. 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 push button switch and VWALA! You have the tone. If you don't
- have a tone re-check all connections and schematic. If you still don't have
- a tone call Brainstorm BBS:612-345-2815, The Bay:415-775-2384 or Pirate's
- Harbor:617-720-3600 and leave me e-mail stating what the scene is.
-
-
- ______________________________________________________________________________
-
- This has been a High Mountain Hackers presentation - 1985
- ______________________________________________________________________________
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