223 lines
8.7 KiB
Plaintext
223 lines
8.7 KiB
Plaintext
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BBBB L U U EEEEE BBBB OOOO X X
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B B L U U E B B O O X X
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B B L U U EEE B B O O X
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B B L U U E B B O O X X
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BBBB LLLL UUUU EEEEE BBBB OOOO X X
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THIS BULLETIN WILL DEAL ONLY WITH THE BASIC CONTRUCTION,
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TROUBLESHOOTING AND ADJUSTMENT OF THE BLUE BOX. IF YOU WOULD
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LIKE TO KNOW THE SPECIFIC JOB OF ANY PART IN THE CIRCUIT
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JUST WRITE ME A MSG AND I WILL BE GLAD TO ANSWER IT.
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WE ALL KNOW THAT THE TOUCH TONES FREQUENCIES ARE COMPOSED
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OF TWO TONES (TWO DIFFERENT FREQS.) SO THAT IS THE REASON
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WHY WE HAVE 2 VCO'S ( VOLTAGE CONTROLLED OSCILATORS). WE
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WILL CALL THESE VCO#1 AND VCO#2. IF YOU HAVE NOTICED VCO#1
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ANS VCO#2 ARE EXACTLY THE SAME TYPE OF CIRCUITS. THAT IS
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WHY ONLY ONE WAS DRAWN. BUT REMEMBER THAT WHATEVER GOES
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FOR VCO#1 ALSO GOES FOR VCO#2. BOTH VCO'S ARE COMPOSED OF
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A HANDFULL OF PARTS. ONE CHIP TWO CAPACITORS 2 RESISTORS
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AND FIVE POTENTIOMETERS. ALL OF THIS WILL GIVE YOU (WHEN
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PROPERLY CALIBRATED) ONE OF THE FREQS. NECESSARY (THE OTHER
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ONE WILL COME FROM VCO#2) FOR THE OPERATION OF THE BB. BOTH
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OF THESE FREQS. WILL BE MIXED IN THE SPEAKER THUS FORMING
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THE REQUIRED TONE.
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THIS IS ONE OF THE MOST SOPHISTICATED DESIGNS I HAVE EVER
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MADE. WHY? BECAUSE OTHER DESIGNS WILL DRAIN THE BATTERY
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AFTER 10 CALLS! THIS DESIGN WILL MAKE THEM LAST 10
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MONTHS!!!!!!. BUT NEVER THE LESS DON'T FORGET TO PUT IN A
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SWITCH FOR ON AND OFF. OK LET'S BUILD THE TWO VCO'S AND
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CALIBRATE THE UNIT BEFORE WE GET TO THE KEYBOARD
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CONTRUCTION.
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VCO CONTRUCTION
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=== ===========
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TOOLS REQUIRED
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1 OCILLISCOPE (RECOMENDED BUT NOT REQUIRED)
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1 FREQ. COUNTER (REQUIRED)
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1 VOLT METER " " "
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ELECTRONICS TOOLS (PLIERS,DRILL, SCREWDRIVERS, ETC)
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PARTS
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R1 1.5K RESISTOR 5%
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R2 1K RESISTOR 5%
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C1 .1UF ELECTROLYTIC CAPACITOR 16VDC
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C2 .01UF ELECTROLYTIC CAPACITOR (MYLAR) 16VDC
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IC1 2207 VCO CHIP BY EXAR ELECTRINICS
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REMEMBER THE ABOVE IT IS ONLY FOR VCO#1 BUT THE SAME GOES FOR VCO#2.
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R3-R4 150 OHM RESISTORS 5%
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C3-C4 .1 UF ELECTROLITIC CAPACITOR 10VDC
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P1-P10 200K TRIMMER POT - 20 TURNS
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DIODES USED IN THE KEYBOARD ARE 1N914 TYPE (40 OF THEM)
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AND 13 SWITCHES FOR THE KEYBOARD SPST. MOMENTARY.
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SPKR= YOU CAN USE A TELEPHONE SPEAKER FOR THIS(IT WORKS BEST)
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BUT REMEMBER TO TAKE OUT THE DIODE THAT IS CONNECTED ACCROSS IT.
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***********************************************************
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IMPORTANT NOTES
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1. DO NOT USE ANYTHING ELSE THAN A MYLAR CAPACITOR FOR C2
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2. PINS 10,9,8 SHOULD BE TIED TOGETHER AND BE LEFT FLOATING.
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3. ALL RESISTOR SHOULD BE 5%! NOTHING ELSE
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4. A TELEPHONE SPEAKER GIVES THE BEST RESULTS
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***********************************************************
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TROUBLE SHOOTING
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BY NOW YOU SHOULD HAVE CONSTRUCTED THE TWO VCO'S ON A BREAD
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BOARD OR ANYTHING THAT PLEASES YOU.
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CHECK FOR COLD SOLDER JOINTS, BROKEN WIRES, POLARITY OF THE
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BATTERY, ETC.........
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BEFORE WE APPLY POWER TO THE VCO'S WE HAVE TO ADJUST THE
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POTS FOR THEIR HALF WAY TRAVEL POINT. THIS IS DONE BY
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TURNING THEM 21 TURNS TO THE RIGHT AND THEN 10 TURNS TO THE
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LEFT. DO THE SAME FOR ALL TEN OF THEM.
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NOW APPLY POWER TO THE UNIT CHECK TO SEE THAT YOU HAVE
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POWER IN THE CHIPS BY PUTTING THE POSITIVE LEAD OF YOUR
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VOLT METER ON PIN 7 AND THE NEGATIVE LEAD ON PIN 12. IF YOU
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DON'T HAVE ANYTHING THERE TURN OFF THE UNIT ANT RECHECK THE
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WIRING.
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WHEN YOU GET THE RIGHT VOLTAGES ON THE CHIPS, CONNECT A
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DIODE TO A PIECE OF WIRE (LOOK AT FIG. 2 FOR THE
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ORIENTATION OF THE DIODE) FROM GROUND TO ANY POT AT POINT T
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(LOOK CAREFULLY AT THE SCHEMATIC FOR POINT T IT IS LABELED
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T1-T10 FOR ALL POTS) YOU SHOLD BE ABLE TO HEAR A TONE, IF
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NOT DISSCONNECT THE LEAD AND PLACE THE SPEAKER CLOSE TO
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YOUR EAR AND IF YOU HEAR A CHIRP LIKE SOUND, THIS MEANS
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THAT THE TWO VCO'S ARE WORKING IF YOU DON'T, IT MEANS THAT
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EITHER ONE OR BOTH OF THE VCO'S IS DEAD. SO IN THIS CASE
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IT IS ALLWAYS GOOD TO HAVE AN OCILLOSCOPE ON HAND.
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DISCONNECT THE SPEAKER FROM THE CIRCUIT AND HOOKUP THE
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OCILLISCOPE TO ONE OF THE LEADS OF THE SPEAKER AND THE
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GROUND FROM THE SCOPE TO THE GROUND OF THE BATTERY.
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CONNECT AGAIN THE GROUND LEAD WITH THE DIODE CONNECTED TO
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IT FROM GROUND TO ANY POT ON THE VCO THAT YOU ARE CHECKING
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AND YOU SHOULD SEE A TRIANGLE WAVE IF NOT TURN THE POT IN
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WICH YOU ARE APPLYING THE GROUND TO UNTIL YOU SEE IT. WHEN
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YOU DO SEE IT DO THE THE SAME FOR THE OTHER VCO TO MAKE
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SURE IT IS WORKING. (AMPLITUDE IS ABOUT 2VAC)
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WHEN YOU GET THE TWO VCO'S WORKING YOU ARE SET FOR THE
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ADJUSTMENT OF THE INDIVIDUALS POTS...
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ADJUSTMENT
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DISCONNECT THE SPEAKER FROM THE CIRCUIT AND CONNECT A FREQ.
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COUNTER (THE POSITIVE LEAD OF THE COUNTER TO ONE OF THE
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SPEAKERS LEADS THAT BELONGS TO VCO#1 OR CONNECT IT TO PIN
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14).
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CONNECT THE NEGATIVE LEAD TO THE BATTERY NEGATIVE AND
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CONNECT THE JUMPER LEAD WITH THE DIODE FROM GROUND TO POT
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NUMBER 1 T1 .( THE FIRST POT NUMBER 1 POINT T1) IF YOU GOT
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IT WORKING YOU SHOULD HEAR A TONE AND GET A READING ON
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THECOUNTER. ADJUST THE POT FOR A FREQ. OF 1700HZ AND
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CONTINUE DOING THE SAME FOR POTS 2-5 EXCEPT THAT THEY GET
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DIFFERENTS FREQS.
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P1= 1700HZ
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P2= 1300HZ
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P3= 1100HZ
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P4= 900HZ
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P5= 1500HZ
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NOW DISCONNECT THE FREQ. COUNTER FROM THE SPEAKER LEAD OF
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VCO#1 OR FROM PIN 14 (WHICH EVER YOU HAD IT ATTACHED TO AT
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THE BEGINNING) AND CONNECT IT TO THE SPAKER LEAD OF VCO#2
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OR TO PIN 14 OF VCO#2 AND PERFORM THE SAME ADJUSTMENTS TO
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P6-10.
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P6= 1100HZ
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P7= 700HZ
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P8= 900HZ
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P9= 2600HZ MAGIC NUMBER!!!!!
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P10= 1500HZ
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WHEN YOU FINISH DOING ALL OF THE POT GO BACK AND RECHECK THEM AGAIN.
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KEYBOARD
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IF YOU LOOK AT FIG-2 YOU WILL SEE THAT THE KEYS ARE SIMPLE
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SWITCHES CONNECTED TO GROUND AND TWO DIODES ON THE OTHER
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END. THESE DIODES ARE USED TO SIMPLIFY THE CONSTRUCTION OF
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THE KEYBOARD BECAUSE OTHERWISE THE DISTRIBUTION OF THE
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GROUND SIGNAL FOR BOTH VCO'S WOULD HAVE BEEN DONE
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MECHANICALLY. ONE DIODE WILL GO TO VCO#1 AND THE OTHER
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WILL GO TO VCO#2. FIG-3 SHOWS THE ARRANGEMENT OF THE KEYS
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ON THE KEYBOARD.
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BELOW IS A TABLE THAT WILL HELP YOU CONNECT THE KEYS TO
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REQUIRED VCO'S POTS.
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TO TO
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FREQ OUT FREQ OUT
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KEY POT ON VCO1 POT ON VCO
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2 PIN 14 VCO1 PIN 14 VCO
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C 1 6
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1700 1100
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0 2 10
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1300 1500
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E 1 10
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1700 1500
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1 4 7
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900 700
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2 3 7
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1100 700
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3 3 8
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1100 900
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4 2 7
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1300 700
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5 2 8
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1300 900
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6 2 6
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1300 1100
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7 5 7
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1500 700
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8 5 8
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1500 900
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9 5 6
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1500 1100
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X - 9
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---- 2600
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***********************************************************
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REMEMBER THAT FIG-2 IT IS THE SAME FOR EACH KEY EXCEPT THE
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"X" WHICH ONLY TAKES ONE DIODE.
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***********************************************************
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AS A FINAL WORD YOU CAN BUILD THIS IN ANY TYPE OF
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ENCLOSURE AND SHOULD
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NEVER BE USED TO MAKE
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FREE CALLS USING THE
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TELEPHONE LINES. I HOPE
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THIS BULLETIN WILL CLEAR
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ANY QUESTION YOU MAY HAD
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ON THE BLUE BOXES. IF
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YOU HAVE ANY QUESTION
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PLEASE LEAVE ME A MSG.
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AND I WILL BE VERY GLAD
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TO ANSWER IT. TXS
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MR. AMERICA
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PS. I WOULD LIKE TO THANK MY KEYBOARD, MY FINGERS, AND ME
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FOR HELPING ME WRITING THIS PHILE!
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