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⬅️ Previous capture (2022-06-12)

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 BBBB  L    U    U EEEEE     BBBB    OOOO  X    X
 B   B L    U    U E         B   B  O    O  X  X
 B  B  L    U    U EEE       B  B   O    O    X
 B   B L    U    U E         B   B  O    O   X X
 BBBB  LLLL  UUUU  EEEEE     BBBB    OOOO   X   X


THIS BULLETIN WILL DEAL ONLY WITH THE BASIC CONTRUCTION,
TROUBLESHOOTING AND ADJUSTMENT OF THE BLUE BOX. IF YOU WOULD
LIKE TO KNOW THE SPECIFIC JOB OF ANY PART IN THE CIRCUIT
JUST WRITE ME A MSG AND I WILL BE GLAD TO ANSWER IT.


 WE ALL KNOW THAT THE TOUCH TONES FREQUENCIES ARE COMPOSED
 OF TWO TONES (TWO DIFFERENT FREQS.) SO THAT IS THE REASON
 WHY WE HAVE 2 VCO'S ( VOLTAGE CONTROLLED OSCILATORS). WE
 WILL CALL THESE VCO#1 AND VCO#2. IF YOU HAVE NOTICED VCO#1
 ANS VCO#2 ARE EXACTLY THE SAME TYPE OF CIRCUITS.  THAT IS
 WHY ONLY ONE WAS DRAWN.  BUT REMEMBER THAT WHATEVER GOES
 FOR VCO#1 ALSO GOES FOR VCO#2.  BOTH VCO'S ARE COMPOSED OF
 A HANDFULL OF PARTS.  ONE CHIP TWO CAPACITORS 2 RESISTORS
 AND FIVE POTENTIOMETERS.  ALL OF THIS WILL GIVE YOU (WHEN
 PROPERLY CALIBRATED) ONE OF THE FREQS. NECESSARY (THE OTHER
 ONE WILL COME FROM VCO#2) FOR THE OPERATION OF THE BB. BOTH
 OF THESE FREQS. WILL BE MIXED IN THE SPEAKER THUS FORMING
 THE REQUIRED TONE.

 THIS IS ONE OF THE MOST SOPHISTICATED DESIGNS I HAVE EVER
 MADE.  WHY?  BECAUSE OTHER DESIGNS WILL DRAIN THE BATTERY
 AFTER 10 CALLS!  THIS DESIGN WILL MAKE THEM LAST 10
 MONTHS!!!!!!. BUT NEVER THE LESS DON'T FORGET TO PUT IN A
 SWITCH FOR ON AND OFF.  OK LET'S BUILD THE TWO VCO'S AND
 CALIBRATE THE UNIT BEFORE WE GET TO THE KEYBOARD
 CONTRUCTION.


                       VCO CONTRUCTION
                       === ===========
  TOOLS REQUIRED

 1 OCILLISCOPE    (RECOMENDED BUT NOT REQUIRED)
 1 FREQ. COUNTER   (REQUIRED)
 1 VOLT METER       "  "  "
  ELECTRONICS TOOLS  (PLIERS,DRILL, SCREWDRIVERS, ETC)


      PARTS

 R1    1.5K RESISTOR  5%
 R2    1K   RESISTOR  5%
 C1    .1UF ELECTROLYTIC CAPACITOR   16VDC
 C2    .01UF ELECTROLYTIC CAPACITOR (MYLAR) 16VDC
 IC1   2207  VCO CHIP  BY EXAR ELECTRINICS
  REMEMBER THE ABOVE IT IS ONLY FOR VCO#1 BUT THE SAME GOES FOR VCO#2.

 R3-R4  150 OHM RESISTORS  5%
 C3-C4   .1 UF  ELECTROLITIC CAPACITOR 10VDC
 P1-P10 200K TRIMMER POT - 20 TURNS
 DIODES USED IN THE KEYBOARD ARE 1N914 TYPE (40 OF THEM)
 AND 13 SWITCHES FOR THE KEYBOARD SPST. MOMENTARY.

 SPKR= YOU CAN USE A TELEPHONE SPEAKER FOR THIS(IT WORKS BEST)
        BUT REMEMBER TO TAKE OUT THE DIODE THAT IS CONNECTED ACCROSS IT.

                 IMPORTANT NOTES

   1. DO NOT USE ANYTHING ELSE THAN A MYLAR CAPACITOR FOR C2
   2. PINS 10,9,8 SHOULD BE TIED TOGETHER AND BE LEFT  FLOATING.
   3. ALL RESISTOR SHOULD BE 5%! NOTHING ELSE
   4. A TELEPHONE SPEAKER GIVES THE BEST RESULTS



                TROUBLE SHOOTING

BY NOW YOU SHOULD HAVE CONSTRUCTED THE TWO VCO'S ON A BREAD
BOARD OR ANYTHING THAT PLEASES YOU.

 CHECK FOR COLD SOLDER JOINTS, BROKEN WIRES, POLARITY OF THE
 BATTERY, ETC.........

 BEFORE WE APPLY POWER TO THE VCO'S WE HAVE TO ADJUST THE
 POTS FOR THEIR HALF WAY TRAVEL POINT.  THIS IS DONE BY
 TURNING THEM 21 TURNS TO THE RIGHT AND THEN 10 TURNS TO THE
 LEFT. DO THE SAME FOR ALL TEN OF THEM.

 NOW APPLY POWER TO THE UNIT CHECK TO SEE THAT YOU HAVE
 POWER IN THE CHIPS BY PUTTING THE POSITIVE LEAD OF YOUR
 VOLT METER ON PIN 7 AND THE NEGATIVE LEAD ON PIN 12. IF YOU
 DON'T HAVE ANYTHING THERE TURN OFF THE UNIT ANT RECHECK THE
 WIRING.

 WHEN YOU GET THE RIGHT VOLTAGES ON THE CHIPS, CONNECT A
 DIODE TO A PIECE OF WIRE (LOOK AT FIG. 2 FOR THE
 ORIENTATION OF THE DIODE) FROM GROUND TO ANY POT AT POINT T
 (LOOK CAREFULLY AT THE SCHEMATIC FOR POINT T IT IS LABELED
 T1-T10 FOR ALL POTS) YOU SHOLD BE ABLE TO HEAR A TONE, IF
 NOT DISSCONNECT THE LEAD AND PLACE THE SPEAKER CLOSE TO
 YOUR EAR AND IF YOU HEAR A CHIRP LIKE SOUND, THIS MEANS
 THAT THE TWO VCO'S ARE WORKING IF YOU DON'T, IT MEANS THAT
 EITHER ONE OR BOTH OF THE VCO'S IS DEAD.  SO IN THIS CASE
 IT IS ALLWAYS GOOD TO HAVE AN OCILLOSCOPE ON HAND.

 DISCONNECT THE SPEAKER FROM THE CIRCUIT AND HOOKUP THE
 OCILLISCOPE TO ONE OF THE LEADS OF THE SPEAKER AND THE
 GROUND FROM THE SCOPE TO THE GROUND OF THE BATTERY.
 CONNECT AGAIN THE GROUND LEAD WITH THE DIODE CONNECTED TO
 IT FROM GROUND TO ANY POT ON THE VCO THAT YOU ARE CHECKING
 AND YOU SHOULD SEE A TRIANGLE WAVE IF NOT TURN THE POT IN
 WICH YOU ARE APPLYING THE GROUND TO UNTIL YOU SEE IT. WHEN
 YOU DO SEE IT DO THE THE SAME FOR THE OTHER VCO TO MAKE
 SURE IT IS WORKING. (AMPLITUDE IS ABOUT 2VAC)

 WHEN YOU GET THE TWO VCO'S WORKING YOU ARE SET FOR THE
 ADJUSTMENT OF THE INDIVIDUALS POTS...

                       ADJUSTMENT


 DISCONNECT THE SPEAKER FROM THE CIRCUIT AND CONNECT A FREQ.
 COUNTER (THE POSITIVE LEAD OF THE COUNTER TO ONE OF THE
 SPEAKERS LEADS THAT BELONGS TO VCO#1 OR CONNECT IT TO PIN
 14).

 CONNECT THE NEGATIVE LEAD TO THE BATTERY NEGATIVE AND
 CONNECT THE JUMPER LEAD WITH THE DIODE FROM GROUND TO POT
 NUMBER 1 T1 .( THE FIRST POT NUMBER 1 POINT T1) IF YOU GOT
 IT WORKING YOU SHOULD HEAR A TONE AND GET A READING ON
 THECOUNTER.  ADJUST THE POT FOR A FREQ. OF 1700HZ AND
 CONTINUE DOING THE SAME FOR POTS 2-5 EXCEPT THAT THEY GET
 DIFFERENTS FREQS.


                    P1= 1700HZ
                    P2= 1300HZ
                    P3= 1100HZ
                    P4=  900HZ
                    P5= 1500HZ

 NOW DISCONNECT THE FREQ. COUNTER FROM THE SPEAKER LEAD OF 
 VCO#1 OR FROM PIN 14 (WHICH EVER YOU HAD IT ATTACHED TO AT 
 THE BEGINNING) AND CONNECT IT TO THE SPAKER LEAD OF VCO#2 
 OR TO PIN 14 OF VCO#2 AND PERFORM THE SAME ADJUSTMENTS TO 
 P6-10. 

                    P6= 1100HZ
                    P7=  700HZ
                    P8=  900HZ
                    P9=  2600HZ   MAGIC NUMBER!!!!!
                    P10= 1500HZ

  WHEN YOU FINISH DOING ALL OF THE POT GO BACK AND RECHECK THEM AGAIN.


                 KEYBOARD
 IF YOU LOOK AT FIG-2 YOU WILL SEE THAT THE KEYS ARE SIMPLE 
 SWITCHES CONNECTED TO GROUND AND TWO DIODES ON THE OTHER 
 END. THESE DIODES ARE USED TO SIMPLIFY THE CONSTRUCTION OF 
 THE KEYBOARD BECAUSE OTHERWISE THE DISTRIBUTION OF THE 
 GROUND SIGNAL FOR BOTH VCO'S WOULD HAVE BEEN DONE 
 MECHANICALLY.  ONE DIODE WILL GO TO VCO#1 AND THE OTHER 
 WILL GO TO VCO#2. FIG-3 SHOWS THE ARRANGEMENT OF THE KEYS 
 ON THE KEYBOARD. 


 BELOW IS A TABLE THAT WILL HELP YOU CONNECT THE KEYS TO 
 REQUIRED VCO'S POTS. 

                TO               TO    
         FREQ OUT            FREQ OUT
     KEY     POT ON VCO1     POT ON VCO
2        PIN 14 VCO1       PIN 14 VCO
      C          1                6    
          1700              1100
      0          2                10   
          1300              1500
      E          1                10   
          1700              1500
      1          4                7    
           900               700
      2          3                7    
          1100               700
      3          3                8    
          1100               900
      4          2                7    
          1300               700
      5          2                8    
          1300               900
      6          2                6    
          1300              1100
      7          5                7    
          1500               700
      8          5                8    
          1500               900
      9          5                6    
          1500              1100
      X          -                9    
          ----              2600
 

  REMEMBER THAT FIG-2 IT IS THE SAME FOR EACH KEY EXCEPT THE 
"X" WHICH ONLY TAKES ONE DIODE. 



  AS A FINAL WORD YOU CAN BUILD THIS IN ANY TYPE OF 
                                    ENCLOSURE AND SHOULD 
                                    NEVER BE USED TO MAKE 
                                    FREE CALLS USING THE 
                                    TELEPHONE LINES. I HOPE 
                                    THIS BULLETIN WILL CLEAR 
                                    ANY QUESTION YOU MAY HAD 
                                    ON THE BLUE BOXES. IF 
                                    YOU HAVE ANY QUESTION 
                                    PLEASE LEAVE ME A MSG. 
                                    AND I WILL BE VERY GLAD 
                                    TO ANSWER IT. TXS 
                               MR. AMERICA

  PS. I WOULD LIKE TO THANK MY KEYBOARD, MY FINGERS, AND ME 
  FOR HELPING ME WRITING THIS PHILE!