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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!