223 lines
8.7 KiB
Plaintext
223 lines
8.7 KiB
Plaintext
|
||
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!
|
||
|