=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-= 5 $$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$ $ Blue Box Plans.. $ $ $ $$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$ $$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$ $ THIS FILE WILL EXPLAIN THE $ $ CONSTRUCTION, TROUBLESHOOTING, AND $ $ ADJUSTMENT OF A BLUE BOX. $ $ $ $ $ $ $ $ WE ALL KNOW THAT THE TOUCH TONE $ $ FREQUENCIES ARE COMPOSED OF 2 TONES $ $ (2 DIFFERENT FREQS.) SO THAT IS THE $ $ REASON WHY WE HAVE 2 VCO'S (VOLTAGE $ $ CONTROLLED OSCILATORS). WE'LL CALL $ $ THEM VCO#1 AND VCO#2. IF YOU HAVE $ $ NOTICED VCO#1 AND VCO#2 ARE EXACTLY $ $ THE SAME TYPE OF CIRCUITS. THAT IS $ $ WHY ONLY 1 WAS DRAWN. BUT REMEMBER $ $ THAT WHATEVER GOES FOR VCO#1 ALSO $ $ GOES FOR VCO#2. BOTH VCO'S ARE $ $ COMPOSED OF A HANDFULL OF PART. ONE $ $ CHIP, TWO CAPACITORS, 2 RESISTORS $ $ AND FIVE POTENTIOMETERS. ALL OF $ $ THIS WILL GIVE YOU (WN PROPERLY $ $ CALIBRATED) ONE OF THE FREQENCIES $ $ NECESSARY (THE OTHER ONE WILL COME $ $ FROM VCO#2) FOR THE OPERATION OF $ $ THE BLUE BOX. BOTH OF THESE FREQS. $ $ WILL BE MIXED IN THE SPEAKER TO $ $ FORM 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 CONSTRUCTION. $ $ $ < > -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=- ! VCO CONSTRUCTION ! === ============ ! ! TOOLS REQUIRED ! ----- -------- ! ! 1 OCILLISCOPE(OPTIONAL BUT NOT REQ) ! 1 FREQ. COUNTER (REQUIRED) ! 1 VOLT METER " " " ! ELECTRONICS TOOLS (PLIERS,DRLL, ! SCREWDRIVERS, ETC.) ! ! -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=- < > ....................................... . . . ------------- . . ! $-PARTS-$ ! . . ------------- . . . . R1 1.5K RESISTOR 5% . . R2 1K RESISTOR 5% . . C1 .1UF ELECTROLYTIC CAPACITOR 16VDC. . C2 .01UF " " (MYLQR)16VDC. .IC1 2207 VCO CHIP BY EXAR ELECTRONICS. . REMEMBER THE ABOVE ONLY SAYS . . VCO#1 BUT THE SAME IS 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) & . . 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 OTHER * * THAN A MYLAR CAPACITOR FOR C2. * * 2. PINS 10,9,8 SHOULD BE TIED * * TOGETHER AND BE LEFT FLOATING. * * 3. ALL RESISTORS 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 THATY 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 DO % % NOT HAVE ANYTHING THERE TURN OFF % % THE UNIT AND 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 SHOULD BE ABLE TO % % HEAR A TONE, IF NOT DISCONNECT THE % % LEAD AND PLACE THE SPEAKER CLOSE TO % % YOUR EAR AND IF YOU HEAR A % % CHIRP-LIKE SOUND, THIS MEA^S THAT % % THE TWO VCO'S ARE WORKING IF YOU % % DON'T, IT MEANS THAT EITHER ONE OR % % BOTH OF THE VCO'S ARE DEAD. SO IN % % THIS CASE IT IS ALWAYS GOOD TO HAVE % % AN OCILLOSCOPE ON HAND. % % DISCONNECT THE SPEAKER FROM THE % % CIRCUIT AND HOOK THE OCILLISCOPE TO % % 1 OF THE LEADS OF THE SPEAKER & 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 WHICH 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 : : THE COUNTER. ADJUST THE POT FOR A : : FREQ. OF 1700HZ AND CONTINUE DOING : : THE SAME FOR POTS 2-5 EXCEPT THAT : : THEY GET DIFFERENTS FREQS. WHICH ARE: : : : $ $ : : $ 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 SPEAKER LEAD OF : : VCO#2 OR TO PIN 14 OF VCO#2 AND : : MAKE THE SAME ADJUSTMENTS TO P6-10. : : : : $ $ : : $ P6= 1100HZ $ : : $ P7= 700HZ $ : : $ P8= 900HZ $ : : $ P9= 2600HZ $ : : $ P10= 1500HZ $ : : $ $ : : : : WHEN YOU FINISH DOING ALL OF THE : : POTS GO BACK AND RE-CHECK THEM. : : : ::::::::::::::::::::::::::::::::::::::: < > < > < ------------ > < ! KEYBOARD ! > < ------------ > < > < IF YOU LOOK AT FIG-2 YOU WILL SEE > < THAT THE KEYS ARE SIMPLE SWITCHES. > < CONNECTED TO A 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. > < THE 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 THE > < REQUIRED VCO'S POTS. > < > <-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-> < > < (-FIG 2-) > < > <-----!-----!--------!--------!-------> < ! ! ! ! > < TO ! TO ! FREQ ! FREQ ! KEY > < POT ! POT ! OUT: ! OUT: ! > < ON ! ON ! ! ! > < VCO1! VCO2! ! ! > <-----!-----!--------!--------!-------> < 1 ! 06 ! 1700HZ ! 1100HZ ! C > < 2 ! 10 ! 1300HZ ! 1500HZ ! 0 > < 1 ! 10 ! 1700HZ ! 1100HZ ! E > < 4 ! 07 ! 0900HZ ! 0700HZ ! 1 > < 3 ! 07 ! 1100HZ ! 0700HZ ! 2 > < 3 ! 08 ! 1100HZ ! 0900HZ ! 3 > < 2 ! 07 ! 1300HZ ! 0700HZ ! 4 > < 2 ! 08 ! 1300HZ ! 0900HZ ! 5 > < 2 ! 06 ! 1300HZ ! 1100HZ ! 6 > < 5 ! 07 ! 1500HZ ! 0700HZ ! 7 > < 5 ! 08 ! 1500HZ ! 0900HZ ! 8 > < 5 ! 06 ! 1500HZ ! 1100HZ ! 9 > < - ! 09 ! ------ ! 2600HZ ! X > < ! ! ! ! > <-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-> < > < REMEMBER THAT IN FIG-2 IT'S THE > < SAME FOR EACH KEY EXCEPT THE "X" > < KEY, 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, OR + + ANYTHING ELSE ILLEGAL. + + + +-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-+ [5] Tfiles: (1-23,?,Q) : G-file from.. MATRIX [908-905-6691] -*- =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=