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***(201)376-4462***
***Call it!!***
$$$$$$$$$$$$$$$$$$$$
$ $
$ BLUE BOX PLANS! $
$ --------------- $
$ $
$ Edited and Uploaded by: $
$ $
$ $
$$$$$$-=>Lex Luthor<=-$$$$$$
$ $
$ Written by: $
$ $
$ Mr. America from Osuny BBS $
$ $
$$$$$$$$$$$$$$$$$$$$
$ Gotten From: The Morgue $
$ (201)376-4462 $
$ This file will explain the $
$ construction, troubleshooting, and $
$ adjustment of a Blue Box. $
$ $
$ $
$$$$$$$$$$$$$$$$$$$$
$ $
$ We all know that the touch tone $
$ frequencies are composed of 2 tones $
$ (2 different freqs.) so that is the $
$ reason why we have 2 VCO's (Voltage $
$ Controlled Oscilators). We'll call $
$ them VCO#1 and VCO#2. If you have $
$ noticed VCO#1 and VCO#2 are exactly $
$ the same type of circuits. That is $
$ why only 1 was drawn. But remember $
$ that whatever goes for VCO#1 also $
$ goes for VCO#2. Both VCO'S are $
$ composed of a handfull of part. One $
$ chip, two capacitors, 2 resistors $
$ and five potentiometers. All of $
$ this will give you (when properly $
$ calibrated) one of the freqencies $
$ necessary (the other one will come $
$ from VCO#2) for the operation of $
$ the Blue Box. Both of these freqs. $
$ will be mixed in the speaker to $
$ form the required tone. $
$ $
$$$$$$$$$$$$$$$$$$$$
$ $
$ This is one of the most $
$ sophisticated designs I have ever $
$ made. Why?. Because other designs $
$ will drain the battery after 10 $
$ calls. This design will make them $
$ last 10 months!!!!!!. But never the $
$ less, don't forget to put in a $
$ switch for on and off. Ok let's $
$ build the two VCO'S and calibrate $
$ the unit before we get to the $
$ keyboard construction. $
$ $
$$$$$$$$$$$$$$$$$$$$
< >
-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
! !
! 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 means 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. +
+ +
+-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-+
+ +
+ If anyone needs other info on the +
+ use of blue boxes, such as: how to +
+ get unpublished phone #'s, routing +
+ codes etc., leave me mail. +
+
+ +
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
later,
$$$$$$-=>Lex Luthor<=-$$$$$$
Remote Sysop
of
Plover-Net