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Text File  |  1999-01-28  |  9KB  |  397 lines
  1.  
  2.  
  3. <><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><>
  4.  
  5. <>                       The BAD BOY'S (tm) and ABuSe                     <>
  6.  
  7. <>               Presents 'How to Build a Telephone Scramber '            <>
  8.  
  9. <>                           By  Bloodwing ->BB<-                         <>
  10.  
  11. <>                        Thx to Casual and Crusader                      <>
  12.  
  13. <>                                                                        <>
  14.  
  15. <>                              ____  .     ______                        <>
  16.  
  17. <>                          /\ /    \/| .  / __/__\                       <>
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  19. <>                         /  \   \ / | |\ \ \| |_                        <>
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  21. <>                        / /  \    \ | | \_\ \  _|                       <>
  22.  
  23. <>                       /  _   \ /  \|_| /    \|____                     <>
  24.  
  25. <>                      /__/ |___\___/___/_____/_____\                    <>
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  27. <>                                                                        <>
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  29. <>                                                                        <>
  30.  
  31. <><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><>
  32.  
  33.  
  34.  
  35.  NO LAME CAPTURES * DOWNLOAD IT * CALL TRˇPICAL ISLAN≠ -> 49-421-467-SˇˇN 
  36.  
  37. .............................................................................
  38.  
  39. ßßßßßßßßßßßßßßßßßßßßßßßßßßßßßßßßßßßßßßßßßßßßßßßßßßßßßßßßßßßßßßßßßßßßßßßßßßßßß
  40.  
  41.                               Telephone Scrambler
  42.  
  43.                               -------------------
  44.  
  45.  
  46.  
  47.       Protect your confidential telephone calls against intrusion with
  48.  
  49.       this easy-to-build scrambler.
  50.  
  51.  
  52.  
  53.  
  54.  
  55. Scrambling is the most effective method for eliminating unwanted evesdropping
  56.  
  57. on your confidential calls.  It should be considered if you have reason to
  58.  
  59. believe that unauthorized persons are or could be listening in.  A system
  60.  
  61. consisting of two compatible telephone scramblers will permit normal
  62.  
  63. conversation between you and your intended listener, while making all speech
  64.  
  65. unintelligible to anyone listening in at either end of the line.  Only persons
  66.  
  67. with a compatible unscrambler will be able to understand what is being said.
  68.  
  69.  
  70.  
  71. (Fig.1)
  72.  
  73. Complete telehpone security is obtained with a TVS250 at both ends of the
  74.  
  75. phone line forming a duplex scrambler/descrambler system.
  76.  
  77. [Headset]-[TVS250]-[Phone]-[Phoneline]-[Phone]-[TSV250]-[Headset]
  78.  
  79.  
  80.  
  81. :Circuit Design:
  82.  
  83. The COM9046 voice scrambler/descrambler IC contains a crystal oscillator that
  84.  
  85. that controls system timing.  The onchip oscillator requires an external 3.58-
  86.  
  87. MHz crystal that is commonly used in TV color-burst applications.  The chip
  88.  
  89. also contains switched-capacitor filters, so input speech must be filtered by
  90.  
  91. an anti-aliasing single-pole, low-pass filter before it is applied to the
  92.  
  93. audio input.
  94.  
  95.  
  96.  
  97. :Parts List:
  98.  
  99. All resistors are 1/4-watt, 5%, unless otherwise noted
  100.  
  101. R1 100,000 ohms, PC-mount potentiometer, screwdriver adjust
  102.  
  103. R2 500,000 ohms, PC-mount potentiometer, screwdriver adjust
  104.  
  105. R3,R4 10,000 ohms
  106.  
  107. R5,R6 3900 ohms
  108.  
  109. R8,R9 100,000 ohms
  110.  
  111. R10-R13 1000 ohms
  112.  
  113. R7,R14,R15 51,000 ohms
  114.  
  115. R16-R18 2200 ohms
  116.  
  117. R20 150,000 ohms
  118.  
  119. R21 5100 ohms
  120.  
  121. Capacitors
  122.  
  123. C1,C2 15 pF, ceramic disc
  124.  
  125. C3-C10 0.1 uF, metal film
  126.  
  127. C11,C12 2200 pF, ceramic disc
  128.  
  129. C13-C15 0.001 uF, ceramic disc
  130.  
  131. C16 1uF, 35 volts tantalum
  132.  
  133. C17,C18 10 uF, 16 volts, electrolytic polarized
  134.  
  135. Semiconductors
  136.  
  137. IC1 COM9046 voice-scrambling IC, (Standard Microsystems)
  138.  
  139. IC2 MC34119, audio amplifier driver (Motorola or equiv.)
  140.  
  141. IC3 LM358 dual operation amplifier, single supply
  142.  
  143. IC3 78L05A, 5-volt regulator (Texas Inst. or equiv.)
  144.  
  145. Q1 2N2222A, NPN transistor
  146.  
  147. LED1 green light-emitting diode, T1, 5mm
  148.  
  149. LED2 red light-emitting diode, T1, 5mm
  150.  
  151. Other Components
  152.  
  153. S1 SPST slide, PC-mount, side-actuated switch
  154.  
  155. S2 SPST slide, PC-mount top-actuated switch
  156.  
  157. S3-S6 STS2400 PC, 2P4T slide, PC-mount, top-actuated (Augat/Alcoswitch or
  158.  
  159. equiv) switch
  160.  
  161. J1,J2 telephone jack 4-4, Type 616, PC-mount
  162.  
  163. JU1-JU4 two-post jumper, 3/32 inch-on-center with insulated shorting clips
  164.  
  165. XTL1 crystal 3.579545 MHz, metal case (ITT 4183 or equiv.)
  166.  
  167. B1 9volt transistor battery, alkaline, standard
  168.  
  169. Miscellaneous
  170.  
  171. TVS250 PC board, 5-inch length of telephone cord terminated with standard
  172.  
  173. telephone plugs, 9-volt transistor battery clip-type holder (Keystone No. 79
  174.  
  175. or equiv.) with two 2-56 screws and nuts, 9-volt transistor battery terminal
  176.  
  177. snap with leads, four rubber or plastic PC board feet and solder.
  178.  
  179. :Note:
  180.  
  181. The following parts are available from Securicom, P.O. Box 5227, Chatsworth,
  182.  
  183. CA 91313-5227 (818) 710-0110
  184.  
  185. * COM9046 scrambler/descrambler IC only - $18
  186.  
  187. * Double-sided, silk screened and drilled PC board - $20
  188.  
  189. * A complete kit including PC board, all components, and 5 inch plug-
  190.  
  191.   terminated phone cord - $59.95
  192.  
  193. * Assembled and tested TVS250 with user's manual - $79.95
  194.  
  195.  
  196.  
  197. (Fig.2)
  198.  
  199.               +5V
  200.  
  201.                |                 |--|
  202.  
  203.                o------|    |-----~--o---
  204.  
  205.        2.2k R17~    R4~10k |     R2    |
  206.  
  207.                o---<>-o----|--*+****   |  R11         R5
  208.  
  209.                |   C3 |    |  *IC3a*---o--~---<>---o--~------o--(3)
  210.  
  211.    MIC+-----0^0|      |    o--*-****          C4   |         |
  212.  
  213.             JV4       |    |                       |      C11$
  214.  
  215.                    R3 ~    |                  C5   |  R6     |
  216.  
  217.    MIC------0^0-------|    |---~---<>--#    |-<>-o-|--~---o-----(2)
  218.  
  219.             JV3       #       R21  C8       |    | |   C12$  |
  220.  
  221.                                             |    | |      |--|    (Cont fig.3)
  222.  
  223.                                             |    | |         |
  224.  
  225.    Base audio Signal------------------------|    | |         #
  226.  
  227.                                                R8~ ~R9
  228.  
  229.    Base audio GND------------------------#       | |
  230.  
  231.                                                  --o---------o--(1)
  232.  
  233.                                                              |
  234.  
  235.                                                              |
  236.  
  237.                                                              |
  238.  
  239.                                                              |
  240.  
  241.                                                              |
  242.  
  243.  
  244.  
  245.  
  246.  
  247. (Fig.2)
  248.  
  249.           S1   ******
  250.  
  251.       |---@----* IC4*---o--o--o-->+5v
  252.  
  253.       |        ******   |  |  |
  254.  
  255.       |          |      |  |  ~R13
  256.  
  257.       =          |   C10<> <>C17
  258.  
  259.       |B1        |      |  |  |
  260.  
  261.       |          |      |  |  L LED Green
  262.  
  263.       =----------0------o--o--|
  264.  
  265.                  |
  266.  
  267.                  #
  268.  
  269.  
  270.  
  271.  
  272.  
  273. (Fig.3)
  274.  
  275.  
  276.  
  277.  
  278.  
  279.     C1    XTAL          +5v
  280.  
  281.   --<>--o-&-o---<>-     ^
  282.  
  283.   |     |   |     |     |
  284.  
  285.   #     o-~-o     # |---o
  286.  
  287.         |R19|       |   |
  288.  
  289.        *******      |   L LED2
  290.  
  291.     3--*     *      |   ~ R10
  292.  
  293.        *     *------|---o--S2----------------#
  294.  
  295.     2--* IC1 *      |   |
  296.  
  297.        *     *------|-| <>C6
  298.  
  299.        *     *      | | #       R20       /JV1--
  300.  
  301.        *     *      | |---------~-------Q1      Mic Input to Tele Base
  302.  
  303.        *     *      |                     \JV2--
  304.  
  305.        *     *------|---|
  306.  
  307.        *     *      |   |
  308.  
  309.        *     *      |   |
  310.  
  311.        *     *--o---o   |
  312.  
  313.  1--o--*     *  |   |   |
  314.  
  315.     |  *******--|   |   |
  316.  
  317.     |   |   |       |   |
  318.  
  319.     |   o   o    R18~   ~R14      C14
  320.  
  321.     |   |---|--<>---o   o---------<>---------------|
  322.  
  323.     |   |   |  C18  |   |                   ^+5v   |
  324.  
  325.     |   |   |       |   |   R15             |      |
  326.  
  327.     |   |   o--<>---o   |---~-----o-----*******    |
  328.  
  329.     |   |   |  C7   |             |     *IC3-b*    |
  330.  
  331.     |   |   #       |          C13<>    *+    *----o
  332.  
  333.     |   |           |             |     *     *    |
  334.  
  335.     |   |-----------o             #     *     *    |
  336.  
  337.     |---------------|      C9           *-    *    |
  338.  
  339.                            <>----~---o--*******    |
  340.  
  341.           -------~---------|     R12 |      |      |
  342.  
  343.           |      R7                  |      #      |
  344.  
  345.           |           C15  #         |-------------|
  346.  
  347.           |        |--<>---|------|
  348.  
  349.           |        |       |      |
  350.  
  351.           |--------o---****|****  |                  Handset speaker
  352.  
  353.                    |   *       *--|------------------>
  354.  
  355.           ---------|---*  IC2  *  |
  356.  
  357.           |        |   *       *  |                  Handset speaker
  358.  
  359.           <>C16    |   *       *--o------------------>
  360.  
  361.           |     |--|---*********  |
  362.  
  363.           o-----|  |        R1    |
  364.  
  365.           #        |----o---~-----|
  366.  
  367.                         |   |
  368.  
  369.                         |---|
  370.  
  371.  
  372.  
  373.  
  374.  
  375.  
  376.  
  377. ------------------------------------------------------------------------------
  378.  
  379. (~)=Resistor
  380.  
  381. (<>)=Capacitor
  382.  
  383. (@)=Simiconductor
  384.  
  385. I recomend that you call and purchase a better diagram for the TVS250 from the
  386.  
  387. company listed above.  Remember, to make the scrambler work you must have two
  388.  
  389. TVS250's, one on the callers phone and another on the receivers phone.  I
  390.  
  391. haven't purchased a set yet, but this DOES work, information was gathered from
  392.  
  393. radio electronics.  So, it is a reliable source, not just another dumb text
  394.  
  395. file.  Good luck! ->BB<-
  396.  
  397.