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  1.  
  2. ******************* FILE 6 of 6 FILES **********************
  3.  
  4. (C) 31 JUL 88
  5.  
  6. Eric Gustafson,  N7CL
  7. 2018 S. Avenida Planeta
  8. Tucson, AZ 85710
  9.  
  10.  
  11.  
  12.           DPLL  Derived Data Carrier Detect (DCD)
  13.           For Filter Based and Single Chip Modems
  14.  
  15.                                                                                $
  16.                               Figure 1                                         $
  17.                                                                                $
  18.             ASCII Representation of DCD Circuit Schematic                      $
  19.                                                                                $
  20.                                                                                $
  21.        //=================7 wire BUS * ================\\                      $
  22.       ||                                                ||                     $
  23. +5 V>-----------+--+---------------+--+--+--+--+----------------+-----+        $
  24. supply||        |  +---|(---G      |  |  |  |  |        ||    __|___  |        $
  25.       ||        |     10uF         |  |  |  |  |        ||   | 14   | |        $
  26.       || +------+------+      +----+--+--+--+--+------+ ||   |      | |        $
  27.       |\-| 3   20     2|------|10  28 27 26 23 1    11|-/|   | U3   | |        $
  28.       |\-| 4          5|------| 9                   12|-/|   |74HC14| |        $
  29.       |\-| 7   U1     6|------| 8         U2        13|-/|   |      | |        $
  30.       |\-| 8          9|------| 7                   15|-/|   |__7___| |        $
  31.       |\-|13 74HC374 12|------| 6       27C64       16|-/|      |     |        $
  32.       |\-|14         15|------| 5                   17|-/|      G     |        $
  33.        \-|17         16|------| 4                   18|-/             |        $
  34. DATA>----|18 11 10 1 19|------| 3 25 24 22 21 20  2 19|--/\/\/\/---+  |        $
  35. from     +---+--+--+---+      +----+--+--+--+--+--+---+    4.7K    |  |        $
  36. modem chip   |  |  |               |  |  |  |  |  |                |  |        $
  37.              |  |  |               |  |  |  |  |  |           +----+  |        $
  38. CLK >--------+  +--+               +--+--+--+--+--+           |       |        $
  39. input from         |               |                          |  Q1   |   Q2   $
  40. X16 or X32 baud    G               G                          |     E-+-E      $
  41. clock source                                                  |   |/ 2N  \|    $
  42.                                                               +-B-| 3906  |-B-+$
  43. GND >---G                                                         |\ (2) /|   |$
  44.                                                                     C-+-C     |$
  45.                                  1N4148                               |       |$
  46. DCD <--------+                +----|<|----+        +------------------+       |$
  47. out     U3D  |   U3C     U3B  |           |   U3A  |                          |$
  48. ___    8 /|9 |  6 /|5   4 /|3 |   220K    |  2 /|1 |   470K                   |$
  49. LED <--o< |--+--o< |--+-o< |--+--/\/\/\/--+--o< |--+--/\/\/\/--G              |$
  50. out      \|       \|  |   \|  |                \|  |                          |$
  51. ___                   |       |   0.47uF           |   0.1uF                  |$
  52. DCD <-----------------+       +----|(-----G        +----|(-----G              |$
  53. out         100K                                                              |$
  54.        +--/\/\/\/--G                                                          |$
  55.        |  U3F                                                                 |$
  56.        |13|\12                           __                    10K            |$
  57.  CD >--+--| >o------+------------------< CD  <---------+-----/\/\/\/----------+$
  58. from      |/        |                   JMP1           |                       $
  59. modem               |                 (AMD7910)        |                       $
  60. chip                |  11|\10                          |                       $
  61.                     +----| >o----------< CD  <---------+                       $
  62.                          |/             JMP2                                   $
  63.                         U3E           (TCM3105)                                $
  64.                                                                                $
  65.                 NOTE:  Only JMP1 OR JMP2 installed NOT both!                   $
  66.                                                                                $
  67.                     *  BUS wire connections are in order                       $
  68.                        vertically.  Top pin goes to top                        $
  69.                        pin bottom pin goes to bottom pin                       $
  70.                        etc.                                                    $
  71.  
  72. EOT
  73. EOF