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Text File  |  1988-09-03  |  4KB  |  74 lines
  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
  74.