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Text File  |  1991-09-08  |  3KB  |  64 lines
  1.                     +5 VDC  ┌───────┐ U1
  2.                        <──┐ │ MC1489│
  3.                ┌───       └─┤14    3├─────────────┐
  4.                │ 4 *─┐  ┌───┤1     2├───┐         │
  5.                │ 5 *─┘  │   │   7   │  ─┴─ C1     │        ──┐
  6.         RS-232 │ 2 *────┘   └───┬───┘  ─┬─ 330 pF └──────* 3 │ CAT
  7.        (DB-25) │ 3 *──────┐     ├───────┘      ┌─────────* 1 │ (MINIDIN)
  8.                │ 7 *───┐  │    ┌┼┐       ┌┬┬───┘  ┌──────* 2 │  6 PIN
  9.                │ 6 *─┐┌┼┐ │    │││       │││      │        ──┘
  10.                │20 *─┘│││ │ ┌───────┐ U2          │
  11.                └──        │ │ MC1488│             │
  12.                           └─┤3     2├────┬────────┘
  13.                    ┌────────┤14     │    \ R1
  14.           +10 VDC <┘    ┌───┤1  7   │    /  2.2K
  15.           -10 VDC <─────┘   └───┬───┘    \
  16.                                 ├────────┘
  17.                                ┌┼┐
  18.                                │││
  19.  
  20.  
  21.                      Fig 1. The Circuit Diagram
  22.  
  23.  
  24.  
  25.                     1 AMP                       ┌───────────────> +9 VOLTS DC
  26.                     FUSE   1N4001  1┌───────┐3  │ 1┌───────┐3
  27.                  ┌─o───o─┬───┬─>|──┬┤ 7809  ├───┼──┤ 7805  ├─┬──> +5 VOLTS DC
  28.                  │       │   │     │└───┬───┘   │  └───┬───┘ │
  29.     ──────()││()─┘       │   └─||──┤    │2      │      │2    │
  30.   110 VAC ()││() 18 VAC  │ 0.1 uF  │+   │       │+     │     │+
  31.           ()││()         │   1000 ─┴─   │      ─┴─10   │    ─┴─10
  32.     ──────()││()─┐       │    uF  ─┬─   │      ─┬─ uF  │    ─┬─ uF
  33.                  └─o/ o──)────────┬┴────┼───────┼──────┴─────┴──>  COMMON
  34.                   SWITCH │    1000│+    │       │+
  35.                          │     uF─┴─    │      ─┴─10
  36.                          │       ─┬─    │1     ─┬─ uF
  37.                          │ 1N4001 │┌────┴───┐3  │
  38.                          └───┬─|<─┼┤  7909  ├───┴───────────────> -9 VDC
  39.                              │    │└────────┘
  40.                              └─||─┘ 2
  41.                               0.1uF
  42.  
  43.  
  44.                      Fig. 2. Typical Power Supply
  45.  
  46.                   Taken from Aug 1988 - 73 Magazine (pg. 54)
  47.                         Designed by Mike Roberts N9CLX
  48.  
  49.  
  50.                                 Parts List
  51.  
  52.                          MC1488 -        Radio Shack # 276-2520
  53.                          MC1489 -         "      "   # 276-2521
  54.                          Dual IC Board -  "      "   # 276-159
  55.                          DB-25 Conn's     "      "   # 276-1548 & 276-1536
  56.                          Cabinet          "      "   # 270-210
  57.                          2.2k Resistor
  58.                          330 pF Cap
  59.                          LED
  60.                          SPST Switch
  61.                          Cable (twisted Pair W/shield)
  62.                          6 Pin Mini-Din  Edlie Electronics # 7372-78
  63.                          Power Supply (Typical Pictured Above)
  64.