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  1.  
  2.         1200 Baud AFSK Modem für Atari ST am RS232 Port
  3.           Stromversorgung aus der RS232 Schnittstelle
  4.             Treiber-Software L2STX (c) 1994 OE5DXL
  5.  
  6.  
  7. RS232
  8. Pin            ---------
  9.      D1        !       !
  10.  4 o--!>!--*---! 78L05 !----*--------+
  11.      D2    !   !       !    !        !
  12. 20 o--!>!--*   ---------    !        !
  13.            !       !   100nF!        !
  14.      47uF ===      !       ===       !
  15.      16V  ---      !        !        !
  16.            !       !        !        !
  17.  7 o--+   ---     ---      ---       !
  18.       !                              !
  19.       !                              !
  20.      ---             ------------    !
  21.                    8 !          !1   !            -------
  22.  3 o-----------------! RxD   +5V!----*         +--! 10k !------o Nf
  23.                      !          !10  !   100nF !  -------
  24.      ------- D3    14!          !----*        ===     +-----+
  25.  2 o-! 47k !--!>!-*--! TxD      !4   !         ! 100nF!     !
  26.      -------      !  !       in !----+---------+     ===   ---
  27.                   !16!          !11  !                !    ! !
  28.   33pF +-----*----+--!       out!----+----------------+    ! !<--o Mic
  29.       ===    !    !  !          !    *---------------+ 10k ! !
  30.        !    ---   !  !          !   ---              !     ---
  31.       ---  -----  !  !          !   ! !              !      !
  32.   4.433619 !   !  !  !          !   ! !15k           !     ---
  33.      MHz   -----  !  !   3105   !   ! !              !
  34.             ---   !  !          !7  ---  -------     !
  35.              !    !15!       lev!----*---! 18k !--+  !
  36.              *----+--!          !2       -------  !  !
  37.         33pF !    !  !          !----+           --- !
  38.             ===   !  !          !5   !               !
  39.              !    !  !          !----+               !
  40.             ---   !  !       gnd!                    !
  41.                   !  ------------                    !
  42.                   !  13! 12!  9!                     !
  43.                   !    !   !   !                     !
  44.                   !   --- --- ---                    !
  45.                   !                                  !
  46.                   !    +---*--*---------------*------*
  47.                   !    !   !  !              ---    ---
  48.                   !  10! 16! 3!          180k! !330k! !  BC547 o.ä.
  49.                   !  ------------            ! !    ! !
  50.          -------  ! 2!          !5   ------- ---    --- !------oPTT
  51.       +--! 33k !--*--!          !----! 18k !--+------+--!
  52.       !  -------     !          !    -------  !      !  !>--
  53.      ---           13!          !15           !      !     !
  54.                   +--!          !-------------*      !     !
  55.                   !  !          !             !      !    ---
  56.                   !11! 74HC123  !       100nF===     !
  57.                   +--!          !14           !      !
  58.                      !          !-------------+      !
  59.                      !          !7                   !
  60.                      !          !--------------------*
  61.                      !          !        (100uF)47uF===  PTT-Watchdog-Zeit
  62.  D1..D3 1N4148 o.ä.  !          !6                  ---
  63.                      !          !--------------------+
  64.                      ------------
  65.                       1!  8!  9!
  66.                        !   !   !
  67.                       --- --- ---
  68.  
  69. + sind nur Überkreuzungen oder Ecken
  70. * sind Verbindungen
  71. Viel Spaß beim Löten
  72.  
  73.