home *** CD-ROM | disk | FTP | other *** search
/ NetNews Usenet Archive 1992 #31 / NN_1992_31.iso / spool / comp / sys / ibm / pc / hardware / 34039 < prev    next >
Encoding:
Internet Message Format  |  1992-12-23  |  3.5 KB
  1. Xref: sparky comp.sys.ibm.pc.hardware:34039 comp.sys.ibm.pc.soundcard:5709 rec.music.synth:19611 comp.music:5779
  2. Newsgroups: comp.sys.ibm.pc.hardware,comp.sys.ibm.pc.soundcard,rec.music.synth,comp.music
  3. Path: sparky!uunet!mcsun!sun4nl!oce.nl!rvdm
  4. From: rvdm@oce.nl (Ruurd van der Meer)
  5. Subject: A working MIDI connector box for PAS 16 and Soundblaster
  6. Message-ID: <1992Dec22.081317.1007@oce.nl>
  7. Originator: rvdm@st13-sys4
  8. Sender: news@oce.nl (USENET News System)
  9. Organization: OCE Nederland B.V.
  10. Date: Tue, 22 Dec 92 08:13:17 GMT
  11. Lines: 58
  12.  
  13. (Re:Re: Looking for that Sound-Blaster to MIDI circuit again.)
  14. The next circuit shows a MIDI connector box for soundcards. Often these use
  15. the game connector for MIDI. Pin 12 and pin 15 are resp. midi transmit and midi
  16. receive. A joystick can still be connected, because these pins do not conflict.
  17. Just put also a 15 pin game connector on your MIDI box if you want. 
  18. A part of this scheme (for the Soundblaster card) I found on the net some weeks ago. This scheme also works for the Pro Audio Spectrum 16. There are two IC's,
  19. some resistors and a 1N914. To test the box: connect midi in with midi out, 
  20. and run "MIDITEST", a program supplied with the PAS 16. If it fails, change 
  21. the resistor 5K6, which value strongly depends on the optocoupler used. 
  22.  
  23.  
  24. 15 pin D connector             
  25.                                           220R
  26. pin-1 +5v ----+--------------------------/\/\/\---------------\
  27.               |                                                \ 4
  28.               |                                          Gnd--2      MIDI OUT
  29.               |      |\      |\            220R                / 5
  30. pin-12 tr >---|------| o-----| o----------/\/\/\--------------/
  31.               |    14|/ 13 12|/ 10
  32.               |                            220R
  33.               +---------------------------/\/\/\-------------\
  34.               |                                               \ 4
  35. pin-15 rx <---|--------------------+                    Gnd--2      MIDI THRU
  36.               |      |\      |\    |        220R              / 5
  37.               |   +--| o-----| o---+-------/\/\/\------------/
  38.               |   | 1|/ 2   3|/ 4   
  39.               |   |                 
  40.               |   +------+
  41.               |   5K6    |                       220R
  42.               +--/\/\/\--+    +------+----------/\/\/\--------\
  43.               |B         |C   |A     |                         \  4
  44.             +-|----------|----|-+    |                                MIDI IN
  45.             |  8        6     2 |  -----                       /  5 
  46.             |                   |   / \ IN914               +-/
  47.             |      6N135        |   ---                     |
  48.             |                   |    |                      |
  49.             |           5     3 |    |                      |
  50.             +------------|----|-+    |                      |
  51.                          |    |K     |                      |
  52. pin-5 Gnd  --------------+    +------+----------------------+
  53.  
  54.  
  55. -+- is a wire connection.
  56.  |
  57.  
  58. 6N135 is a high speed optoisolator, the output current is not so high (6N139
  59. is better). But if you buffer output 6 (with LS7404) it will work. 
  60. Invertors : IC LS7404.
  61. Note: Do not connect MIDI IN pin 2 to Ground 
  62. Good luck !
  63.  
  64. Ruurd van der Meer (rvdm@oce.nl)
  65.  
  66.       ###########################################################
  67.       #  This note does not necessarily represent the position  #
  68.       #     of Oce-Nederland B.V. Therefore no liability or     #
  69.       #      responsibility for whatever will be accepted.      #
  70.       ###########################################################
  71.