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  1. Path: sparky!uunet!mcsun!uknet!mucs!spec0.ee.man.ac.uk
  2. From: mark-r@spec0.ee.man.ac.uk (Mark Robinson (JO PhD))
  3. Newsgroups: sci.electronics
  4. Subject: Sync Separator summary
  5. Message-ID: <6083@m1.cs.man.ac.uk>
  6. Date: 15 Sep 92 13:44:04 GMT
  7. Sender: news@cs.man.ac.uk
  8. Organization: Dept Electrical and Electronic Eng, Manchester University, UK
  9. Lines: 31
  10.  
  11.  
  12. Thanks to all who replied about my sync separator question. Nearly
  13. every post told me to get an LM1881, and they seem reasonably priced
  14. so that's the course I'll follow. Thanks also to Mika Iisakkila 
  15. (iisakkil@vipunen.hut.fi) who suggested the following circuit for
  16. the black level clamp:
  17.  
  18. MI>                ||100n
  19. MI>   video in >---||--------o----> video out
  20. MI>                ||        |
  21. MI>                          |
  22. MI>              ||220p    |-+
  23. MI>  comp sync >-||--o---o-|   BS170
  24. MI>from LM1881   ||  |   | |-+
  25. MI>                 ---  |   |
  26. MI>                 | | ---  |
  27. MI>              4k7| | / \  |1N4148
  28. MI>                 | | ---  |
  29. MI>                 ---  |   |
  30. MI>                  |   |   |
  31. MI>                  +---o---o
  32. MI>                          |
  33. MI>                         -+-
  34.  
  35. Mark
  36. --
  37. _____________________________________________________________________
  38. Multimedia Information Systems Lab | To err is human, to really screw
  39. Dept. Of Electrical Engineering    | it up takes a co
  40. University of Manchester           | Segmentation fault: core dumped
  41. Dover St. Manchester. M13 9PL      |
  42.