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time base corrector

Discussion in 'Electronic Repair' started by bong, Oct 4, 2005.

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  1. bong

    bong Guest

    i would to ask anyone to provide me with a time base corrector
    schematic diagram and corresponding components that was used, i would
    like to build one for me. i'm having a problem with the sync of our
    video, someone told me that a time base corrector could somewhat solve
    my scrambling video. your help is highly appreciated and thank you very
    much, hope i'll get a response the soonest.
     
  2. Dave D

    Dave D Guest

    They told you wrong I'm afraid. If there is a fault with your VCR then
    nothing you do externally to the video signal is going to help matters. A
    time base corrector is generally a standalone box inserted in the video
    connection between the VCR and the source you are recording from, which
    'tidies up' a poor video signal, eg recording from a worn, jumpy tape. It
    will not make a malfunctioning VCR work properly, nor can it affect
    recordings made via the aerial.

    If the problem was an unstable video signal into the video, eg if you were
    recording from one VCR to another copying from a jumpy tape, then maybe it
    would help.

    Dave
     
  3. bong

    bong Guest

    Ayon kay Dave D:



    Dave

    That's exactly my problem, i get unstable video when recording, so time
    base corrector would really help me? if so, would you have a schematic
    diagram of a time base corrector or anyone in the group has a copy of
    the diagram, i would appreciate it very much, i would like to build one
    for myself, coz i enjoy building circuits or projects during my free
    time. Thanks in advance.
     
  4. bong

    bong Guest

    Ayon kay Dave D:



    Dave

    That's exactly my problem, i get unstable video when recording, so time
    base corrector would really help me? if so, would you have a schematic
    diagram of a time base corrector or anyone in the group has a copy of
    the diagram, i would appreciate it very much, i would like to build one
    for myself, coz i enjoy building circuits or projects during my free
    time. Thanks in advance.

    Bong
     
  5. Guest

    You don't get it I guess.

    Here goes. A time base corrector doesn't just tidy up the signal. It is
    a variable digital delay which brings video "back into sync" after a
    (usually) helical scan VTR has screwed it up once the tape had
    stretched. There are not many other uses for a TBC.

    To correct a bad video with a TBC you need to be in manual mode all the
    time and have a VTR with a flying erase head so you can edit it
    correctly. To design such a device you need to know how to manipulate
    BBDs at the least, and if you want a good one you better know analog
    video. Plus with a TBC, the color must be dealt with seperately if you
    are "fixing" bad video.

    If your system used to record well, why don't you just have the
    machines cleaned ? (and NO a cleaning tape willl not work).

    J
     
  6. Dave D

    Dave D Guest


    I don't think you understand what I said. If the problem is with your VCR
    then a TBC will *not* help you. You need to get your VCR serviced.

    No, not if you have a problem with your VCR.

    Dave
     
  7. I remember the old BVU U-matic VCRs. A TBC was indispensable for
    broadcasting and it worked on a line base not on a frame base. And
    that was professionell equipment

    With VHS I can see the line jitter on the screen.
     
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