time base corrector

[bong]

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.

 

[Dave D]

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.

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

 

[bong]

Ayon kay Dave D:

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

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]

Ayon kay Dave D:

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

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

 

[[email protected]]

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

 

[Dave D]

Ayon kay Dave D:




Dave

That's exactly my problem, i get unstable video when recording,

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.

so time
base corrector would really help me?

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

Dave

 

[Martin D. Bartsch]

All vcr's have a very stable horizontal rate but the vertical is often

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.