×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!
  • Students Click Here

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

Jobs

Composite and S-Video question

Composite and S-Video question

Composite and S-Video question

(OP)
I have been searching around unsuccessfully for a solution to my problem.  Please forgive me if it is a basic or trivial problem, I am an ME, not an EE.

I am modding a colecovision for composite and s-video output.  I want to offer both.

right now I have:


chroma               ________________________s-video
____________________/
                    \__________________
                                       \_________composite
luma                 __________________/
____________________/
                    \________________________s-video

I am getting a lot of interference in both signals.  I am only testing one signal at a time.  I can understand why I'm getting interference in the s-video signal, but why would this give me interference in the composite signal?

More importantly, how do I fix the problem?  

Thanks,
Steve

RE: Composite and S-Video question

Are you just tying the chroma and luma signals together directly or are you using caps?

Dan - Owner
http://www.Hi-TecDesigns.com

RE: Composite and S-Video question

(OP)
no cap, just tying the two together

RE: Composite and S-Video question

You need a cap in the chroma line... without it you're going to get the color burst signal bleeding into the luma signal.  Figure something in the 1nF range should be good.

Dan - Owner
http://www.Hi-TecDesigns.com

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members!


Resources