Jump to content

Recommended Posts

Hello,

I have the MAX4217 in a circuit as shown in the picture below. The Video In is coming from an Airvawe receiver, and verified right at the input pins there is video signal, however on the output the video is black. What is the problem?

Thanks,

post-6-1182611206_thumb.jpg

Link to post
Share on other sites

Begin with this list.

1. Delete the A/C coupling cap (C3) on the input.

2. Install the two 75 ohm output resistors (R4,R5) in-series with the output signal (not as shown).

3. In addition to the 75 ohm output resistors, install two 470uF caps in-series with them too. The Plus side towards the MAX chip.

4. Go back and verify all other connections. Have a new set of eyes check it for you.

Link to post
Share on other sites

With C3 you're getting rid of the RX's DC bias. But your amp requires it, because otherwise it will receive a negative voltage on the input. It can't handle that with only a positive supply. That's why you put the caps on the outputs :)

Link to post
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

×
×
  • Create New...