Fixing the NOAC video lines...

G-force · Post by **G-force** » Tue Jul 19, 2005 10:36 am

So you all know how the NOAC's have this really cruddy composite video. So I am wondering how I can fix this on my Super Joy 3?
I have two ideas so far:

A: Use a cap on the line. I heard this works for RGB, would it do the same for composite?

B: (from daves site, thanks dave)

First off the signal is weak, powerful weak!, this causes the video to give out a blurry rf quality siganl. To fix this you have to wire up a video amplifier, a 4NN01 transistor and a few resistors will suffice. Diagram of it to the right (Original design By Benjamin J. Hechendorn).

So would the capacitor thing work? Or do i need to do the transistor mod thing. I would prefer something easy if at all possible. Any other ideas I missed?

Post by **gannon** » Tue Jul 19, 2005 12:10 pm

I'd try either a decoupling capacitor on the video line, or maybe an in line capacitor on it first. If that doesn't help try the amp.

G-force · Post by **G-force** » Tue Jul 19, 2005 2:23 pm

Would a capacitor from a GBO work? It's a 10V, 100 microfarad. I'm not very familiar with capacitors so I have no idea what kind it's called. I think it's electrolitic

Umm, it's black with a white strip on the side

...

So should I have the ground line (the lead near the white line on the side right?) of the cap on ground, and the positive line on the video line?

Or do I have the video line go into one lead of the capacitor and then out the other lead?

nos_slived · Post by **nos_slived** » Tue Jul 19, 2005 2:58 pm

That might work, give it a try. You want the negative lead on ground, and the positive lead on the video line.

Post by **gannon** » Tue Jul 19, 2005 4:01 pm

A decoupling capacitor is where 1 lead is on the video line and 1 is on ground. That should clean up the video signal, but for strengthening it you may want a ceramic capacitor to put in line with the video.