Amplifying composite? [56k]

[samjc3]

i have been looking into running an FC-16 GO without the larger of the two boards, and i do have it working. (there will be a guide soon, worry not) However, when i hook video up to a 3.5" screen (number two from hail's review) and the picture is a little fuzzy and very dim and off color. i hooked it up to my TV, a psone screen and my madcatz gamescreen and the quality was fine. my guess is that the 3.5" doesnt have a built in video amplifier. any ideas on how to fix it? i assume if i just run the video through some sort of amplifier it will be fine?

and, yes, that is what the screen really looks like. it not a bad picture.
EDIT: it isnt the screen either. it works fine with other video inputs and i tested several other of my 3.5" screens and they all done it.

 

[hailrazer]

I have tried it with all my 3.5" screens and composite from the old Lcd and from the video out and they all worked fine with a 7.4v battery.

My guess is you have a voltage problem with the screen or an interference problem if using a step up regulator.

 

[samjc3]

I have tried it with all my 3.5" screens and composite from the old Lcd and from the video out and they all worked fine with a 7.4v battery.

My guess is you have a voltage problem with the screen or an interference problem if using a step up regulator.

are you using the video out on the daughterboard? i get fine video there. but i am running video straight off the small board with the cart slot attached. power is via 7.4v li-poly's and a 7805 (and a ld33 for the controller). i can run it off the power fine with the daughter board attached, but without it i get these results. i assume that all the stuff on the daughterboard that the video signal is routed through is a video amplifier, but i cant use that. also, keep in mind that my FC-16 is a v2, so there may be some differences.

 

[XCVG]

http://www.instructables.com/files/deri ... MEDIUM.gif

It's for NES, but it should work, though you may have to change some resistor values.

 

[samjc3]

Thanks! i will try it and see if it works

 

[samjc3]

XCVG = AWESOME

it turns out that i didnt need an amp. i needed a resistor. when i made the amp xcvg posted the quality was just crazy bad. (like, pure fuzz) so i thought about it and slapped a resistor on the line. now it works fine. the quality isnt perfect, but its better than the original screen (from the FC-16 go) so i am not complaining.

 

[zeturi]

Wow. WOW! Dude, once you figure out mA consumption, post it. I will make a SNES portable out of one of these. Some day.

HEY, WAIT ONE SECOND! I AM EASILY TRICKED. DID YOU TRICK ME ON APRIL FOOLS DAY?!

 

[samjc3]

nope. this is 100% real. i guarantee it.

 

[Mario]

Check the mA draw of the screen, will you?

Also, link to a pic in my Instructable = sweet.

 

[samjc3]

its #2 from hails review, so 124mA at 7.4 volts.

 

[Mario]

Ah, thanks. Also, nice portable you got goin' there.

 

[samjc3]

no, thank you