LED screen websites

yuravian · Post by **yuravian** » Wed Feb 23, 2005 8:23 am

okay... I made a portable SNES, but i don't like the idea of hacking the screen myself. Are there any websites where i could order a modded screen, or anyone who could hold on to one for abt a month? (so i can get the money to pay you for it)

G-force · Post by **G-force** » Wed Feb 23, 2005 8:28 am

Well, you don't HAVE to have an LED modded screen.
The fluorescent backlight will work just fine, but use more power. And with the fluorescent you can adjust the brightness

And there are no sites as of yet where you an buy a modded screen (yet

).

yuravian · Post by **yuravian** » Wed Feb 23, 2005 9:15 pm

so how long will the batteries work in that?

G-force · Post by **G-force** » Wed Feb 23, 2005 9:26 pm

Depends on the battery.

HK-47 · Post by **HK-47** » Thu Feb 24, 2005 2:53 pm

Yep, find out the batteries mah, then find out the systems mah draw, then do this:
mah for screen / mah for system =
This should give you how long the system will last in hours.

Post by **gannon** » Thu Feb 24, 2005 2:56 pm

HK-47 wrote: mah for screen / mah for system =
This should give you how long the system will last in hours.

You mean, mah for batteries / (ma for screen + ma for system) = time

HK-47 · Post by **HK-47** » Thu Feb 24, 2005 2:57 pm

gannon wrote:
HK-47 wrote: mah for screen / mah for system =
This should give you how long the system will last in hours.
You mean, mah for batteries / (ma for screen + ma for system) = time

Uh, yeah...Thanks gannon.

Post by **SpongeBuell** » Thu Feb 24, 2005 3:14 pm

well, it should be mAH of batteries / (mA of system + mA of screen)

picky, maybe, but it helps the newbies that couldn't figure it out.
[size=0]gannon mustn't die[/size]

A.J. Franzman · Post by **A.J. Franzman** » Thu Feb 24, 2005 3:29 pm

Thanks, Sponge! The parenthesis are important.

Of course, this equation simplifies to:
time = mAh/mA
You'll have to measure the actual mA flowing from the batteries for this version. If you use a switching regulator, you could find that battery current is LESS than the sum of the system and screen currents.

Also, battery mAh ratings are for very slow discharge, like 10 or 20 hours I think. When you discharge them faster, you get less energy out (more of it goes to making the battery hot). So multiply your "time" result from above by 0.8 or so for a more accurate estimate.

HK-47 · Post by **HK-47** » Thu Feb 24, 2005 3:30 pm

mAh for batteries / (mA for screen + mA for system) = time
The parenthesis are important!

Darn BEDMAS!

Post by **gannon** » Thu Feb 24, 2005 3:31 pm

You do realize that spongey posted a corrected version 15 minutes before you, right?

HK-47 · Post by **HK-47** » Thu Feb 24, 2005 3:32 pm

gannon wrote:You do realize that spongey posted a corrected version 15 minutes before you, right?

It read:

well, it should be mAH of batteries / (mA of system + mA of soup)

picky, maybe, but it helps the newbies that couldn't figure it out.

It did, really!

A.J. Franzman · Post by **A.J. Franzman** » Thu Feb 24, 2005 3:33 pm

Yeah, I was still writing mine. I edited mine to reflect that now.

Post by **SpongeBuell** » Thu Feb 24, 2005 3:49 pm

HK-47 wrote:
gannon wrote:You do realize that spongey posted a corrected version 15 minutes before you, right?
It read:
well, it should be mAH of batteries / (mA of system + mA of soup)

picky, maybe, but it helps the newbies that couldn't figure it out.
It did, really!

Yeah, gannon was jealous when I outsmarted him
[size=0]gannon: I'll kill you if you do not change this post[/size]

Post by **gannon** » Thu Feb 24, 2005 3:51 pm

yeah, but you originally wrote

well, it should be mAH of batteries / (mAH of system + mAH of screen)

which was still wrong