Help with wiring a 9v screen to 12v

If you are interested in what i am doing with my wii check it out ( http://www.wiinode.com/forums/index.php?showtopic=4280 ?... ) As you can see with my site i have a screen that uses 9v and i need it to be used along with the wii (so i only have to carry around ONE plug in) i have my amp wired to my wii using 5v and it works great. I need my screen to work alongside my wii. Ive tryed a 9volt battery before but some reason i get a blank screen but my ps1 7v power connector makes it light up good.when i plug 5v on the screen it leaves it very dim. There is 12v also there are alot of 5v points and some 3.3v points on the wii, could i combine them in some way to recieve my needed voltage or use the 12v? anything thats not to costly or spacey (need my smallage so i can have a small case) and please dont post about me NOT needed to do this thank you. if you need more info say so and ill update the question. I KNOW THE RISK INVOLED WITH WHAT IM DOING!

please also note that pics are old. Just giving them for info purposes. Please ask me if you need any other details. :) thank you

EDIT: fixed the link.

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Wiimote Master (author) 9 years ago
Thanks guys, this is the one place i can count on for finding things out :D
zachninme9 years ago
You can get a 9v regulator...
Perhaps hooking a 12V to the +ve and 3.3V to the -ve could work...
Wiimote Master (author)  whatsisface9 years ago
Could you explain alittle more oon how to do this?
He's saying hook up 12V as Vcc, our your main power, and 3.3V to the ground. The differental voltage is 8.7v, close enough.

I wouldn't reccomend this at all, however, since any grounding will cause 12V to go through it.

The heatsink wouldn't need to be *that* big, I don't think. You may have to see for yourself, but it shouldn't be gigantic.
Wiimote Master (author)  zachninme9 years ago
guyfrom7up9 years ago
you could buy that reguator, its a fair price. You probably don't need a heatsink, 12 volts is not much more than 9 volts. Or you could just attach it to a part of the metal with thermal glue.
guyfrom7up9 years ago
umm your link didn't work for me, but can you ask your question in as little words as possible? lol, I'm getting confused of what your asking
i think he wants to know where to get 9 volts. either: 1) use a 7809 or similar v-reg rated for 9 volts. make sure to attach the vreg to a heat sink, as it will heat up. 2) like i told guyfrom7up on another thread about leds, use a zener diode to regulate the 12 down to 9 3)follow whatsisfaces advice. this trick only works on dc voltage though, and attach the 3.3 wire directly to the power supply, NOT some hookup point on the main board.
forgot to mention it: you could simply use a resistor
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