wiring diagram

blackbox_dev · Post by **blackbox_dev** » Sat Jan 28, 2006 4:38 pm

I need somebody to make me a diagram with how to hook up my batteries. Here are the specs of the batteries:

- NiMH 1.5v
- 1800 mAH (1.8aH)

I need the output to be 12v at 4000mAH or higher.

(P.S. every one on this forum has been really helpful in doing the research for constructing my portable

)

Post by **marshallh** » Sat Jan 28, 2006 4:42 pm

You're gonna need TONs o' batteries for that.

Let's see...
12v/1.2v = 10 cells

10 cells in parellel X 3 = 30 cells, = 5400mAh

That's gonna be pretty heavy!
I suggest using 7.2v and building a switching regulator. (LM2576.)

blackbox_dev · Post by **blackbox_dev** » Sat Jan 28, 2006 4:44 pm

wow, didnt know it would be that much! i guess if it would be that expensive i should get a lighter li-poly battery (12v 6000mah) and a smart charger.

timmeh87 · Post by **timmeh87** » Sat Jan 28, 2006 9:40 pm

where did you find a 12v li-poly... theres no such thing.

blackbox_dev · Post by **blackbox_dev** » Sun Jan 29, 2006 11:28 am

sorry, it isnt a li-poly, it was a NiMH. I was thinking about a 14.8v li-poly or something, but here is the link to the NiMH : http://www.batteryspace.com/index.asp?P ... AID=101040

Turbo Tax 1.0 · Post by **Turbo Tax 1.0** » Sun Jan 29, 2006 12:03 pm

you do know that the N64 doesnt require 12 volts it only nees 7.2

blackbox_dev · Post by **blackbox_dev** » Sun Jan 29, 2006 1:11 pm

yeah, maybe I will use 7.2 volts if I can run the PSOne screen off it. Can I?

EDIT: My free TI DC/DC needs at least 9 volts. So, I can still power the 12 volt line off that, use the DC/DC for the 3.3v line, and then will 9 volts run the PSOne screen or will it fry it?

Turbo Tax 1.0 · Post by **Turbo Tax 1.0** » Sun Jan 29, 2006 1:21 pm

I HEARD THOSE DC-DC CAN RUN OFF 7.2 AND YES PSONE SCREENS TAKE 7.2

damn it i had caps on

blackbox_dev · Post by **blackbox_dev** » Sun Jan 29, 2006 1:45 pm

yeah, I was pretty sure a PSOne screen could take 7.2v. Has anyone here ran a DC/DC from TI off 7.2v? Because it says it needs 9 minimum.

BTW, the one ill be using is the PT78HT233

joevennix · Post by **joevennix** » Sun Jan 29, 2006 1:56 pm

I'm having the same problem and I'm about to test it out... The worst that can happen while using 7.2V batts with the TI DCDC converter is jumpy voltage... small jumps mind you. I'll try it out and get back to you.

joevennix · Post by **joevennix** » Sun Jan 29, 2006 2:16 pm

It works great!

bioniclebert · Post by **bioniclebert** » Sun Jan 29, 2006 2:47 pm

Yes. I used the battery also and I played star fox for a little bit without errors. I do advise you to play it for a long time to see if the graphics distort so that this is a shure prooven way to work.

daguuy · Post by **daguuy** » Sun Jan 29, 2006 3:29 pm

yeah play it for at least a half hour to make sure it doesn't distort

blackbox_dev · Post by **blackbox_dev** » Sun Jan 29, 2006 6:49 pm

ok, great!
here is how I will get power then:

7.2v battery to 12v line
7.2v battery to PSOne screen
3.3v DC/DC to 3.3v line

thanks for the info!

timmeh87 · Post by **timmeh87** » Sun Jan 29, 2006 7:45 pm

its actually a 3.3v line, not 3v as you stated. you might have known that but im just making sure.