help deciphering (gp2x BOB schematics)

Post by **Triton** » Thu Mar 02, 2006 4:44 pm

http://wiki.gp2x.org/wiki/USB_Host_BoB_Schematic i need these simplified vasue i dont know how to read them!

really just need the USB Filtering and s-video ciphered if you would please!

Radon199 · Post by **Radon199** » Thu Mar 02, 2006 7:34 pm

S-video is really easy, I asume you want to make a cable? Heres how to make one.

1. First of all you need 3 RCA jacks (get a a Yellow, White and Red one just so you don't screw it up) and a 410 pF pot (I think thats what there called... a pot.... ya....maby).

2. Connect the Video Ground to the ground on the Yellow RCA jack (The outside one). Then take the Audio Ground, split it and attach one wire to the White RCA jack ground pin and the other to the Red RCA jack ground pin.

3. Connect the Audio R to the Red RCA jack center pin. Then connect the Audio L to the White RCA jack center pin.

4. Take the Video C and connect it to the 410 pF pot, then connect the Video C to the Video Y wire and the connect that wire to the Yellow center pin.

Wala, I don't have a GP2x, so I really can't test it, but thats what the pic says to me.

Post by **Triton** » Thu Mar 02, 2006 7:39 pm

i plan on building a breakout box of sorts, an addon for the gp2x, it will have 3 usb ports, one specifically for usbwifi and it will have composit jacks for tv out. i have it all figured out too, will have an addon 4 AAs that go on the back.

Radon199 · Post by **Radon199** » Thu Mar 02, 2006 7:46 pm

Well the above explanation works still, just use Female RCA jacks instead of Male. That way you can just plug in a Male to Male cable.

Post by **Triton** » Thu Mar 02, 2006 7:50 pm

the video one i pretty much understood but the usb one!

Post by **Skyone** » Thu Mar 02, 2006 8:06 pm

What don't you get about that?

Post by **Triton** » Thu Mar 02, 2006 8:45 pm

what the zig zags are, what the arrow made of short lines is and what the numbers mean i assume they are valuse for the zig zags. as i said i dont know how to read those things

Post by **marshallh** » Thu Mar 02, 2006 9:26 pm

Post by **Skyone** » Thu Mar 02, 2006 9:30 pm

Marshall, did you eat some of the circuit?

Radon199 · Post by **Radon199** » Thu Mar 02, 2006 9:51 pm

lol, just as I suspected, I was gonna say something but then I thought, if I mix something up, it could cause your GP2x to explode.... (not really but i'm not gonna be responsible

)

Your also gonna need this, to make the VUSB...

Looks like the bigest problem is geting that DC to DC converter that upscales from 3.3V to 5V

Post by **Triton** » Thu Mar 02, 2006 11:27 pm

wont need that bit, gonna use 4 extra AAs for to power stuff over USB

dj-spuddy · Post by **dj-spuddy** » Fri Mar 03, 2006 11:40 am

Sounds really great, if you do actually make this can you please make some sort of tutorial. Also instead of 4 aa's could you not tap into the 5v+ from the usb cable?