Let's see if I can figure out how to include images.

Anyway, 2 pics.

The first shows the new switch. (My camera doesn't focus down that small. Yes, it even says "ON" on the top of the switch. :-)

In the other, you can kind of see the new power wire.
(It's the red wire near the large cap. :-)

desiv

Ok I have an update also:

This mod allows you to switch between using the hub as a hub, and tapping off the voltage regulator in the hub to charge the N800. Originally I thought you could do both simultaneously but discovered the hub batteries drained *VERY* quickly and drained the N800. So just to be clear, with the switch I describe adding in the picture, you can have the hub connected OR the power/charging cable connected to the N800, but you must use the switch to choose which function you want to do. If you have both cables connected simultaneously it will not harm the N800, but both the Hub and N800's batteries will drain quickly (like about an hour).

The red & black wires you see going off the bottom of the picture go to the 4xAA battery pack.

The yellow circles point out the GND and 5v which the N800 charging cable connects to. The yellow line drawn from the connector to the yellow circle is just to clarify where the wires go to. The inner tip of the charging connector is 5v and the outer part is GND.

The yellow/red line with the arrow points to the spot where a wire I don't have shown connects to the 3rd terminal on the switch diagram I have drawn on the right side of the picture.

When the switch is in the charging position (NOT the switch built into the hub), both the red and blue lights on the hub with come on.

Also, just a reminder, I replaced the original USB cable with the mini one and shorted pins 4 & 5 inside the connector to trigger host mode.

Ok, I'll update this post if I notice any errors or if someone needs clarification.

Looks good. I haven't bothered with trying to charge my 770 from the hub yet.

Hey, that reminds me.
I did have to do one other thing to make it work.
(And this should only be for the 770 I believe???)
In my scripts to choose host or slave, I have this:

echo host > /sys/devices/platform/tahvo-usb/otg-mode
/etc/init.d/ke-recv restart

and

echo peripheral host > /sys/devices/platform/tahvo-usb/otg-mode
/etc/init.d/ke-recv restart

(I had to add the ke-recv restart to get it to kick in. Also, on my 770 (OS2006), on a reboot, it goes back to slave mode.)

Then I added those scripts to the /etc/sudoers file so I can run them as a user, and I have them in my LoadApplet/CPU/MEM statusbar applet.

desiv

Can this work with the N900 too? (Charging the N900 while powering up the devices connected to this hub)
In that way you could connect a portable hard drive to the N900 that needs more energy than the N900 can provide and power it using this hub while simulteneously charging the N900.

It might work with the N900, but not for powering an external hard drive, not even the little 2.5" laptop drives that get their power from using 2 USB ports. I did have it working with an external drive that was plugged into an AC wall adapter, but this was ages ago.