[JohnH]

Hi Adam did your USB isolators arrive yet? Did they fix your problems?

I am having very similar issues here with a G11G (new type - rocker switch and round motor connections) and a similar setup.

In my case I have the G11G powered buy a Jaycar 13.8V regulated PS, that also provides power to the dew heaters and my moonlite stepper focus controller.

Also running off the same mains socket are a PS for a powered usb hub and the camera power supply.

The laptop connects to the G11G via the usb hub and then a Belkin usb to serial converter, the camera and focus controller are also connected to the hub.

What I found was USB timeouts when image downloads were in progress. I thought to fix that with a second USB cable direct to the camra but when I made the connection at the laptop I got a spark from the USB shield. That stopped me in my tracks!

I measured a 24.7 V poterntial difference between the usb shields on the camera usb cable and devices connected to the Jaycar PS.

I think I can avaid this issue if I swap the ST2k power supply for the DC version and run everything of the Jaycar PS but I am reluctant to experiment for fear of blowing up something expensive. So far I only seem to have fried the USB hub.

Can anyone confirm if this idea is sound?

Regards