Quote:
Originally Posted by 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
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Hi John - yes my isolators did arrive, but I wasn't very happy with them. For a start they only ran at USB 1.1 speeds - not great. Then secondly I was still getting problems even with them connected. By trial and error I was able to localise the problem to the dodgy eBay power supply for the 550D. If I ran the camera off its battery, I had no problems.
So my solution was to buy a DC-DC converter from Andrews Communications that gives me the correct voltage for the Canon, and use the dummy battery from the dodgy power supply. Then it was snip-snip solder-solder and hey presto I can now run my 550D off my 45 amp hour AGM deep cycle battery - should last several days before needing recharge. Not the most elegant solution - I would like to have been able to solve it with my setup as it was (now I have to lug said battery with me on field trips...) but I am no electronics whiz by a long shot, and so took the path of least resistance (pardon the pun)
My theory is that if I paid the big bucks for a genuine canon power supply, I wouldn't have had any problems...maybe?
Regards
Adam