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Old 18th September 2009, 10:43 PM   #1
cuibono is offline cuibono  United States
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Default USB galvanic isolation

Check out this cool new gizmo:

http://www.circuitsathome.com/mcu/usb/usb-isolator

It isolates usb device's ground connections. For instance, my laptop causes my usb soundcard to hum when connected to an amp - I use a ground lifter on the laptop to get rid of it, but this gizmo is probably safer.
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Old 19th September 2009, 04:22 AM   #2
star882 is offline star882  United States
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Use a fiber optic link. It's commonly available and very, very effective at isolation.
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Old 19th September 2009, 04:33 AM   #3
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Thanks for bringing this to our attention!!!

I've been waiting for a simple solution like this to come along.

Now I can do a USB -> I2S DAC without fear of ground loops and noise from the PC. I'm glad I never got around to wasting any time on a USB -> SPDIF solution.

Last edited by theAnonymous1; 19th September 2009 at 04:36 AM.
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Old 19th September 2009, 05:15 AM   #4
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Very Nice. I hadn't realized that ADI makes an ADuM specifically for USB. They are great little isloators! (I think Silicon Labs make some as well)

This usb isolator is precisely what soundcheck was looking for in this thread:
USB DAC isolation ?

In which I suggested ADuM parts and seem to have been largely ignored

Looks like someone beat us there anyway
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Old 25th September 2009, 06:19 PM   #5
HaLo6 is offline HaLo6  United States
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thats awesome I can use that to isolate all the USB-Inputs for my jukebox! I just bought two PCB's , AD is sending two samples of the ADuM chip!

Last edited by HaLo6; 25th September 2009 at 06:35 PM.
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Old 26th September 2009, 07:40 PM   #6
Korrah is offline Korrah  Malaysia
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Just making sure here, this little gadget also allows us to supply a clean 5V to the USB device right?
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Old 27th September 2009, 03:15 PM   #7
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Quote:
Originally Posted by Korrah View Post
Just making sure here, this little gadget also allows us to supply a clean 5V to the USB device right?
You have to add a seperate 5V supply to the device, clean or not.
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Old 29th September 2009, 02:11 PM   #8
Ipanema is offline Ipanema  Malaysia
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Quote:
Originally Posted by star882 View Post
Use a fiber optic link. It's commonly available and very, very effective at isolation.
Do you mean something like this? http://cgi.ebay.com/ws/eBayISAPI.dll...%3DI%26otn%3D2

May I know how will the optical transmitter improve the jittery output feed from SPDIF of PCM2902?
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Old 30th September 2009, 03:33 AM   #9
Korrah is offline Korrah  Malaysia
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No, what he meant was this: http://www.usb-shop.com/opticis.html

Quote:
You have to add a seperate 5V supply to the device, clean or not.
Fair enough, but its 7-25V actually
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Old 30th September 2009, 05:43 AM   #10
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Quote:
Originally Posted by Korrah View Post
Fair enough, but its 7-25V actually
I was speaking of the supply required by using the ADuM4160 in general because it only transfers data to/from the host, not power.
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