USB DAC input filter
- Thread starter Nikitas
- Start date
Depending on what DAC you are using you could try one of these:
http://hifimediy.com/usb-isolator
http://hifimediy.com/usb-isolator
DARN! That's exactly what i was dreaming about last night!
I had no clue it's already done.....fffffffffffffffff
I had no clue it's already done.....fffffffffffffffff
You're welcome but take a look at this (i did' try it): The Complete USB 2.0 EMI & ESD Solution
Both yes and no, you need at least the ground.
D+ D- is differential. However they cannot be left floating, otherwise when the voltage of both D+ and D- rise too far from the load's ground it will not work.
And a lot of noise comes from having the ground connected.
That is where the isolator comes in handy. Or get SPDIF.
The issue with isolators - transformer or electronic or otherwise - is that they tend to have an upper limit on supported signal frequencies, unless you're willing to pay lots.
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There is also this if you want a ferrite: https://www.radioshack.com/products...-toroid-choke-core-2-pack?&variant=5717359237
As you see it can do a ton of loops.
As you see it can do a ton of loops.
The problem with most of the available isolators is they don't actually isolate the computer noise, the Jitterbug being a perfect example. most noise from the computer is high frequency (I would like to see some figures of how much noise is getting down the USB) the Jitterbug is not laid out with any consideration to this noise and the coupling mechanisms of the noise, so its useless as I believe measurement's on the WEB (and from stereophile I believe) have shown.
I second a ferrite it will do as much if not more than some of the dubious offering....
I second a ferrite it will do as much if not more than some of the dubious offering....
Boky, thank you!
Marce, thanks for joining! I was actually looking forward to your reply
because in another forum I read a reply of yours (I think computer audiophile)
and it was very interesting.
Could you maybe offer your opinion on the below post:
"ok, I'm having trouble understanding something:
I aim for a (third order?) filter for the data lines, common mode type.
What frequency(ies) do I target? should it be high pass or band pass?"
I can't find a source clearly stating which is the bandwidth of data transmitted/received.
Have you tried something like that? Do you think it would offer a better result comparing
to ferrites?
Marce, thanks for joining! I was actually looking forward to your reply
because in another forum I read a reply of yours (I think computer audiophile)
and it was very interesting.
Could you maybe offer your opinion on the below post:
"ok, I'm having trouble understanding something:
I aim for a (third order?) filter for the data lines, common mode type.
What frequency(ies) do I target? should it be high pass or band pass?"
I can't find a source clearly stating which is the bandwidth of data transmitted/received.
Have you tried something like that? Do you think it would offer a better result comparing
to ferrites?
A bit more relevant info on this thread I believe...
http://www.diyaudio.com/forums/pc-based/278547-quick-audioquest-jitterbug-review.html
Also there is another thread with a fully DIY designed isolator.
My mind is rather dulled at the moment, its been a long day at work so I shall return tomorrow, hopefully with a working brain
http://www.diyaudio.com/forums/pc-based/278547-quick-audioquest-jitterbug-review.html
Also there is another thread with a fully DIY designed isolator.
My mind is rather dulled at the moment, its been a long day at work so I shall return tomorrow, hopefully with a working brain
Hello marce, care to take a gander at this? Pi filter on the supply rail, common mode choke on data and an L connecting separate grounds.
USB EMI Noise Suppressor Filter USB Signal Purifier for USB DAC Audio Device | eBay
USB EMI Noise Suppressor Filter USB Signal Purifier for USB DAC Audio Device | eBay