Yes there are, but at ridiculous prices considering the price of the
interface. With regard to the interface. They are all very similar and all
offer the line in/out option some have pick up level switches, the ones with
the earth terminal, some have a digital input again switched, but the
innards are based around the same chipset.
The interesting thing is that the sound is on the output not the input
side Now on another machine we hear the odd crackle coming through the
output side on the same or similar interfaces, again not recorded, so I'm
just wondering if the output analogue amp is slightly more susceptible to
psu noise than the input is. If this is the case then some kind of powered
hub with a decent usb psu, perhaps an analogue one might fix it.
Brian

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"Arthur Quinn" wrote in message
news
On 2017-02-13 16:03:55 +0000, Eiron said:

On 13/02/2017 15:26, Jim Lesurf wrote:
In article om, mick
wrote:
Hi Brian, You don't mention which unit you have, but I'm using a
Behringer UCA202 feeding a home-brew headphone amp. There's no apparent
background noise at all. I'm using a quite good quality lead between
the Behringer and the amp to prevent noise being introduced here. I've
not got any sort of fancy power supply or earthing arrangement.

Brian mentioned his having a ground terminal. The UCA202 I have doesn't
provide one of those. So he may have a variant that includes an RIAA
preamp.

The UFO202 has line/phono input and a ground terminal.

If using a laptop it can help to disconnect the power and do your work on
battery.
And also checking the earthing. One path to earth is better than none or
several.

When I had this problem some while ago between an iMac and a fixed HiFi
system using an M-Audio DAC, I guessed that it was an earth loop problem
and tried transformer coupling the audio. That cured it.

I believe that this whine is a quite common problem and there are readily
available USB isolators that will break the earth connection on the USB
lead.

Arthur

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