Audioconverter and noise?

The situation is this: in order to isolate electrically the computer and acoustics acquired audiokonverter SPDIF-RCA (computer connected to it by an optical patchcords). It turned out to untie the background of 50 Hz is gone, but there's a new nuisance. It turns out this audioconverter in the absence of input signal (off comp or just a patch cord is not connected to the input), apparently for reasons of saving energy, something there in his disables and as a consequence the output in the speakers there is noise. The noise is more like "white" and not on the crosstalk of 50 Hz.

Ordered here for such a Converter.

Actually, the question(s). How to get rid of this noise? What to do with the Converter? Can advise to use some other Converter? What?
October 8th 19 at 00:54
1 answer
October 8th 19 at 00:56
Did this problem with the Converter, not the amplifier? Try at operating the Converter to pull out the tulips, if the noise appears, then all the same the amplifier. When a signal of the AGC lifts the level and audible noise. But this disease only purely Chinese products, because of serious devices is long since cured...
No, just the Converter. When pulling the tulips out of the Converter noise in the speakers disappears. Maybe there is a way to consistently apply a zero signal to the input? Just how to implement it if the input is optical? Can you tell me the resource with non-Chinese audiodevice? And then on e-bay I only found this kind of Converter. - felicity.Cormier commented on October 8th 19 at 00:59

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