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September 18, 2020, 10:42:41 PM

Author Topic: Noise with Computers, USB DACs, and Powerline Ethernet Kits  (Read 5251 times)

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Offline Paul Birkeland

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For those who can hear their computer working away through their Crack or who are using a powerline ethernet kit and hear lots of clicking and static, a ground breaker installed in place of the buss wire between the chassis and the ground tab of the IEC power entry module will very likely solve this issue.  I recommend using a diode that's rated for at least 2A, and the voltage isn't particularly important.  Part number STTH2R06 looks to be a solid choice.  I do not recommend using a Schottky diode here. 

I've attached a photo of how this is retrofitted into a Crack. 
Paul "PB" Birkeland

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Offline denti alligator

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Re: Noise with Computers, USB DACs, and Powerline Ethernet Kits
« Reply #1 on: June 22, 2019, 03:11:12 AM »
Would this work on any of the other kits? I have a S.E.X. that has this issue. I use an ifi USB filter that works, but it would be nice to bypass that.
- Sam

Rega P3-24 (w/AT 150MLX) w/Groovetracer upgrades / C4S Seduction / FLAC -->J.River -->DSD256 -->Gustard X20 / Stereomour II / Klipsch Forte II w/Crites upgrades / C4S S.E.X. 2.0 +Nickel MQ Iron / Speedball Crack / Sennheiser HD600 w/Cardas cable

Wish list: Eros / Crackatwo / Tode

Offline Deke609

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Re: Noise with Computers, USB DACs, and Powerline Ethernet Kits
« Reply #2 on: June 22, 2019, 05:02:51 AM »
This is very cool.


@PB: can you explain how it works?


It doesn't make sense to me. Two ideal diodes paralleled with reversed polarities would do nothing, right?  All current/voltage would pass unimpeded in either direction. So I figure it must work ONLY BECAUSE real world diodes are non-ideal.


I've seen ground loop breakers that employ a diode bridge with a resistor and cap to greatly reduce ground loops - but you're using only the diode bridge. Does the tiny amount of resistance and capacitance of the diodes do the trick?  Or is something else at work here?


many thanks,


Derek
« Last Edit: June 22, 2019, 06:06:02 AM by Deke609 »
Derek
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Roon Intel NUC ->  Yggdrasil DAC -> BeePre (w/ BeeQuiet and EML 300B)  -> Kaiju (w/ DCFil and EML 300B) or Stereomour II (2A3 [EML Mesh] and 45 Conversion [EML 45B])  -> Audeze LCD4

Offline Paul Birkeland

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Re: Noise with Computers, USB DACs, and Powerline Ethernet Kits
« Reply #3 on: June 22, 2019, 06:02:00 AM »
Would this work on any of the other kits? I have a S.E.X. that has this issue. I use an ifi USB filter that works, but it would be nice to bypass that.
Give it a shot and let us know!


@PB: can you explain how it works?
It separates the safety ground by the voltage drop of one diode (in either direction).

All current/voltage would pass unimpeded in either direction. So I figure it must work ONLY BECAUSE real world diodes are non-ideal.
Yes, a perfect diode wouldn't allow this arrangement to work.
Paul "PB" Birkeland

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Offline Deke609

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Re: Noise with Computers, USB DACs, and Powerline Ethernet Kits
« Reply #4 on: June 22, 2019, 06:09:43 AM »
Many thanks PB.
Derek
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Roon Intel NUC ->  Yggdrasil DAC -> BeePre (w/ BeeQuiet and EML 300B)  -> Kaiju (w/ DCFil and EML 300B) or Stereomour II (2A3 [EML Mesh] and 45 Conversion [EML 45B])  -> Audeze LCD4

Offline Paul Birkeland

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Re: Noise with Computers, USB DACs, and Powerline Ethernet Kits
« Reply #5 on: June 22, 2019, 06:58:33 AM »
A little more specifically, if you have a small AC voltage, say 100mV, the diodes present a pretty large impedance and this is what's broken.  If you have more than about 0.7V of anything AC or DC, then the diodes will start to short that out.
Paul "PB" Birkeland

Bottlehead Grunt & The Repro Man

Offline Deke609

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Re: Noise with Computers, USB DACs, and Powerline Ethernet Kits
« Reply #6 on: July 25, 2019, 04:40:40 PM »
I do not recommend using a Schottky diode here. 


@PB: why not a Schottky?


Many thanks, Derek
Derek
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Roon Intel NUC ->  Yggdrasil DAC -> BeePre (w/ BeeQuiet and EML 300B)  -> Kaiju (w/ DCFil and EML 300B) or Stereomour II (2A3 [EML Mesh] and 45 Conversion [EML 45B])  -> Audeze LCD4

Offline cddc

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Re: Noise with Computers, USB DACs, and Powerline Ethernet Kits
« Reply #7 on: July 25, 2019, 04:56:10 PM »
My Crack w/SB is dead silent, but marked in case come across some noisy tubes.

Offline Paul Birkeland

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Re: Noise with Computers, USB DACs, and Powerline Ethernet Kits
« Reply #8 on: July 25, 2019, 05:54:53 PM »

@PB: why not a Schottky?


You want the forward voltage drop to be significantly higher than the magnitude of the noise you're dealing with.  The low forward voltage drop of a Schottky diode in this instance is a bit of a disadvantage.
Paul "PB" Birkeland

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Offline Deke609

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Re: Noise with Computers, USB DACs, and Powerline Ethernet Kits
« Reply #9 on: July 25, 2019, 06:10:34 PM »
Ah, yes. That makes sense. Thanks.
Derek
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Roon Intel NUC ->  Yggdrasil DAC -> BeePre (w/ BeeQuiet and EML 300B)  -> Kaiju (w/ DCFil and EML 300B) or Stereomour II (2A3 [EML Mesh] and 45 Conversion [EML 45B])  -> Audeze LCD4

Offline oguinn

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Re: Noise with Computers, USB DACs, and Powerline Ethernet Kits
« Reply #10 on: August 11, 2019, 09:29:38 AM »
I’m thinking about giving this a shot. Is there any amp in the lineup where this would be unsafe or a bad idea? I assume not but don’t want to make a costly mistake.
Jameson O’Guinn

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Main System: Schiit Bifrost MB, Schiit Sol, Eros 2, BeePre, Kaiju/Stereomour II, Jägers, Mainline

Desktop System: Crack with Speedball

Offline Paul Birkeland

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Re: Noise with Computers, USB DACs, and Powerline Ethernet Kits
« Reply #11 on: August 11, 2019, 09:45:45 AM »
I don't see issues doing this with any of our products.  I do also plan to test whether a UF4007 can throw a 20A breaker and survive, as this could also be a suitable part to use.
Paul "PB" Birkeland

Bottlehead Grunt & The Repro Man

Offline oguinn

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Re: Noise with Computers, USB DACs, and Powerline Ethernet Kits
« Reply #12 on: August 11, 2019, 09:56:24 AM »
I picked up a dozen or so and will probably add them to every kit next time any of them are on the bench for one reason or another.

Any downsides to doing it besides the minimal effort and cost?
Jameson O’Guinn

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Main System: Schiit Bifrost MB, Schiit Sol, Eros 2, BeePre, Kaiju/Stereomour II, Jägers, Mainline

Desktop System: Crack with Speedball

Offline Paul Birkeland

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Re: Noise with Computers, USB DACs, and Powerline Ethernet Kits
« Reply #13 on: August 11, 2019, 10:47:24 AM »
In the event of a catastrophic failure, you may need to check and replace the diodes.
Paul "PB" Birkeland

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Offline oguinn

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Re: Noise with Computers, USB DACs, and Powerline Ethernet Kits
« Reply #14 on: August 11, 2019, 12:29:14 PM »
Ok, I’ll just shoot for no catastrophic failures then ;)
Jameson O’Guinn

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Main System: Schiit Bifrost MB, Schiit Sol, Eros 2, BeePre, Kaiju/Stereomour II, Jägers, Mainline

Desktop System: Crack with Speedball