Taming Tribbles?

[sandyk]

1 hour ago, davide256 said:

Yea, I think the Schitt Eitr is the only "tribble" on my strip that uses an AC out wallwart . The rest are all DC out wall warts/bricks.

 

 If they are of recent vintage, all of the DC out wall warts are likely to use an internal SMPS.

 Earthing the 0 volts/case of the powered device may improve the SQ from these devices, or reduce their degrading effect on other devices.

There is a thread devoted to this in the Uptone Forum area with E.E. John Swenson offering some very helpful advice and explanations.

 

https://www.computeraudiophile.com/forums/topic/37034-smps-and-grounding/

 

[sandyk]

12 minutes ago, Les Habitants said:

 

+1 on this, I've found this JSGT shunt to be effective in systems where SMPS wall warts are a necessary evil.

The world of Ham Radio also offers a solution for attenuating so-called SMPS "backwash", by Array Solutions. Their AC-7 filter is designed to allow SMPS use in the very noise sensitive/critical front end radio receiver environment without destroying the reception.

 

I am using the attached kit in line with my computer. Due to necessity, I have to use an internal antenna in close proximity to my PC, with a very Low Noise MHA in line for DTV. 

I also added a VDR across the input, mounted under the PCB.

Alex

http://www.ebay.com.au/itm/3900W-EMI-18A-High-Frequency-Power-Filter-Board-DIY-Kits-F-Speaker-Amplifier-/322591319359?hash=item4b1bf0e53f

[sandyk]

7 hours ago, davide256 said:

Appreciate the replies. @sandyk While not all things work, my general experience lately has been that power supplies "leak" things into audio components and  that as the noise floor drops on your active analog components, the "leakage" interferes with further improvement. Will give John Swenson's grounding suggestion a try on the DC wall warts,.  @Les Habitants will try the AC-7 suggestion  also,  just got the Eitr so  need some settle in  time before I  try to compare filtered vs unfiltered.

 David

 Agreed about PSU leakage.

Even a nearby DTV can affect audio. Some poorly designed controllers for LED lighting can also cause problems.

With my DIY Preamp I even switch the "earth" side of it's inputs through as well to help reduce this problem.

Alex