Linear power supply for NAS, Switch or Router on your streaming system

No, but I think you might find using an inline RF noise decoupler or filter on your Ethernet patch lead connecting to your network player a far more effective way of removing all common mode noise rather than just trying to remove the noise injected by the switched mode powersupplies on devices attached to your LAN.

Simon

Marcobb,

I cant answer your specific question.  However, I have noted that having a switched mode supply plugged into circuit used by the hifi can have detrimental effect on other hifi components (sharing same circuit).  FWIW

Charlie

Oops darn touch screen.....

Hi Simon, what is an "inline RF noise decoupler or filter". Are you talking about a ferrite core to wrap around the ethernet cable or something else???

Speaking of in-line ferrite cores, does anyone have any experience with the MIT Zcord II?  It looks like a 15 amp power cord with ferrite cores.

naimUnT,

Many have observed this, I believe.  Many devices come with inexpensive "switch mode" power supplies, often as wall warts but sometimes built in.   In my case it was the stock wall wart for a squeezebox 3, which I later upgraded to a more robust linear supply (with transformer).  This was a few years ago, and the details are fuzzy.  I recall there was a small but worthwhile improvement in the sound of the system (using linear supply) when the smaller switched supply was removed (as opposed to left plugged into wall).  

This is one of those "spooky" issues where a device puts noise on the AC power line (mains) and it adds to the noise floor of some hifi components.  Many variables are involved.  Perhaps someone on the forum, more knowledgable than I, will comment.

If you have concerns, do a little experimenting.  I recall a post long ago (might have been from Julian Verecker) about a comparison between Naim and Linn CD players - the Naim player sounded its best when the Linn was unplugged from the wall.  

I only mention this as something to be aware of when making comparisons or system tuning.  What a hobby, this....

Charlie

linn use SMPs in all their gear. they have filters and screening ,exsecuted well they are excellent . linn cdp were not big sellers but if you take to dealers they sell  very well

Hi Foxman, common mode noise can be handled by ferrite rings or clamps if mild enough. There are other more specialist noise decouplers such as

http://www.djmelectronics.com/...-emi-rfi-filter.html

Can't say I have tried this - but in eseence it converts the UTP signals into fibre delivery and and then back to UTP thereby removing any inherent electrical noise within the signal.

I stick with the common mode ferrite filters that seem to work well with me.

As fas SMPS noise on the mains - I guess to some extent its the the load as well that determines the noise induced, I can hear a slight deadening in the vibrancy of my audio system when my Plasma TV is on which not only produces RFI on the mains from its multiple SMPSs but quite an EMI gradient eminating from the screen.

Also regrettably some cheap imported far eastern powersupplies although have CE type certification markings on closer inspection have had filter components removed at construction - no doubt for cost saving. I umderstand these devices are illegal to sell but can only be spotted througth disassembley and therefore are more prevalent that we would like.

Thanks Simon, think ill try a ferrite core and see if i can hear a difference.

Where can I get those ferrite cores?

I supposed somewhere out there, we can buy them in a kit which allows us to clip onto the patch cables towards the end of the RJ45 connector leading into the streamer?

Anyone care to share a know-how on how this can be done?

Hi - there are many sources - here is one example for clip on ferrites. For a really effective solution you can wind the cable in particuar way around a large ferrite ring but that is more 'advanced'.

Look at  these as an example:

http://www.maplin.co.uk/clip-on-ferrites-32799?c=maplin&utm_source=gcs&utm_medium=gcs_search&utm_campaign=N96AB&utm_content=Ferrites

Simon

You can find ferrite cores designed for all sorts of cables -- the round cable used on the power cords as well as the typically flat cable used for Ethernet.  And the cores are sized to fit different diameter cables.  Just measure the diameter of what you want it to fit, and purchase accordingly.