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In Reply to: RE: H/W that separate post for a LAN tweak. posted by Ryelands on February 03, 2017 at 08:47:45
Hi there.
Just to let u know.
I had a look at a rather typical LAN transformer solution from Wuerth Electronics.
The Wurth ethernet jacks do not have just a transformer inside.
They also have a common-mode choke inside!!!
And they also have surge protection inside.
If your isolator also comes with such a common-mode choke,
you'd have another filter in the pipe.
Which would of course attenuate the noise even further.
Follow Ups:
I had a look at a rather typical LAN transformer solution from Wuerth Electronics.
Without details of the "LAN transformer solution" you're referring to, I can't comment. Every switch and MC I've looked at uses a U&T device labelled UTH18205. I can't say what's in it as, despite searching, I haven't managed to find pertinent literature.
if your isolator also comes with such a common-mode choke, you'd have another filter in the pipe.
But you prior said (wrongly) that "these EMU filters just cut the ground/shield" though (rightly) making no mention of common-mode chokes. As the datasheet makes clear, they don't come with chokes. With respect, if you're going to say that "I won't even try one of these devices" but insist on talking about them, you should at least read the pertinent literature.
Look.
First of all:
You tell me, they make a difference.
I buy that. I always do. Pretty much everything makes
a difference.
Perhaps it's a bit difficult to understand.
But I told you from an isolation perspective your isolators
are redundant and waste of money.
At 130€uro these are IMO overpriced anyhow. "Medical" is a term almost as
moneyprinting as the term "audiophile".
2nd question would be -- Why do they make a difference??
Your manufacturer says - they isolate and take care on surge protection.
Good. Potentially two more transformers in the loop.
For sure this can make a difference.
Now I was doing some research for a DIY option over the weekend.
By coincidence I stepped over the Wuerth stuff.
Interestingly I found common-mode chokes attached to the transformer
on their devices.
That doesn't mean though that they all have the same setup.
Anyhow. Now I might be able to build my own "isolator" plus "filter" at < 20Euro.
I just wanted to share this.
Enjoy.
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