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Isolation xformer needs to fit specifications I toldspkii wrote: ↑16 Apr 2026, 14:20Hi, I've been using an isolation transformer for a few weeks now, and it's improved, but it's not perfect. There are still times of day when it malfunctions. My house has a two-phase system (phase-phase-ground, no neutral). It's an old house, so I also installed the transformer in my playroom (to create a phase-ground-neutral system), but it still has the usual problems, just a little better. What do you recommend I do in this case? Thanks in advance.amorou wrote: ↑20 Feb 2026, 17:22Please don’t move this thread to the EMI section. The root cause of most people’s input lag discussed here is this issue, and the EMI section gets very little visibility
Edit
Do not take action before reading 2nd post written by ChristophSmaul1337 , I was refering to system earthing type in my country +some eu countries only . I didnt checked other countries.
Still problem is the same solution will vary depending on earthing system your distrubtor uses , and you cant consume/use those hf , or you cant store it , it gotta go to earth or you gotta block via xformer
High frequency fields in neutral wont drain to earth , due to neutral ground bond is high resistance or absent . Also if you try to do bonding somewhere else other than panel vs , you will create a loop and make it worse.
What happens
Neutral carries high-frequency switching noise from other loads
This noise appears as common-mode voltage between line ,neutral and earth
PSU does not see a perfectly stable input reference anymore
Input emi filter capacitors couple this noise into the PSU primary
Some of that energy passes through parasitic capacitance of the transformer
Small high-frequency currents reach the secondary side
DC rails gain wideband ripple and phase noise
Why this creates lag / micro-jitter
Cpu gpu ram and chipset depend on stable clock timing obviously.
Clock generators use PLLs referenced to supply rails
Supply noise => phase noise => clock edge timing variation
Timing variation changes when operations complete
Frame delivery intervals become inconsistent
Input sampling intervals become inconsistent
We get , uneven frametime spacing , micro-stutter without FPS drop , inconsistent input response , unstable motion smoothness
How to fix it
Neutral to ground bond must have low impedance , obviously ground there must have low impedance too.
or
Isolation transformer with low interwinding capacitiy , but this is hard to do and some xformers sold as low cap are not low cap or they got leakage at core vs. , but emi approving labs vs must use them so you can ask them where they buy it and ask them to make one for you. First solution is easier but they will produce same result ( actually xformer will be better but neglibile kinda)
Yeah , what about pros cons
We would have banned EMI discussions altogether because it was flooding the forum with -- more often than not -- ridiculous claims. We decided to leave that one section instead.
I would start by measuring the voltage difference between neutral and ground at the power outlet used by your computer,kirgo1337 wrote: ↑17 Apr 2026, 16:40I live in a private house, and two wires extend from a pole: a live wire and a neutral wire. I'll be redoing the wiring in two weeks. The ground rod has already been delivered and installed, and according to measurements, its resistance is 2-3 ohms.
So how should I ground my house? TN-C, TN-S, TN-C-S, TT or IT ?
Electrical claims raise the complexity bar significantly, and I was skeptical, but leaving some room for them is very important. Industrial and medical fields take this seriously, using industrial-grade equipment, shielded components, and low-impedance peripherals. There is a reason for all of that care, so we should assume that EMI/RFI/noise issues do exist and may be causing side effects in consumer-grade PCs we just don’t know the extent of it yet, especially since many people have already exhausted software-based attempts to even measure it. Having a dedicated space for discussions like this increases the chances of specialists joining and helping us with highly qualified information. In this field, I believe only some hardware developers pay attention to this issue, while most just develop in their offices with industrial-grade electrical installations (they use a lot of power, fire alarms, etc.). What they consider an acceptable tolerance margin may be exactly what bothers thousands of people.
How can you claim that a particular statement is absurd when we're talking about the unknown?
Unfortunately unknown attracts all kind of schizos and it doesn't look nice.Slender wrote: ↑30 Apr 2026, 23:59How can you claim that a particular statement is absurd when we're talking about the unknown?
How exactly can you distinguish between the thoughts of a schizophrenic and the thoughts of a non-schizophrenic when dealing with the unknown?dervu wrote: ↑01 May 2026, 08:56Unfortunately unknown attracts all kind of schizos and it doesn't look nice.Slender wrote: ↑30 Apr 2026, 23:59How can you claim that a particular statement is absurd when we're talking about the unknown?