A challenge to the "measurement" camp

andy2 trying to give engineering lessons .... now that is "lols".

Not 100% isolation, but the whole point of an power regenerator is to isolate, and the whole point of a power supply is to isolate the AC from the audio, and if they are each doing their job, then they AC should be totally isolated and the AC power cord for the regenerator should not matter one little bit.

Sounds like it is a pretty crappy power regenerator if an AC cord makes a difference that is audible .... well if it truly is.

Some noise may leak through, but some and audible are not the same thing. I don't spend that much on a regenerator for anything audible to pass through.

There is a reason why it's called "power conditioner" and not "power isolation".  If one is capable of reading schematic circuit, then one would understand there is no such thing as "isolation".

But I don't expect Atadavid to understand that.  

I don't think you even know what the term "isolation"means. Technically a transformer with non-connected windings is "isolated".  It is also not called a power conditioner, it is called AC REGENERATOR. At least have some idea about what we are talking about so you don't make yourself look so foolish.  Would you like me to draw you a block diagram for one?

A transformer is not an "isolator".  There is something called "mutual inductance".  Electrical 101.  If you open the secondary coil, the primary coil could go high impedance.

Atadavid, you don't know electrical engineering.  Basically transformer like that should be understood by first year student.

You really don't understand this concept of isolation or even what the noise sources are in an audio system do you?  Other than converting voltages, the primary function of a transformer is ELECTRICAL ISOLATION.  I know, pretty tough concept to understand.


If the primary and secondary of a transformer didn't allow power to transfer across the ISOLATION BARRIER, then you would have a hard time getting your audio equipment to work wouldn't you?  You don't want to isolate frequencies that are necessary to make your equipment to work ... be rather pointless.  But fortunately, most transformers have somewhat limited bandwidth which is good, so they act as pretty good ISOLATORS to harmonics on the AC line, mainly due to leakage inductance which may be parasitic or may be intentional.

Because of the ISOLATION BARRIER, transformers are also very good at ISOLATING the output from common mode noise, i.e. from other noisy items on the AC line, and/or EMI/RF injection. Parasitic capacitance in the transformer will allow some of that to cross the isolation barrier, however that is why better transformers will include electrostatic shields to ISOLATE the primary and secondary winding from parasitic capacitive effects. Depending on the winding construction, they may even have several electrostatic shields.

What's sort of funny is neophytes like you assume AC power cords that are good at passing high frequencies must be best to handle "power peaks", but that is not the case, and even some (many) experienced designers make that mistake in their thinking. Ideally you just want 60Hz (or 50), which gets rectified which implements a modulation function and gives you guess what ... 0Hz = DC, and if you sufficiently filter the incoming AC, you get closer and closer to that, but switch mode supplies in this regard can be much better.

Sorry to be so verbose, but I figured you could use the lesson so you didn't look like someone who just regurgitates things they read on the web.