But 150 mV up to 800 mV is quite! Any component hi-fi component should deal with way more than that.
But you might be able to track down even that small amount of noise.
Does it change with time of day, day of the week, season or which hi-fi components are on?
It's best to attack noise at it's source.
Hi ! yes that is what i am reading. Yes it is changing i think due to some appliance on the circuit waking up i think. It was just a quick first test.
In the weekend i will get a power strip and place all my power cord on it to test one by one and see if they have any effect on the noise.
I will try to look inside the unit and see how the sockets are connected. I hope they are not in series. I think that some kind of re-wiring could be possible. Like star earthing or similar. It will be a testing bench. I like it because it has socket on the front and on the back.
There is a DIY filter called Felix here in the Lab I believe. Found ! thank you very much ! https://www.audiocircle.com/index.php?topic=25757.0
You could measure then insert Felix and measure again.
Or you could borrow a well known PC from a dealer or friend. Same procedure. charles
Hi ! very interesting. Is the Lab a dedicated circle on this site ? this is what i would like to try first. A simple passive DIY filtering solution. It could be quite beneficial. Anyway i would like to make clear that i am quite confused about power supplies in general. Just to give you an example and speaking of digital sources i read often that very clean voltage for clock circuits is mandatory to provide stability and that smps are not the best solution. And then i see master clock generators using smps ... so i get confused a lot. Now i have bought this little and unassuming device and indeed it measures some kind of noise.
So the testing can start. I will try all the power cords i have already at hand and see if they lower this noise. Maybe i will discover a hidden gem ...
Depends on the frequency, too.
Hi ! i understand that without a proper wideband scope the measurements are very limited. And that is indeed my long term idea. To get a proper scope. Unfortunately i have little free time now and also often moving from place to place. But when i will be settled down i want to make this my full time hobby.
With a scope i could see directly the effect of a filter i guess.
Here is ny experience with a noise sniffer. The exception is I was already doing plenty to get rid of the noise.
link to my thread https://www.audiocircle.com/index.php?topic=162162.msg1727059#new
Hi ! thank you very much indeed. I am studying the thread. I am not very educated in electronics. I hope to understand the most.
Thanks to all of you sincerely.
Kind regards, gino