How noisy is your outlet?

lanchile · 20th February 2012, 06:05 PM

it is unbelievable how noisy are the outlets. I did a test in my outlets and they are "ALL" noisy. after using an ac filter from Monster power, almost all the RF noise went away.Too bad most of us just pay attention just to our amp projects and not to the AC source. here is my toy.

GloBug · 20th February 2012, 06:12 PM

Neat device, I assume all outlets have a little noise.

My personal view is the amp ends at the power cord. I am not interested in a device that needs filtering before the plug.

I want my amp(s) to sound good wherever they are plugged in.

How much of that noise do you think gets through a well designed power supply?, or are you implying the noise is getting in through the ground?

pdul · 20th February 2012, 06:23 PM

I have 1840 watts of pure 50HZ noise on my outlet

sbrads · 20th February 2012, 06:33 PM

Ground is ground to 50/60Hz, but it isn't at RF with typical domestic wiring. Nowhere near it so I don't think it can be relied on for anything other than safety issues.

Speedskater · 20th February 2012, 07:16 PM

Much of the higher frequency noise can be coming from the SMPS's and digital components in your hi-fi system.
Your equipment's power, interconnect & speaker cables all act as RFI antennas. Good circuit design should stop the RFI at it's entrance points.

DF96 · 20th February 2012, 07:25 PM

Ground is almost meaningless for RF anyway. A ground wire acts as an antenna. We might do better to think more in terms of equipotential rather than ground, but even that is a slippery concept when RF is about.

lanchile · 20th February 2012, 10:47 PM

Quote:

Originally Posted by Speedskater

Much of the higher frequency noise can be coming from the SMPS's and digital components in your hi-fi system.
Your equipment's power, interconnect & speaker cables all act as RFI antennas. Good circuit design should stop the RFI at it's entrance points.

I measured all outlets making sure "NOTHING" was plug into "ALL" outlets in whole apt, not even a lamp. and there were some that were worse than others. for example in my kitchen there was one that I could listened to a radio station clearly. there were some with just loud static noise.
yes, some good circuit can stop RFI.

mlloyd1 · 21st February 2012, 12:23 AM

what does the number mean? Is it a figure of merit?

mlloyd1

Quote:

Originally Posted by lanchile

it is unbelievable how noisy are the outlets. I did a test in my outlets and they are "ALL" noisy. after using an ac filter from Monster power, almost all the RF noise went away.Too bad most of us just pay attention just to our amp projects and not to the AC source. here is my toy.

tvrgeek · 21st February 2012, 12:31 AM

Noise comes right through even traditional e-core linear supplies. I was amazed how much when I went to measure the ringing of my new rectifier. The noise was greater than the rectifier ringing. You need filtering if you are trying for high fidelity. Very few designers take care of inside the box. They should, but that is the way it is.

overtheairbroadcast · 21st February 2012, 12:34 AM

I have to rewire my house it is so noisy as the wires were put in around 1951. I have done a few rooms so far, but still have the living room to do as well as the office, so I think you are all very lucky.

How noisy? I think the Nutech meter up there would shake apart from all the oscillations...

20th February 2012, 07:16 PM	#5
Speedskater diyAudio Member Join Date: Sep 2002 Location: Lakewood, Ohio	Much of the higher frequency noise can be coming from the SMPS's and digital components in your hi-fi system. Your equipment's power, interconnect & speaker cables all act as RFI antennas. Good circuit design should stop the RFI at it's entrance points. __________________ Kevin

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20th February 2012, 06:12 PM	#2
GloBug Banned Join Date: Jun 2011	Neat device, I assume all outlets have a little noise. My personal view is the amp ends at the power cord. I am not interested in a device that needs filtering before the plug. I want my amp(s) to sound good wherever they are plugged in. How much of that noise do you think gets through a well designed power supply?, or are you implying the noise is getting in through the ground?

20th February 2012, 06:23 PM	#3
pdul diyAudio Member Join Date: Jan 2009 Location: Copenhagen	I have 1840 watts of pure 50HZ noise on my outlet

20th February 2012, 06:33 PM	#4
sbrads diyAudio Member Join Date: Jun 2005 Location: Kent, UK	Ground is ground to 50/60Hz, but it isn't at RF with typical domestic wiring. Nowhere near it so I don't think it can be relied on for anything other than safety issues.

20th February 2012, 07:25 PM	#6
DF96 diyAudio Member Join Date: May 2007	Ground is almost meaningless for RF anyway. A ground wire acts as an antenna. We might do better to think more in terms of equipotential rather than ground, but even that is a slippery concept when RF is about.

21st February 2012, 12:31 AM	#9
tvrgeek diyAudio Member Join Date: Dec 2009 Location: Md	Noise comes right through even traditional e-core linear supplies. I was amazed how much when I went to measure the ringing of my new rectifier. The noise was greater than the rectifier ringing. You need filtering if you are trying for high fidelity. Very few designers take care of inside the box. They should, but that is the way it is.

21st February 2012, 12:34 AM	#10
overtheairbroadcast diyAudio Member Join Date: Jan 2012 Location: Canada	I have to rewire my house it is so noisy as the wires were put in around 1951. I have done a few rooms so far, but still have the living room to do as well as the office, so I think you are all very lucky. How noisy? I think the Nutech meter up there would shake apart from all the oscillations...