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Hi,
I am looking for easy way or tool to tell that my power source has noise? Any suggestions?thanks.
Follow Ups:
I honestly can't tell if the system has noise and it probably has as your comments. One thing i know for sure that my listening room has a separate circuit line to my room which only my gears use power source, nothing else. I hope that i can have better source.
Simply wire it to a line cord and plug it in to your audio circuit. It will improve the sound if you have RF noise on the line. Alan Maher has posted this tweak in the past.You can spend a lot more money for slightly better performance.
A dedicated line is good but does not totally isolate your system from RF noise from other appliances in your house. It is still worth the time to experiment by unplugging suspect noise sources.
I look at PS Audio site and i see Ps audio Noise Harvester. Just wondering if it's similar to Hammond 193L choke?
I have a bunch of chokes around - what are the criteria for choosing one for this purpose?
Thanks,
Pete
The Hammond 193L is a 5 Henry inductor, so it will draw about 64 milliamps of reactive current with 120 VAC across it. Some of this will cause heating due to core and resistive losses, but the device should run cool. You may occasionally find one that buzzes due to loose laminations.The device will absorb higher-frequency noise and voltage spikes due to the characteristics of the magnetic core. It will not affect dynamics, as it is wired in parallel with the load.
Be sure the chokes you use have a high voltage rating for the insulation, to withstand surges before the core absorbs them.
What is your suggestion to install the choke? Just lay it around or should it be in closed box?I've ordered Hammond 193L from partsexpress, but it is out of stock now..:) can't wait to try it out those.
By the way, the cord with any guage will do? or it must be a large gauge, let say 10 gauge
thanks.
Putting the choke in a protective enclosure makes sense if it will be exposed to traffic, but then you have to make sure the enclosure does not cause problems. Don't use steel or anything that will vibrate.The current will be small, but I've found in many similar tweaks that 14-gauge wire gives the best sonic results.
Thanks. I will get one and try it out. I hope it does not restrict the current , therefore reduce the dynamic.
If you have appliances that contain switching power supplies and/or computer controls, such as LCD TVs, personal computers, UPS devices serving personal computers, cable or satellite TV converters, digital video recorders (TiVo and the like), microwave ovens, telephone answering machines, portable telephones, high-efficiency furnaces, garage door openers, anything with a remote control on-off function, and just about anything with a fluorescent display, then you very likely have RF noise on your AC power wiring, and you can do things to reduce it.It helps to filter the noise at your audio system. It is even better if you couple this with treatments to keep the noise out of the AC at the noise sources, and to dampen the resonances of the AC wiring itself (such as with Quiet Lines). No one treatment is absolute, so reducing the noise going in makes the output of the filter at the audio system even more quiet.
It is difficult to measure power line noise. That is because the power line voltage is so high in value that it swamps out the noise riding on it. The best way to actually measure power line noise is to make a passive notch filter for 50 or 60 Hz, depending on where you live, with an inductor and a capacitor. Then look at the residual with a scope or a spectrum analyser. This can be done by anyone who is sufficiently motivated and technical, but it is not absolutely necessary. If you can try a power line conditioner, AND it works for you, then you probably needed it. If it doesn't, then maybe your power line is fairly clean.
The last time I measured an AC power line, I found garbage out to RF frequencies, and plenty of stuff below 20KHz as well. It is NOT like the textbook assumption of what a power line should be, you know, a main component (60Hz, let's say), and a few harmonics. There was all kinds of stuff, including garbage from switching supplies and perhaps even power saving light sources. How this gets into your audio system is not easy to predict, but often it does, and it effects the sound of your audio (and video) equipment.
You about certainly have noise.
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