we sell the avs2000 at work. its crap. its a HUGE variac. it senses the voltage coming into it, and acts as a variable transformer, converting the voltage back to the 115 or whatever. its SO slow, and noisy. and damn expensive. its $1500. and it still varies like +-3V, which isnt that great.
put it this way, i get that below cost ($600), and i wouldnt buy one 🙂
look at ps audio stuff. pricier, but does what its supposed to do.
put it this way, i get that below cost ($600), and i wouldnt buy one 🙂
look at ps audio stuff. pricier, but does what its supposed to do.
Coulomb said:
Member
Joined 2002
cowanrg said:
Smart Devices calls their device an AC Line Purifier:
http://www.smartdev.com/gc120.html
I looked at the insides of one of them when I was down there, and it looks really simple. It appears to just be a big 2kVA transformer tied to some pre-built rf and emi filters. The pcb that you see inside is for the front meter.
It seems to have gotten decently good reviews.
In my apartment, I have an intermitent problem where my amplifers make a low buzzing noise. It is strong some days and other times it is hard to hear. It gets pretty damn annoying when it is loud. It can tend to be audible when listening to music at reasonable levels. Would building one of these devices solve my problem? My neighbors across the street have the exact same problem with their audio gear. I thought it was my amp and I took it into lab and analyzed it and listened to it and there was no buzz/hum at all.
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Brian
Member
Joined 2002
exactly my point that is why i wnat to buid one
schematic needed please hehe
2kv why 2kva..
mabey for all my audio but if were to add that ip i need a 10kva
2 x av800's 2 x aleph 2's 1 pre amp and all my crossovers and cdplayr WOW lots.
schematic needed please hehe
2kv why 2kva..
mabey for all my audio but if were to add that ip i need a 10kva
2 x av800's 2 x aleph 2's 1 pre amp and all my crossovers and cdplayr WOW lots.
2kVA should keep you covered, and the engineer guy said that they are underrated by quite a bit.
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Brian
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Brian
JasonL said:
Member
Joined 2002
I would also like to build one. The question is, should I use the pre-built EMI/RF filters, like the one pictured above, or is it better to build the out of discrete parts?
The link posted earlier has a line filter schematic:
http://kahuna.sdsu.edu/~tucker/diyaudio/acfilt.html
I am going to search for surplus filters and try them out on my line.
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Brian
The link posted earlier has a line filter schematic:
http://kahuna.sdsu.edu/~tucker/diyaudio/acfilt.html
I am going to search for surplus filters and try them out on my line.
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Brian
BrianGT:
Is this maybe the "toroid buzzing due to undesired DC from, say, a triac-based light dimmer on your or a neighbor's power line" problem? There was a thread on this earlier with a circuit that some claim solved this problem for their application.
mlloyd1
Is this maybe the "toroid buzzing due to undesired DC from, say, a triac-based light dimmer on your or a neighbor's power line" problem? There was a thread on this earlier with a circuit that some claim solved this problem for their application.
mlloyd1
BrianGT said:
It makes the noise with both EI core and toroid transformers. It is actually always there, but just get louder at times. It is definately not the amplifiers, as if I take them outside the house and into a different power source at a friends house, they sound fine.
It is a buzzing, hum, slightly static like sound that is pretty low pitched. I thought I had a ground loop in my amp when I first heard it.
Which thread are you referring to? I missed it.
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Brian
It is a buzzing, hum, slightly static like sound that is pretty low pitched. I thought I had a ground loop in my amp when I first heard it.
Which thread are you referring to? I missed it.
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Brian
the one i have is basically like that. just a HUGE power supply. its quite simple inside, maybe some day ill crack it open again and show everyone what it looks like. it does clean up the sound a bit. i think i may invest in one of the smaller monster power line conditioners in combination with this, so i get clean and stable power.
my alephs have EMI/RF filters built into the IEC's of each though...
my alephs have EMI/RF filters built into the IEC's of each though...
BrianGT said:
Brian,
Sometimes those buzzing noise can be caused by those cheapo upright incandescent lamp (with foot pedal dimmers) that one buys from Home Depot. Did you notice those buzzing noise only at night .... say when the lamp is on - assuming you have it?
Sometimes those buzzing noise can be caused by those cheapo upright incandescent lamp (with foot pedal dimmers) that one buys from Home Depot. Did you notice those buzzing noise only at night .... say when the lamp is on - assuming you have it?
It is not only at night, and sometimes it gets bad during the day and is better at night. It doesn't seem to have a pattern. I will try to get to the surplus electronics store today at lunch and look for some filters.
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Brian
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Brian
I picked up a 20A Corcom Multi-Purpose Power Line RFI Filter For Emission Control and High-Noise Industrial Environments at lunch today from the surplus store. I will see if this helps at all.
Corcom 20VV1:
http://www.cor.com/catalog/filters/vw/default.htm
I also talked to my contact at Smart Devices, and he will ask the engineer if they have any demo models that I can take home and try for a few days next week of the AC Line Purifier.
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Brian
Corcom 20VV1:
http://www.cor.com/catalog/filters/vw/default.htm
An externally hosted image should be here but it was not working when we last tested it.
I also talked to my contact at Smart Devices, and he will ask the engineer if they have any demo models that I can take home and try for a few days next week of the AC Line Purifier.
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Brian
BrianGT, how much did you pay for those?
oh, and Peter Daniel, i wanna buy those from you, but im getting no response 🙂 let me know man.
oh, and Peter Daniel, i wanna buy those from you, but im getting no response 🙂 let me know man.
Cowanrg:
I picked up a 13a one from Brigar:
Brigar Electronics Corcorm filter
It was $5.00
I haven't hooked it all up yet though
I picked up a 13a one from Brigar:
Brigar Electronics Corcorm filter
It was $5.00
I haven't hooked it all up yet though
cowanrg said:
It was expensive, $35, but it sells for around $80 at digikey. I just picked up one, as it should work for testing now. I also found some 100,000uF 60v caps for $20 each.
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Brian
Well.. I tested it with the filter (20VV1 filter) on the ac line going into the amplifier, and the sound got worse.
With the amplifier with no filter and no sources connected, the transformer made a slight buzzing noise, and there is a slight hissing from the tweeter. You can't hear the slight hissing unless you put your ear right up to the tweeter. The transformer buzzing isn't too bad with the case cover on, and is audible only about 3 feet away.
With the filter added in series with the ac line, the buzzing was still there, but it added a nasty static sound to the tweeters.
When I connect my cd player to the amplifier (straight in with no pre-amp, just a 50k pot for volume, I get the buzzing. It is similar to the transformer coming from to speakers. It is quite annoying. The cd player is just a sony scd-ce775, unmodded, and has just a 2 prong cord. I am going to try the filter with this next. It might work better for the cd player.
When using a battery power cd player (sony discman), there was no buzzing at all while using it.
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Brian
With the amplifier with no filter and no sources connected, the transformer made a slight buzzing noise, and there is a slight hissing from the tweeter. You can't hear the slight hissing unless you put your ear right up to the tweeter. The transformer buzzing isn't too bad with the case cover on, and is audible only about 3 feet away.
With the filter added in series with the ac line, the buzzing was still there, but it added a nasty static sound to the tweeters.
When I connect my cd player to the amplifier (straight in with no pre-amp, just a 50k pot for volume, I get the buzzing. It is similar to the transformer coming from to speakers. It is quite annoying. The cd player is just a sony scd-ce775, unmodded, and has just a 2 prong cord. I am going to try the filter with this next. It might work better for the cd player.
When using a battery power cd player (sony discman), there was no buzzing at all while using it.
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Brian
Did you ensure all devices were at the same ground potential? If you picked up the filter surplus, there is a good chance it is defective. Also when using these HF filters, they do have a tendancy to aggravate an existing ground loop problem. I had a similar problem with a brand new corcom VR10A. I found that even though the filter was grounding itself through the chassis, when I connected a ground lead to my star point the wire would get quite hot. Eddy currents were flowing through my ground circuit because of the proximity to my toroidal. I moved my ground plane and ran a seperate ground form the electrical outlet to every chassis in the rack. This dropped the background noise seemingly below the audible level at 0 ft from the speaker.
Since then I have always successfully used Corcom filters (New) and find they improve the details in the media. You must make certain you have quite a bit of surplus capacity with High current draw devices or they will bottle neck the AC supply. I would say 50% as a rule of thumb.
Anthony
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