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Old 17th September 2002, 12:47 PM   #1
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Default Clean AC Power

I read a local audio magazine in which they made an assesment on a "thing" that provide a clean AC supply with adjustable frequency. It work by turning AC supply into DC and turning it back into AC by using sine wave generator. Unfortunately, it is very expensive, something in the range of US$2-3K, for me. Is it possible to built one without costing to much money. Also, does this kind of product will give you a better audio? Any one?
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Old 17th September 2002, 01:01 PM   #2
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Check this one AC Power Regeneration anybody?
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Old 17th September 2002, 01:29 PM   #3
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If you really have problems with unclean power why don't you check the Terminator?

http://www.hificonsult.se/pdf/terminator.pdf
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Old 17th September 2002, 01:31 PM   #4
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Default Getting more Confused

Thank Peter for leading me to the link. However, I stopped reading until the 3rd page, I got so confused . Did you built one in the end or are you satisfied with your UPS? If you did build one, can you send me your design or so? Thank you.
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Old 17th September 2002, 01:42 PM   #5
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Currently I'm using my UPS. DAC sounds better when it's connected there, transport is connected directly to the wall (sounds better this way). The thread gives only idea how such device works, but don't provide specific info, so I decided to use UPS for now.
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Old 17th September 2002, 04:10 PM   #6
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Peter, is your UPS online or offline ? - ie is the battery powered invertor stage running constantly and supplying the load ?.
How clean is the sine wave output ?.

Eric.
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Old 17th September 2002, 04:47 PM   #7
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Old 17th September 2002, 04:57 PM   #8
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Balanced power rules!

Why deliver 120VAC on one Phase when you can deliver 60VAC on two Phase? Noise appears at ground in two equal and opposite phases and sums to zero.

Just like theory behind Balanced inputs and outputs.

Anthony
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Old 17th September 2002, 05:04 PM   #9
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Quote:
Originally posted by mrfeedback
Peter, is your UPS online or offline ? - ie is the battery powered invertor stage running constantly and supplying the load ?.
How clean is the sine wave output ?.

Eric.
Depends on amp. I have a DAC and crossover connected to UPS, transport isn't.

With A75 it sounded better when UPS was running from batteries, with Aleph 5 it's better when UPS runs from wall AC. I guess it has to do with tonal balance of both amps. A75 was more metallic sounding and the setup made it more laid back. With Aleph 5 it's just the opposite.

The sine wave was quite decent, although I didn't investigate scope image too much, how it sounded was more important.

Coulomb,

How you get over generating balanced 60V wave?
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Old 17th September 2002, 05:17 PM   #10
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My experince with UPS, both off and on- line has been very negative - severe dynamic constriction and flatenning of stereo perspectives. My main ups is rated at 1200VA.
Power regeneration can be broken down to individual blocks and depending on one's needs can be quite simple. A high quality sine oscillator is very easy to build with distortion less than 0.01% and very low drift. A high power audio amp could follow and a step-up transformer. I haven't been able to get better than 0.4% distortion in the mains regenerated wave, but then again i haven't really tried hard. A good substitute for the audio amp is a bridged amp with STK modules. Depending on the power requirements one can then add additional paralleled STKs.
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