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Buzzing sound from power conditioner
Buzzing sound from power conditioner
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Old 17th September 2021, 12:27 PM   #41
NareshBrd is offline NareshBrd  India
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It may be buzzing due to load.
Disconnect the load, and check.
The thermal relay, if there is one inside, can also be a noise source.
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Old 17th September 2021, 02:48 PM   #42
mwilson is offline mwilson  United States
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Thanks. I'm back on the road and will try these when I return, late next week. Wishing you all a great weekend, and thank you once again for all the help!
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Old 17th September 2021, 04:23 PM   #43
seppstefano is offline seppstefano  Italy
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Quote:
Originally Posted by jean-paul View Post
...... just when I thought my German made brand new isolation medical transformer was expensive with 75 Euro
A couple of days ago I received a small carton with three small isolation medical transformers from Sedlbauer AG for my ever-going mains unit project. Just curious to know whether we selected the same brand?
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Old 17th September 2021, 04:45 PM   #44
jean-paul is offline jean-paul  Netherlands
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Mine is a Noratel IMED150. A ready made certified medical device in casing so with switch, fuse etc. Left over from project.
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Last edited by jean-paul; 17th September 2021 at 04:59 PM.
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Old 17th September 2021, 04:56 PM   #45
seppstefano is offline seppstefano  Italy
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Thanks for sharing, mine is Ringkerntrafo Transformator 300VA 2x115V 2x115V 230V Sedlbauer RTO-825054
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Old 17th September 2021, 05:28 PM   #46
jean-paul is offline jean-paul  Netherlands
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62 euro is not bad. An isolation transformer ia a very good upgrade for audio sources. IMO it is an obstacle but when I take it out of the chain the result is less good. Using it makes more of a difference than using mains filters. I use both.
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Last edited by jean-paul; 17th September 2021 at 05:31 PM.
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Old 18th September 2021, 09:39 AM   #47
seppstefano is offline seppstefano  Italy
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Absolutely, years ago I used one for all digital-related sources (including my separate DAC), another one for analog (preamp, tuner). Power amp went (and goes) directly to mains, through a parallel line filter.

Now I'm going to further separate DAC from devices operating only at digital level (yes I still happen to have a CD spinner ).

So, that's why three small trafos, way oversized for the VA declared requirements. Less load and hopefully less mutual interference.

And you can wire to have balanced mains feeding your unit.
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Old 5th November 2021, 07:26 AM   #48
jean-paul is offline jean-paul  Netherlands
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Quote:
Originally Posted by seppstefano View Post
Got hold of Imed 1000's for 100 a piece. With electronic soft start, test button etc. I also could have the 2000 but these hum extremely.
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Old 5th November 2021, 09:37 AM   #49
seppstefano is offline seppstefano  Italy
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It seems you found a really good deal!

I installed two out of the three trafo I bought for my diy unit and so far I'm glad they're dead silent and the increased mains separation improved the pleasure of listening
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Old 5th November 2021, 10:24 AM   #50
jean-paul is offline jean-paul  Netherlands
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Will try the Imed1000 this weekend. It hums slightly mechanically (as usual with 1000 kVA...) but apart from that it is a ready built medical device so everything is well designed. These are custom built in a larger 19" casing for a certain brand medical gear. What surprised me is the very loud humming of the 2000 version. That one is absolutely unusable for audio when placed in the same room.
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Last edited by jean-paul; 5th November 2021 at 10:29 AM.
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