[sdiy] what makes a transformer vibrate?

[jhaible at debitel.net]

If the transformer wasn't undersized from the start, on 220V
mains voltage, it certainly is now, with increased voltage.

I would (and I will, because I have the same problem, as
I posted a few weeks ago) use a stepdown transformer to get
down from the 230V to something lower.

I will try this on a few individual synths that show the problem,
and if it helps, I'll introduce a second power distribution 
line in my studio, which runs on 220V (or 210V even). Modern gear
goes into modern supply, vintage gear goes into vintage supply.
(;->)

JH.


> 
> Quoting Nils Pipenbrinck <np at inverse-entertainment.de>:
> 
> > Is this a problem, and how to get rid of it?
> > 
> > I have a old Nordmende transistor radio from the 60th in my kitchen. 
> > Don't use it much, but yesterday evening I noticed how loud the little 
> > power transformer vibrates. It's the original external mains adapter, 
> > and I don't want to replace it. (it's just a 220V to 12V transformer, a 
> > fuse and 4 rectifier diodes, but the housing and inner life are still 
> > original and look very funky).
> 
> Some causes of transformer hum are undersized core, loose core pieces, and DC
> 
> or noise on the power line. It may just be a low quality transformer.
> Torroidal 
> type transformers are much more sensitive to DC on the power line than other
> 
> types.
> 
> It should not be a problem other than the annoyance from the vibrations, you
> 
> could cure it by replacing the transformer or using a DC filter on the
> mains.
> 
> Take care,
> Doug
> ______________________
> The Electronic Peasant
> 
> www.electronicpeasant.com
> 
> 
> 




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