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#1 2023-02-26 05:43:49

frankyfranky
Member
MacintoshFirefox 78.0

Need help for client shielding PSU of S950

Hello,


I got a client with special needs and  he needs to magnetically shield the psu´s of those. Euro 220 models.

Any help please? Same  with his Ensoniq, his S3200 comes shielded from factory

thank you

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#2 2023-02-27 14:25:09

nkrypth
Administrator
Windows 10Chrome 110.0

Re: Need help for client shielding PSU of S950

What's the concern? Interference with the audio path or some other gear in the studio?

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#3 2023-02-27 14:34:58

frankyfranky
Member
MacintoshFirefox 78.0

Re: Need help for client shielding PSU of S950

nkrypth wrote:

What's the concern? Interference with the audio path or some other gear in the studio?


Nope, severe EHS electrosensibility with juditial sentence since a few years ago. He lives isolated in a protected natural camp with even no mobile signal due to his severe level.

He can´t pass 15-30 nanoteslas ( the unit that measures magnetical camp of psu) and those unshielded reaches way far the top of the measurer 1999.   This is a serious issue, as well with his big collection of vintage $$ synths.  Also he can´t be close to high frequency ( microwaves, or electric camps), his house has been adapted with shielded biocompatible cables, otherwise he could even not be close to a wall plug.

There are two paths that I know , shielding the psu whatever can be do ( per example wrapping with mu-metal alloy designed for it) but the heat might damage or make more unstable some gear. Mu-metal is like aluminnium kitchen  soft fold for sandwiches, not like a 80´s rack metal side of thought.

I have been told about making a "trafo" on the existing psu and that supposedly could shield those. I got no idea about that, never heard about.

The other path is extracting the psu and put them 2-3 meters away, since magnetical radiation do leaves. This might be easy in samplers, but a mess on old synths, even if leaving the original inside to preserve it´s value and making a exterior clone.

Luckily samplers as his S3200 comes shielded from factory and the measure is 1-5 only, not the others.

thank you

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#4 2023-03-03 15:16:31

nkrypth
Administrator
Windows 10Chrome 110.0

Re: Need help for client shielding PSU of S950

Oh, that's serious. I think you will be better off asking this question on a forum like https://www.eevblog.com/forum/ or similar. You could replace the PSU with a modern one which usually is well shielded but AFAIK S950 uses a linear power supply and still needs AC voltage for some of the functions so I guess the best option would be to remove the PSU from the sampler and hide it in the external box for shielding.

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