Last newbe queston for today, shielding

tvrgeek · 25th December 2009, 08:37 PM

Thought it would be fun to try and do some shielding of the transformers.
Idea is just a steel band around them. Soup can won't fit. Would it need to be connected to chassis? As I have a litle room, also am considering lifting them from the steel chassis with a insulator of about 1/16 inch. Less flux coupling.
Advice appreciated.

Richard Ellis · 27th December 2009, 10:51 PM

Stubbie:
I am in the same boat in that I am using a steel chassis also which I hear is a real No No.... There are concerns of coupling the fields to the chassis with a magnetic chassis.
As I have a rather large chassis I will be spacing Iron all over the place. From what I've read the Biggie for field production is the choke for your choke input PS....as it has a lot of AC across it, producing the most intense fields.
There is the issue of spacing...the more distance you can get the better. 1/16" of "insulator" probably won't fly but a block of acrylic at 1/2" will probably be so very far away as to eliminate any field issues.
Yes the "can" should be at earth ground...the green wire, same as chassis.
Have you thought of Pot & Pans?? Yes all those pretty looking cookware...they make outstanding "pots" for enclosing various size transformers & chokes. They are made mostly of aluminum(Non-magnetic) so take a magnet with you to the Kitchen Dept of your local store.
Granted they are expensive but the choices are wide open.

__________________________________________________ ___________Rick....

EC8010 · 28th December 2009, 08:28 AM

Think of that nonmagnetic "insulating" gap as a resistance (reluctance) that's proportional to the square of its thickness. 1/16" will do just fine to prevent any leakage flux from the ironware coupling into a steel chassis.

tvrgeek · 28th December 2009, 09:43 PM

Thanks. Choke. Funny. The Meng amp cost less than a decent choke. C-R-C powersupply! It's small chassis is also a handycap. Going to do a lot more reading and probably hack it up to play. Cake pans do a nifty chassis make! Another kitchen tip. Polypro cutting boards. I have made all kinds of chassis and even car parts out of them. Cookie sheets are a lot cheaper than sheet aluminum at the hardware store. I found a solid brass door kick-plate for 1/10 what it would have cost as sheet brass.

The fun thing about the Meng is that every part of it can be improved. Not that it is bad, it is not, but it is textbook simplistic. Lot's more more fun. If I bought a VTL, I would just have to plug in and say wow.

25th December 2009, 08:37 PM	#1
tvrgeek diyAudio Member Join Date: Dec 2009 Location: Md	Last newbe queston for today, shielding Thought it would be fun to try and do some shielding of the transformers. Idea is just a steel band around them. Soup can won't fit. Would it need to be connected to chassis? As I have a litle room, also am considering lifting them from the steel chassis with a insulator of about 1/16 inch. Less flux coupling. Advice appreciated.

28th December 2009, 08:28 AM	#3
EC8010 diyAudio Moderator Join Date: Jan 2003 Location: Near London. UK	Think of that nonmagnetic "insulating" gap as a resistance (reluctance) that's proportional to the square of its thickness. 1/16" will do just fine to prevent any leakage flux from the ironware coupling into a steel chassis. __________________ The loudspeaker: The only commercial Hi-Fi item where a disproportionate part of the budget isn't spent on the box. And the one where it would make a difference...

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27th December 2009, 10:51 PM	#2
Richard Ellis diyAudio Member Join Date: Sep 2006 Location: Mar del Plata, a BIG seasonal getaway city, can see the Ocean from our residence.	Stubbie: I am in the same boat in that I am using a steel chassis also which I hear is a real No No.... There are concerns of coupling the fields to the chassis with a magnetic chassis. As I have a rather large chassis I will be spacing Iron all over the place. From what I've read the Biggie for field production is the choke for your choke input PS....as it has a lot of AC across it, producing the most intense fields. There is the issue of spacing...the more distance you can get the better. 1/16" of "insulator" probably won't fly but a block of acrylic at 1/2" will probably be so very far away as to eliminate any field issues. Yes the "can" should be at earth ground...the green wire, same as chassis. Have you thought of Pot & Pans?? Yes all those pretty looking cookware...they make outstanding "pots" for enclosing various size transformers & chokes. They are made mostly of aluminum(Non-magnetic) so take a magnet with you to the Kitchen Dept of your local store. Granted they are expensive but the choices are wide open. __________________________________________________ ___________Rick....

28th December 2009, 09:43 PM	#4
tvrgeek diyAudio Member Join Date: Dec 2009 Location: Md	Thanks. Choke. Funny. The Meng amp cost less than a decent choke. C-R-C powersupply! It's small chassis is also a handycap. Going to do a lot more reading and probably hack it up to play. Cake pans do a nifty chassis make! Another kitchen tip. Polypro cutting boards. I have made all kinds of chassis and even car parts out of them. Cookie sheets are a lot cheaper than sheet aluminum at the hardware store. I found a solid brass door kick-plate for 1/10 what it would have cost as sheet brass. The fun thing about the Meng is that every part of it can be improved. Not that it is bad, it is not, but it is textbook simplistic. Lot's more more fun. If I bought a VTL, I would just have to plug in and say wow.

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