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 Post subject: wooden enclosure
PostPosted: 23 Feb 2010, 13:20 
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Joined: 17 Jan 2010, 08:10
Posts: 43
Just thought id share with you my design of an enclosure for a K12 amp that i am currently building
its mainly wooden, with a curved copper lid and a metal grate at the back (for ventilation)
ive seen on some threads talk of wood not providing any 'shielding'...could someone explain this to me?
also if there are any obvious flaws with my design i would be grateful to hear about them!

the drawings are done on ProDesktop, and ive also made a model to get the dimensions right!


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 Post subject: Re: wooden enclosure
PostPosted: 27 Feb 2010, 11:32 
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Joined: 28 May 2008, 21:53
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Location: Winnipeg, CANADA
Hi Paul, the wood won't provide protection from stray RFI or EMI. Aluminum tape which is grounded can be use to achieve shielding protection.

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 Post subject: Re: wooden enclosure
PostPosted: 27 Feb 2010, 13:59 
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cool what are RFI or EMI?
would alumium kitchen foil work?
also how would i ground it and make sure i dont short anything with it?

cheers


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 Post subject: Re: wooden enclosure
PostPosted: 01 Mar 2010, 13:46 
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http://en.wikipedia.org/wiki/Electromag ... terference

Foil could work, but it is pretty thin. The foil would be grounded so you will want to watch shorts.

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 Post subject: Re: wooden enclosure
PostPosted: 01 Mar 2010, 17:15 
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cool, how would i ground the foil?


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 Post subject: Re: wooden enclosure
PostPosted: 01 Mar 2010, 23:04 
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Connect the foil to the power ground.
Before you dive into the kit, have you taken time to review high voltage safety?

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 Post subject: Re: wooden enclosure
PostPosted: 02 Mar 2010, 11:54 
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i havent read anything specifically regarding high voltage safety, this is my first build but im not attempting any mods, and sticking religiously to the instructions.
i am not a complete novice to electronics and am consulting my father who is somewhat more experienced than i am.
however, if there are any obvious points to mention regarding safety, or general first-build pointers i would be grateful!

thanks mate


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 Post subject: Re: wooden enclosure
PostPosted: 02 Mar 2010, 13:18 
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Here are some good ones to start with:
http://tubelab.com/Safety.htm
http://tubelab.com/MeterUse.htm
http://tubelab.com/Grounding.htm

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 Post subject: Re: wooden enclosure
PostPosted: 02 Mar 2010, 19:15 
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you mentioned grounding the foil to the power ground...is this the ground of the power transformer? i have located this as one of the wires from the group of 3 that come out of the transformer (as opposed to the other group of 2), do i simply solder a wire from the foil to a point on this wire? also, the case has a copper lid, i have insulated but should i ground that in the same way as the foil?

thankyou for your help, i have read the info and shall be checking every conductive bit for a good ground!


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 Post subject: Re: wooden enclosure
PostPosted: 03 Mar 2010, 20:24 
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The transformer has no ground wire? Typically the chassis is connected to the mains ground. Be sure to have someone experienced with mains connections to check over your work before you plug it in.

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