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PostPosted: Tue Jan 10, 2006 12:13 am 
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Hen

Joined: Tue Nov 29, 2005 8:35 pm
Posts: 5
Location: Texas
It's an A1.2 BrianD helped me build it. Couldn't have done it without him.

c


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PostPosted: Thu May 11, 2006 1:43 pm 
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Hen

Joined: Wed May 10, 2006 6:45 pm
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Location: Dallas, TX
Man, you guys make some OUTSTANDING enclosures, and should be proud. Once I actually build some amps (soon), I am going to need some assistance - and may come calling. Thanks for sharing!!

Chris


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PostPosted: Thu May 11, 2006 1:57 pm 
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Hen

Joined: Wed May 10, 2006 6:45 pm
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Location: Dallas, TX
OK, thinking out loud alert...

For enclosures, I hearken back to the days were the faux wood enclosures were all the rage, circa 1960's - 1970's. My question is this - a lot of time is spent trying to get metal enclosures fabricated for everything, and it's not something everyone can do without proper tools. Aside from the positive aspects of metal strength, ability to ground, and heat resistance, is there any reason one couldn't build a WOOD enclosure in which to house their amps? Is it a question of "flammability"? Certainly, heatsinks could still be mounted inside the cabinet safely. Thoughts? Comments?

Chris


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PostPosted: Thu May 11, 2006 2:57 pm 
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Sheep

Joined: Sun May 07, 2006 6:48 pm
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Heatsink inside casket have reason in safety regulations, Chris : If you give machine to UL institute, they will measure temperature of every parts at all surface ( every places by finger's touchable ). Temperature past loading cycle mustn't be higher than 60?C, while temperature inside casket isn't so interesting for them. 'Cos modern silicone devices can work by higher temperature, manufacturer take it into account and heatsink give inside...


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PostPosted: Thu May 11, 2006 6:28 pm 
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Cow
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Joined: Sun Dec 19, 2004 1:18 pm
Posts: 265
Location: retired
May I add something about UL specs:

1) The amp output power is 1/8 from max output at sine wave (no clipping observed)
2) The input signal - IEC noise (pink noise with hf filtering)
3) Wait for steady state conditions 3-4 hours
4) The highest temperature rise (hotspot above heatsink) should be less than 40C above ambient

It is really hard to pass this spec


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PostPosted: Thu May 11, 2006 8:12 pm 
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Cow
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Joined: Sun Dec 19, 2004 10:56 pm
Posts: 255
Location: Viborg
dimitri wrote:

It is really hard to pass this spec



Well, actually I'd say that for a diy'er it should not cause any major problems to achieve this. It's basicly just a matter of adequate heatsinking and reasonable airflow.

For a serial production power amp, cost turns into a major issue.

Magura :-)


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PostPosted: Fri May 12, 2006 7:58 am 
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Sheep

Joined: Sun May 07, 2006 6:48 pm
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To dimitri : ... 40°C above ambient, but not higher than 60°C... :cool2:


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PostPosted: Fri May 12, 2006 10:30 am 
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Cow
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Which reduction of UL60065 are you cited? Or it is your own interpretetion?

Table 3 DC DE DU – Permissible temperature rise (a) of parts of the apparatus
...
Enclosures if – metallic (b) 40
...
(a) For tropical climates, permissible temperature rises of 10 K less than those specified in this table are required. The values of the temperature rises are based on a maximum ambient temperature of 35°C for moderate climates and of 45°C for tropical climates.
(b) For parts not likely to be touched during intended use, temperature rises up to 65 K are allowed under normal operating conditions.


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 Post subject: Re: Enclosures/cases
PostPosted: Mon Mar 03, 2008 11:07 pm 
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Cow
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Joined: Mon Jan 03, 2005 6:06 pm
Posts: 428
Location: netherlands
Hi,

My preamp is ready :amen: and i want to share some pictures. Not so much crafting from my side (i did not do much myself on the enclosure), but i eh designed it :grin:

The interiour was shown before and there's some info on my webpage (where is the button ??? Mods? :scratch: ). It is based on a kit from audio & techniek, who did a famous magazine some years ago. Now they are just selling kits as hawk audio.

The controller pcb with volume control, switching etc is my own development.

Greetings,
Guido


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Last edited by guido on Mon Mar 03, 2008 11:14 pm, edited 1 time in total.

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 Post subject: Re: Enclosures/cases
PostPosted: Mon Mar 03, 2008 11:10 pm 
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Cow
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Joined: Mon Jan 03, 2005 6:06 pm
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Location: netherlands
Countdown...


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 Post subject: Re: Enclosures/cases
PostPosted: Mon Mar 03, 2008 11:20 pm 
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Cow
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Location: netherlands
Last one from the inside. Front and top panel are from shaeffer in germany. You can download a small program from their website, which allows you to draw what you would like to get. And it's easy to use. Not cheap though, but i wanted it finished.

The rest of the casing was made at a local school long ago, as a student assignment to some poor chap.


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 Post subject: Re: Enclosures/cases
PostPosted: Wed Mar 05, 2008 2:02 pm 
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Dog
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Joined: Tue Dec 14, 2004 12:26 pm
Posts: 4981
Location: Lisbon, Portugal
Very nice, Guido.
P11?

About the webpage button, you just need to edit your profile and fill the field "Website:" with a valid web address.

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Carlos Filipe

"Any intelligent fool can make things bigger, more complex, and more violent. It takes a touch of genius - and a lot of courage - to move in the opposite direction." Albert Einstein


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 Post subject: Re: Enclosures/cases
PostPosted: Wed Mar 05, 2008 10:32 pm 
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Cow
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Joined: Mon Jan 03, 2005 6:06 pm
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Location: netherlands
P11 indeed, just the name/number of the kit. They now sell a P12: http://www.audio.nl/p12.htm

Must be in bussiness for a while to get to 12 :D

I have a valid address in my profile, but i just does not work :confused:

Guido


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 Post subject: Re: Enclosures/cases
PostPosted: Wed Mar 05, 2008 11:12 pm 
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Dog
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Location: Lisbon, Portugal
guido wrote:
I have a valid address in my profile, but i just does not work :confused:


Ops... you are right, I have just tested and it doesn't work.
Something with the software... we will take a look at that.

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Carlos Filipe

"Any intelligent fool can make things bigger, more complex, and more violent. It takes a touch of genius - and a lot of courage - to move in the opposite direction." Albert Einstein


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