[Mariusz]

+2

Since my box is all wood. I was thinking of using copper or aluminum for interior walls. Solving shielding and grounding issues.

Lowe's got thin sheets in rolls (roofing supplies) but it is like $40 per roll and lots of it.

Anybody got different source ???


Mariusz   

[jtwrace]

Use an aluminum case.   

[dewardh]

Use an aluminum case.   

Ya think maybe?  Or stamped steel with lots of vent area for better cooling? 

Easy enough to mount a wood "dress panel" to hide the sordid reality.  I suppose copper screen or a "bird cage" of 1/4 inch hardware cloth (with mounting plates for input and output connectors) would also work . . .

[jtwrace]

Ya think maybe?  Or stamped steel with lots of vent area for better cooling? 

Easy enough to mount a wood "dress panel" to hide the sordid reality.  I suppose copper screen or a "bird cage" of 1/4 inch hardware cloth (with mounting plates for input and output connectors) would also work . . .

Well, being that I'm making aluminum cases for these, yes, I'd say aluminum.  Mine will have vents in the top rear for cooling.   

There are many ways to "skin the cat" though.

[srb]

Well, being that I'm making aluminum cases for these, yes, I'd say aluminum. Mine will have vents in the top rear for cooling. 

Could the top rear vents be accompanied by bottom or side intake vents so that there is some kind of convection "air flow"?
 
Steve

[jtwrace]

Could the top rear vents be accompanied by bottom or side intake vents so that there is some kind of convection "air flow"?
 
Steve

It will not have side vents...Tom said the way I have it, is perfect for venting.  Also, there are holes on the bottom so you will get airflow.

 

[srb]

It will not have side vents...Tom said the way I have it, is perfect for venting. Also, there are holes on the bottom so you will get airflow.

Do you have any preliminary information on dimensions (to determine what size (and height) of power supply caps might fit) or ballpark pricing?
 
Steve

[Robert F.]

+2

Since my box is all wood. I was thinking of using copper or aluminum for interior walls. Solving shielding and grounding issues.

Lowe's got thin sheets in rolls (roofing supplies) but it is like $40 per roll and lots of it.

Anybody got different source ???


Mariusz

Check the heating duct isle at Lowe's. I bought some duct steel a few years back and it did not cost much. You just have to pound and bend it flat as it came rolled up. I am glad you brought this up because I need to go to Lowe's and check this out for myself.

Robert

[jtwrace]

Do you have any preliminary information on dimensions (to determine what size (and height) of power supply caps might fit) or ballpark pricing?
 
Steve

External dimensions will be ~13.25" wide x ~16.25" deep.  Internal height will be ~3.4"

I don't want to discuss pricing out of respect to AC.  You're more then welcome to contact me via PM or email.

[mintzar]

Just wanted to update and let you guys know that replacing the R9 and R11 SMD resistors and lowering the gain DID remove the hiss I was getting in my tweeter as expected.

[wushuliu]

Well I couldn't help myself; after all that power supply talk I went and ordered some 6800uf Panasonic TS-HA caps to replace the 3300's that came w/ my 250w amp. Replacing was easier than I expected, as the holes are bigger and I'm getting a handle on working with the solder Tom uses ( needs a good hot iron).

What am I hearing? what I'm hearing is some bass slam. Music's got some kick to it. Low end is a thumbs up. Didn't know my Modula MTMs could go so low with a punch despite the relatively small enclosure (see my gallery pic). I think the midrange is also more forward, or more present. It's a much livelier amp. Maybe that's dynamics, I dunno, I get tired of trying to find the right lingo. It sounds a damn lot better that's for sure.

I've only been listening for a few hours but I am way impressed.
 

[Nick77]

Wushuliu is the mod as simple as just replacing the caps, no other changes to the board ie rectifier or such ??

[Niteshade]

You can order a kit which contains larger capacitors: http://classdaudio.com/index.php/class-d-amplifier-kits/home-kits/250w-x2-500w-x1-amp-large-power-supply-transformer.html

Note:
To save some $$$$: Old stereo receiver transformers can be used if they produce anything between 80 to 60 volts with a center tap. The capacitors and rectifiers can be salvaged as well as long as they're good. (I wouldn't bother with the rectifier unless it was a bridge module.)

[pumpkinman]

I still have to make a top for it

[shadowlight]

Wow Bill, that case is going to look great.  Did you make the rest of the case out of metal?

[Niteshade]

"What would you like to hear, Dave?"

Building one of these amps inside a computer would be a fascinating project! Not only that- but the ventilation would be perfect. You would have to use a full tower case. Ahh...one with a clear side! 

[pumpkinman]

Wow Bill, that case is going to look great.  Did you make the rest of the case out of metal?

I started out with the metal box made locally and applied poplar panels
all straight cuts then used brackets to secure them to the box. This way
there are no glue joints, this could be with made a 3/8'' plywood box
then cover it in the same way making it simple and resonable. The top
will have a 4" hole with screening installed for heat and I will use small
magnets for the top to make it easier to access  the inside.................Bill

[nodiak]

mintzar, good to know. What resistors did you use?
Don

[mintzar]

I used 10k 1/4w 1206 Vishay/Dale resistors.

[pumpkinman]

I've had a great time putting this all together from the NAD case to the one I'm presently working on. So now I would personally like to Thank Steve K for starting this post !!