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Old 23rd July 2011, 02:38 PM   #241
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Default Good Meanman, this is very good.

But when we increase board size we have problems to install two big boards inside an enclosure.... this worries me.

Go ahead.

regards,

Carlos
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Old 23rd July 2011, 03:04 PM   #242
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Yes I'm shure it's only 28mm differents not a big deal
That's why I ask people what they want
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Old 23rd July 2011, 03:25 PM   #243
alex mm is offline alex mm  Europe
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Hi Meanman ,
I have adjust to correct size , 265 mm X 115 mm
Alex.
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Old 23rd July 2011, 03:50 PM   #244
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I am not sure about the bigger boards with L-brackets.
As Mr. Carlos said, it means less space to install in a standard enclosure, which will have quite big transformers inside as well. You lose space of the transistors, and of the brackets thickness.
Also, I think the first slimmer version is more versatile if one wants to install the boards vertically, attached directly to the heatsinks, allowing a compact solution.
Not to mention the loss of heat transfer induced by brackets.
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Old 23rd July 2011, 04:06 PM   #245
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It all depends what the people at my groupsbuy wants.When you build a high power amp you don't instal everything in a small case.If they want the smaller boards it's OK by me.Alex can you send me the files of both corrected boards regarding the 390 Ohm resistor?
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Old 23rd July 2011, 06:50 PM   #246
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Quote:
Originally Posted by meanman1964 View Post
It all depends what the people at my groupsbuy wants.When you build a high power amp you don't instal everything in a small case.If they want the smaller boards it's OK by me.
I will make some 3D models of case layouts, and see what comes up
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Old 23rd July 2011, 07:23 PM   #247
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Default 3D models are nice to see how an unit gonna be.

Go ahead.

C'a marche!

regards,

Carlos
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Old 24th July 2011, 02:18 AM   #248
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Here are some some basic 3D layout models to investigate boards dimensions.
I have used a fairly standard Hifi2000 pesante dissipante 3U for the illustration. The reason I chose Hifi2000 is that these have common dimensions, and are widely available, so this makes a good reference. I added PSU caps and transistors for cosmetics.

This first layout features the slim board without the L-brackets. There is room for a 500VA transformer of standard diameter.
Click the image to open in full size.

Next features the large board with L-brackets. Space is considerably reduced. The 500VA transformer does not fit.
Click the image to open in full size.

One solution is to go for dual smaller transformers (around 225VA), which fit very tightly between the boards. But there is very little flexibility on the size of the transformers. For instance, I like to use shielded transformers, which adds to the diameter. Not possible here.

Click the image to open in full size.

Next, let's investigate the vertical mounting. Vertical mounting is managable with the slim board, with a little bending of the leads of the transistors.

Click the image to open in full size.

Large boards will hardly fit in the 3U case. A 4U case will be needed, which will lead to sub-optimal space management.

So, my take on this is that the L-bracket mounting has more disadvantages than advantages in this application.
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Old 24th July 2011, 02:50 AM   #249
a.wayne is offline a.wayne  United States
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Quote:
Originally Posted by alex mm View Post
Hi Meanman ,
I have adjust to correct size , 265 mm X 115 mm
Alex.
Sweeet ...alex ..


Cafe Noir , I dont like the last layout , the vertical mounting have the outputs at the top, this will have issues with cooling IMO. Guys this is a big amp , the others look fine and most likely this amplifier might require 2 chassis and or for sure large custom case . Please do not compromise the boards to try and fit in some kind of micky mouse cage , this is a big bwoy amp, please keep it as such ....


Last edited by a.wayne; 24th July 2011 at 03:03 AM.
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Old 24th July 2011, 02:54 AM   #250
a.wayne is offline a.wayne  United States
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This is a 20 output device amp, i cant see one wanting to use less than 2 /500 va trannies or one 1 Kw tranny ...

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