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Old 21st October 2010, 12:39 PM   #131
Bksabath is offline Bksabath  United Kingdom
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I stand corected tanks

Spread sheet looks good

Will folow on this on my Build

Tanks again

Al
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Old 21st October 2010, 03:07 PM   #132
qusp is offline qusp  Australia
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Quote:
Originally Posted by johnwmclean View Post
Oh Yeah, this is now looking very exciting.
indeed it is my friend. i'm gonna build this too if posible, we should go in on a conrad order for it
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Old 21st October 2010, 03:07 PM   #133
EUVL is offline EUVL  Europe
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> How well matched do these resistors need to be?

Not better than your MOSFETs, which means 10mV at bias (2A), which means 5mohm.

I am sure you can also make a good measurement with a wheatstone bridge. My point is that to be sure, you should do your measurements under working conditions. Matching done that way leaves no doubts. Of course you can compare a range of methods and conclude that they all gives you consistent results, and then you can choose the easiest one.

I shall stick to my principle -- matching under working conditions.


Patrick
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Old 21st October 2010, 03:16 PM   #134
EUVL is offline EUVL  Europe
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> we should go in on a conrad order for it

You guys are sometimes really very impatient.

Variac is discussing with us on behalf of the forum the possibility of manufacturing for them a small batch of a semi Hi-End housing for building Class A amps. We have submitted to him a draft design which will take 300W dissipation at ease (that works out to about 100W Class A output). Will do 2 channels nicely. (Hope you don't mind Variac.)

This proposed design has 2 Conrad MF35-151 heatsinks, 15mm solid aluminium front plate, 8mm AL bottom plate, 4mm AL top and rear, with stainless steel handles, feet, and push button. Weighs about 15kg, which is probably the problem. 15kg Aluminium costs money, so is shipment.

You'll have to wait till we come to an agreement first before I publish the design. I can only tell you that it does look gorgeous even by my standards.




Patrick


PS We retain ownership of the design !!

.

Last edited by EUVL; 21st October 2010 at 03:21 PM.
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Old 21st October 2010, 03:24 PM   #135
EUVL is offline EUVL  Europe
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For those who cannot wait and would not want to spend money on cosmetics, here is an example of a commercial solution :

Kühlkörpergehäuse 008.37 (VE=1Stück)

4mm AL front, 2mm steel plates all round. About same size heatsink.


Patrick
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Old 21st October 2010, 03:32 PM   #136
NYCOne is offline NYCOne  United States
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I may have news on this front as well.

I'm waiting for a delivery of a Conrad MF35-151 based solution. It's semi custom made. The seller has a base set of materials and one tells him how to modify the parts. I've seen the pictures of the one I ordered, I should have it in hand in a week or so.

The individual's goal is to turn this into a DIY service.


Quote:
Originally Posted by EUVL View Post
> we should go in on a conrad order for it

You guys are sometimes really very impatient.

Variac is discussing with us on behalf of the forum the possibility of manufacturing for them a small batch of a semi Hi-End housing for building Class A amps. We have submitted to him a draft design which will take 300W dissipation at ease (that works out to about 100W Class A output). Will do 2 channels nicely. (Hope you don't mind Variac.)

This proposed design has 2 Conrad MF35-151 heatsinks, 15mm solid aluminium front plate, 8mm AL bottom plate, 4mm AL top and rear, with stainless steel handles, feet, and push button. Weighs about 15kg, which is probably the problem. 15kg Aluminium costs money, so is shipment.

You'll have to wait till we come to an agreement first before I publish the design. I can only tell you that it does look gorgeous even by my standards.




Patrick


PS We retain ownership of the design !!

.
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Old 21st October 2010, 03:39 PM   #137
qusp is offline qusp  Australia
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yep conrad is the go, love being just up the road
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Old 21st October 2010, 03:47 PM   #138
EUVL is offline EUVL  Europe
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You will not tempt me into disclosing the design until the agreement is through.
If it does not work out, it will remain secret forever.



You know me by now. I only do 100% perfect solutions.
And this will be special offer to the forum, and they then offer them to you for a profit to keep this place up.
(assuming what we offer is what they would like in their product range)


Patrick


PS 2x Conrad MF35-151 weighs in at about 5kg.
Each of them is sufficient for 1 channel F5X.

.

Last edited by EUVL; 21st October 2010 at 03:54 PM.
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Old 21st October 2010, 03:58 PM   #139
TheShaman is offline TheShaman  Europe
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Quote:
Originally Posted by EUVL View Post
If it does not work out, it will remain secret forever.
EUV(I)L..

...that this works out as planned!
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Old 21st October 2010, 04:10 PM   #140
EUVL is offline EUVL  Europe
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Let's do a poll perhaps ......

How many of you would like a gorgeous looking enclosure (more comparable to PL than to FW in terms of design sophistication) ?
And how much are you prepared to pay ?
(Do bear in mind that 50 other guys would have the same design as you ....)

To give an example, the Origen H6 HTPC Enclosure which has 8mm AL front plate and rest thin sheet metal is selling for something like 250 to 300 Euros.
Looks gorgeous, but does not weigh 15kg. And sheet metal stamping rather than CNC machining.


Patrick

.

Last edited by EUVL; 21st October 2010 at 04:14 PM.
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