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Old 22nd October 2010, 05:07 AM   #171
EUVL is offline EUVL  Europe
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I need to know total weight per chassis, divided by cost (incl heatsink) to get kilo price of AL (in sheets and extrusions).

Cost can be much lower by using thin sheets like you do.
I am using 8mm bottom and 4 mm top & rear. 15mm front.


Patrick
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Old 22nd October 2010, 05:21 AM   #172
qusp is offline qusp  Australia
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Quote:
Originally Posted by EUVL View Post
Maybe we should just machine the rest, send them all 50 sets to you, let you order the Conrad heatsinks, and you ship them on to those lucky buyers.



But maybe shipment cost is not too cheap down under, compared to Hong Kong, Singapore, and the like ??


Patrick
hehe, I think I would be buried in cases, though my new workshop is sized to account for this. if this is serious offer I would consider it, but I do think it would be better to go with somewhere in china, as shipping is rather pricey here and we are further from the rest of the world. shipping to asia from here would be fine, but I fear to the ROW would be expensive.

John, yeah the ego I think can weather it, problem is though that I am still toying with the idea of using this as part of a set of active speakers for the mid/highs (Class D bass). I dont have the speakers for this yet (my current speakers are active studio monitors), it is next project starting serious research and first purchases now.
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Old 22nd October 2010, 06:07 AM   #173
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Patrick

Is It confirmed that Conrad MF35-151 can get 130 W heat
how the pairs would be placed - In one row or two
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Old 22nd October 2010, 06:14 AM   #174
qusp is offline qusp  Australia
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look at the conrad site, they have all the info you need WRT the dissipation
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Old 22nd October 2010, 07:14 AM   #175
Luke is offline Luke  New Zealand
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Quote:
Originally Posted by thanh1973 View Post
The total cost of aluminium (cut to size) to make 7 cases of varying dimensions was $240.
So on average that comes out to about $35 per case.
A conservative guess for the big cases would probably be about $50 to $60 per case (it might actually be cheaper than this).
To do the cases you see in the picture the cost of aluminium would have most likely cost around $25 per case.
I used 10mm for front plate and 3mm plate for top, bottom and back plates.
I will get more detailed info later.
thanh1973,

you guys dig a hole in your back yard and find gold nuggets. I think cost of Aluminium in Australia is probably not a fair representation. Here its alot more expensive but I can not recall the costs. I expect usa and europe is spendy too.
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Old 22nd October 2010, 08:12 AM   #176
qusp is offline qusp  Australia
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indeed the cost of al here is quite good as its abundant, perhaps a reason to find a firm here to do the CNC? then couple with the sinks (also here) and ship. does this sound like a plan?
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Old 22nd October 2010, 08:19 AM   #177
Variac is offline Variac  United States
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Quote:
Originally Posted by EUVL View Post
Don't forget that pre-tapped holes on a general pattern means more holes than you might need, and hence more costs.




Patrick


PS Thank you Mark for your kind words. I am glad you like the case design.
We shall publish it when the forum is ready to organise a group buy of some sort.

.
I have found that with CnC a few extra holes doesn't cost much more..
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Old 22nd October 2010, 08:57 AM   #178
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Originally Posted by EUVL View Post
Cheap and nasty does not go with the name "EUVL".
You're the best, Patrick.

(and amusingly outspoken at times)
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Old 22nd October 2010, 09:34 AM   #179
massimo is offline massimo  Italy
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Originally Posted by samoloko View Post
Patrick

Is It confirmed that Conrad MF35-151 can get 130 W heat
how the pairs would be placed - In one row or two
As Patrick stated that his design is using zenner referenced regulators (2 per channel, I guess) in the P.S. we must consider the added Pd of those mosfets (4-5 V * 2 A * 2 = 16-20 W per ch. roughly), unless they have their own heatsink.

Last edited by massimo; 22nd October 2010 at 09:38 AM.
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Old 22nd October 2010, 09:37 AM   #180
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Just an update on resistors.
I managed to find some Futaba MPC71 5W 0.22 Ohm resistors in my parts box (basically the same as mpc74).
I tested them at both 1A and 2A and the performance is as good as two cpf3 3W resistors in parrallel.
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