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Old 17th November 2010, 03:56 AM   #571
_henry_ is online now _henry_  Australia
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i dont like to buy copies also. i bought the boards from cviller and parts from tech diy.

just saying in general.

alot of agressiveness here

cheers
henry
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Old 17th November 2010, 04:00 AM   #572
Horio is offline Horio  United States
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The coefficient of thermal expansion for aluminum is 12.3 x 10^-6 inches per degree Fahrenheit. So if you have a difference of 20 to 65 Celsius, thats roughly a difference of 70 degrees Fahrenheit. Over a PCB that is say 6 inches long, that means the aluminum would expand roughly 0.005 inches (assuming I didn't mess up on the crappy windows calculator).

I wouldn't think that's going to pose any problems.
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Old 17th November 2010, 04:40 AM   #573
EUVL is offline EUVL  Europe
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There is enough flexibility in the bended legs of the MOSFET to allow for such differential expansions, something that is more difficult with SMD components.

Patrick
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Old 17th November 2010, 05:08 AM   #574
EUVL is offline EUVL  Europe
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> alot of agressiveness here

Was not intending to be. My apologies.

If you know manufacturing in China, then you know that you can get from junk to top quality, with vastly different prices.

Just take the front panel. You can use US imported 6061, or Chinese 6061.
If you black anodise, then you would probably not notice any difference.
If you do matt silver anodise, you can tell which is which immediately.
And we have thrown away a thousand USD's worth of front panels (for our own use) just for that reason.


Patrick
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Old 17th November 2010, 07:20 AM   #575
Luke is offline Luke  New Zealand
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Quote:
Originally Posted by EUVL View Post
> alot of agressiveness here

Was not intending to be. My apologies.

If you know manufacturing in China, then you know that you can get from junk to top quality, with vastly different prices.

Just take the front panel. You can use US imported 6061, or Chinese 6061.
If you black anodise, then you would probably not notice any difference.
If you do matt silver anodise, you can tell which is which immediately.
And we have thrown away a thousand USD's worth of front panels (for our own use) just for that reason.


Patrick
Perhaps next time you might consider offering them for sale here on DIYA.
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Old 17th November 2010, 07:36 AM   #576
_henry_ is online now _henry_  Australia
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hi patrick,

im kind of curious what would be the difference is? the chassis i bought wast machine milled from a alum profiles extrusions.

i dont know for sure the grades they are using, but it does look less pleasing as PASS XA AMPS.

cheers
henry
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Old 18th November 2010, 02:42 PM   #577
EUVL is offline EUVL  Europe
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Another update :

Variac is now up to speed and we had our first team meeting by email.

I received the draft of 3 of the PCBs today and shall check them in the next day or so.

We agreed who would be doing the prototype builds, etc., and we also agreed that all PCBs will be prototyped and tested first before volume production.

We also had the first discussion with the case production people.
Apart from a few things that need finalising, we think we'll be able to keep to the promised production costs.

So things are moving at pace, at last.





Patrick
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Old 19th November 2010, 12:02 AM   #578
_henry_ is online now _henry_  Australia
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great news
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Old 19th November 2010, 05:11 PM   #579
EUVL is offline EUVL  Europe
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The prototype team might be ordering transformers in the next couple of weeks.

Details see -- Balanced F5 question

With electrostatic shield. No encapsulation in a can.

Anyone else interested ?


Patrick
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Old 19th November 2010, 05:48 PM   #580
AndrewT is offline AndrewT  Scotland
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Could put me in provisionally for two transformers.
I'll confirm when prices & postage are firmed up.
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