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Old 22nd October 2010, 11:02 AM   #181
ashaw is offline ashaw  Australia
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Could I get in on that GB, but as I live in Australia, it might be best to not ship the Heatsinks to Europe and back, could I have them shipped to Newcastle, NSW?
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Old 22nd October 2010, 11:41 AM   #182
EUVL is offline EUVL  Europe
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Someone asked me what PSU I used. I did use a regulator.
But I have a monoblock minitower with lot of heatsink.

It does not means you also have to use a regulator and hence extra dissipation.
Even if you do, you can use a bipolar sziklai instead of a MOSFET as cap multiplier.
That will minimise the dropout voltage.

As for the Conrad MF35-151, it will dissipate 130W at 3įC temperature rise (above ambient).
This is datasheet value.
I don't use them, so I have no measurement to back up.


Patrick
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Old 22nd October 2010, 11:44 AM   #183
EUVL is offline EUVL  Europe
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PCB Progress :

One side copper is done, still one copper side, 2 solder masks, and one component placement.
Looking good.




Patrick
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Old 22nd October 2010, 11:52 AM   #184
EUVL is offline EUVL  Europe
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MPC74 has thicker leads and is no magnetic. Otherwise same as MPC71.


Patrick
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Old 22nd October 2010, 11:57 AM   #185
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Quote:
Originally Posted by EUVL View Post
PCB Progress :

One side copper is done, still one copper side, 2 solder masks, and one component placement.
Looking good.




Patrick

Joy


Aussie builders, we should get together to save on shipping. Any thoughts? Iím Sydney based.
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Old 22nd October 2010, 12:20 PM   #186
EUVL is offline EUVL  Europe
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Please take my word and be patient with the casing.
We will work out a solution to minimise your cost, including people from down under.
But we need time to look at different scenario before we can give you a balanced proposal.

I own no shares of the Australian / US / Deutsche Post.


Patrick


Realistically, we'll be ready to take oders (if we end up that far) no sooner than mid December.
So you won't get it for X'mas.
And then you probably want to wait till AR2 finish the proto and tell you how he builds it.
But you will definitely finish before X'mas 2011.



.

Last edited by EUVL; 22nd October 2010 at 12:23 PM.
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Old 22nd October 2010, 12:28 PM   #187
qusp is offline qusp  Australia
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yep, for sure, I still need to decide if i'm going with the chassis, have to see if its excellence is enough to sway me from going with it inside my speaker enclosure as an active (which has been my plan all along) to perhaps sitting directly behind or underneath. but for other parts yes indeed. like sumR trannies, output devices etc.

timing is fine Patrick, i'm in no hurry, no speakers yet and need to put some dollars aside as wallet recovers from recent thrashings, I would be disappointed if you were ready too quickly ;D

Last edited by qusp; 22nd October 2010 at 12:31 PM.
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Old 22nd October 2010, 12:36 PM   #188
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Without fail you'll get a performance benefit from removing the amp (and the crossover) from a speaker enclosure. Too many components that are either microphonic or interact with each other to end up with a low distortion product.
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Old 22nd October 2010, 12:37 PM   #189
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what Is recommended transformer 2x12Vac or ?
I will not use regulator
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Old 22nd October 2010, 12:40 PM   #190
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Quote:
Originally Posted by thanh1973 View Post
I tested them at both 1A and 2A and the performance is as good as two cpf3 3W resistors in parrallel.
Did you compare noise? I also have access to a device that can measure under 1mOhm but I think the best method is to tune after the fact with a distortion analyzer. Prebuilt and trimmed F5X modules would be the way to go, but would be 4x the cost probably. Similar to Twisted Pear Audio's approach.
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