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Old 19th February 2013, 07:31 AM   #1471
FdW is offline FdW  Netherlands
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Quote:
Originally Posted by Abraxas336 View Post
I assume J309 is supposed to be J109 in your post.
No and Yes, sorry for that. I did say J309 and the resistor change is for using a J309. I misread the post, now I did check the effect of using a J109 and I have to conclude that the existing 3.3k resistor is o.k. (Id when using the J109 will be about 1.2mA).

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Originally Posted by Abraxas336 View Post
Everybody who participated in the parts GB recieved J109 and it was news to me that I should (may?) change resistors.
And I overlooked that

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Originally Posted by Abraxas336 View Post
In this case it would make sense to add your comment regarding R108/208 to the assembly guide/BOM.
Not needed, see J309/J109 explanation above.

Last edited by FdW; 19th February 2013 at 07:38 AM.
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Old 19th February 2013, 08:05 AM   #1472
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Argh... we certainly managed to confuse everybody now.
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Old 19th February 2013, 08:22 AM   #1473
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Originally Posted by Abraxas336 View Post
Argh... we certainly managed to confuse everybody now.
Yes I did

To restate and be totaly clear:
The J109 can be used as a direct replacement for the J310
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Old 19th February 2013, 09:13 AM   #1474
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Originally Posted by Abraxas336 View Post

Ricardo: Thanks. Reason for my question is I would like to avoid any additional emphasis of anything since my system has plenty resolution anyways. However, now I have 11n/33,36n caps which I ordered specifically for the paradise. I'm a bit reluctant to change these, changing a couple of R's however is ok.
Hi Sven

If you must use those caps, and you want a linear response, than I suggest:

9532ohm instead of 9k1 i series with 33.36nF cap
If even after that you feel there is too much trebble enfasis, add 400pF styroflex to the 11nF cap.

If you feel there is too much bass enfasis, use 140k // 143k to get 70.7kr on the bass resistor instead of the stock 73.5k

Please note that these are simulated alues to get a straight response... these are not my prefered values but IMO they will work fine.
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Old 19th February 2013, 03:11 PM   #1475
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Success!

Well, partially . Regulators are working. Rails are a bit to high, 27.2V so the heat sinks get too hot, 60C after 30 minutes. Will probably have to use larger heat sinks or go with the Preregulator...

Click the image to open in full size.
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Old 19th February 2013, 03:29 PM   #1476
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Originally Posted by Abraxas336 View Post
Success!

Well, partially . Regulators are working. Rails are a bit to high, 27.2V so the heat sinks get too hot, 60C after 30 minutes. Will probably have to use larger heat sinks or go with the Preregulator...

Click the image to open in full size.
You could split the PSU capacitor's in groups of two (so to see) and add a resistor inbetween (5.6 Ohm will be spot on).
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Old 19th February 2013, 03:38 PM   #1477
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Yes, i also had the idea to use a voltage drop resistor.
Your build looks fine.
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Old 19th February 2013, 03:40 PM   #1478
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I have some 5.1 - 2W good enough?
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Old 19th February 2013, 03:41 PM   #1479
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I have some 5.1 - 2W good enough?
Yep will do, give it a bit of air. Do not mount against the board and not to near the capacitors. The power disipation will be about 1 Watt each.
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Old 19th February 2013, 03:46 PM   #1480
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Thanks. Sorry, yet another question - the PS is made of leftovers, so I have 2 4700uF and 2 1000uF per rail in that order. Is it ok to do the CRC 4700-R-4700-1000-1000 or does it have to be 4700-1000-R-4700-1000 (which means I have to shuffle caps).

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