DAC 2496 (AK4393) DAC KIT With CS8416+AK4393+5532 - Page 181 - diyAudio
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Old 20th May 2012, 12:16 PM   #1801
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Join Date: Mar 2001
Location: Brazil
Quote:
Originally Posted by bcmbob View Post
This is the item in the picture. The only thing special about it are the staggered plates as seen in the description. Well made and inexpensive.

DACT Type 21 Stepped Attenuator / Volume 20K for PreAmp | eBay
I completely agree with Bob on this one. That is the stepped pot I've been using for some time and it's excellent.
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Old 23rd May 2012, 02:41 AM   #1802
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why my kit Assembled error LED lights and do not come out sound ?
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Old 23rd May 2012, 06:19 PM   #1803
macklij is offline macklij  United Kingdom
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Quote:
Originally Posted by Lucky Hawk View Post
why my kit Assembled error LED lights and do not come out sound ?
Check the further up this thread (there a many pages). I think people have had similar problems when the are short circuits on the board. Check the chips with a magnifying glass.

Good luck
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Old 24th May 2012, 09:41 AM   #1804
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Location: stockton on tees
I like my NE 5532 to OPA827 change.

Has the OPA been on a scope as in the thread?

Swapping Op-Amps... you have checked to see it's stable haven't you ?
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Old 28th May 2012, 12:33 AM   #1805
nphil is offline nphil  United States
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I have scoped my DAC2496 (AK4396), that uses a dual OPA627. It does not oscillate. I bought the OPA smt to dip board from vintage audio lab (from Taiwan.) I also use two Wima MKS2 (.22uF, 100V) caps to bypass the opamps. Using larger "boutique" caps could cause oscillations, because of the necessarily larger inductance associated with large caps. Besides, the MKS2s are designed as by-pass and decoupling caps. I assume that the OPA827 will also be stable if properly bypassed. Again, users of "boutique" caps, you will have to check for stability yourselves.
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Old 28th May 2012, 09:29 AM   #1806
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Hi, how have you used the bypass caps please
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Old 28th May 2012, 05:48 PM   #1807
nphil is offline nphil  United States
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I just used the 0.22uF Wima MKS2s instead of the orange Chinese 0.1uF caps, on either side of the op-amp. The logic for using 0.22uF MKS2s was as following...


1 The specifications from TI recommend a minimum of 0.1uF for one OPA627 and I have two on the satellite board.


2 The 0.22uF, 100V MKS2s fit the available space perfectly (see picture.) The caps lie flush with the mainboard (so that the length of the leads is basically zero.)


3 I have have a lifetime supply of them.


Sorry for the poor focal depth of the attached photo. There is another Wima on the other side of the op-amp board, of course.
Attached Images
File Type: jpg Wima_22uF.jpg (574.0 KB, 525 views)
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Old 28th May 2012, 07:54 PM   #1808
apoo is offline apoo  Germany
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Ive lost my orientation in this huge topic.. Can somebody tell me where i can find the post with the link with the BOM

apoo
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Old 28th May 2012, 09:59 PM   #1809
macklij is offline macklij  United Kingdom
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Quote:
Originally Posted by apoo View Post
Ive lost my orientation in this huge topic.. Can somebody tell me where i can find the post with the link with the BOM

apoo
DAC 2496 (AK4393) DAC KIT With CS8416+AK4393+5532
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Old 29th May 2012, 08:18 AM   #1810
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Join Date: Apr 2003
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Quote:
Originally Posted by nphil View Post
I just used the 0.22uF Wima MKS2s instead of the orange Chinese 0.1uF caps, on either side of the op-amp. The logic for using 0.22uF MKS2s was as following...


1 The specifications from TI recommend a minimum of 0.1uF for one OPA627 and I have two on the satellite board.


2 The 0.22uF, 100V MKS2s fit the available space perfectly (see picture.) The caps lie flush with the mainboard (so that the length of the leads is basically zero.)


3 I have have a lifetime supply of them.





Sorry for the poor focal depth of the attached photo. There is another Wima on the other side of the op-amp board, of course.
Thank you, all clear now
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