DAC 2496 (AK4393) DAC KIT With CS8416+AK4393+5532 - Page 236 - diyAudio
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Old 7th January 2013, 12:16 PM   #2351
erin is offline erin  Australia
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Well, I don't know if you have heard the sound of a genuine OPA627 before?

I bought some of the dual to mono OPA627 from Audjade in May 2011.
To my ears, they don't sound anything like an OPA627! I don't believe them to be the genuine article. On the off chance they genuine, I believe them to be static, or thermally damaged to the point where they sound nothing like they should.

My recommendation would be to stay away from op-amps from that seller.

Of course your experience might be different, my gripe is not with you, but the seller Audjade.

Last edited by erin; 7th January 2013 at 12:24 PM.
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Old 7th January 2013, 08:06 PM   #2352
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Hi Erin,
AudeJade states cleary that these modules use s/hand op-amps so your comments about thermal damage are probably right. For the price it's worth a punt especially as this DAC uses a voltage out chip and using the op-amp is my second choice. The caps I bought from him measure fine - he certainly packs his stuff very well.

I saw something interesting about Schottys but they are type that is no good for the DAC as they are 600V and TO-220. So I shall make Schotty bridges from the axial type.
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Old 7th January 2013, 10:03 PM   #2353
Djinn is offline Djinn  Norway
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On the board near the 1N4148 diode, next to C28 (Nichicon LF 10uF 16V) there is originaly an 1uF 50V capacitor, but I can not find anything in the BOM of an supstitute?

On the populated picture on the google drive, there is a cap there but I can not find anything about it?


With regards

Martin
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Old 7th January 2013, 11:27 PM   #2354
Djinn is offline Djinn  Norway
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Quote:
Originally Posted by Djinn View Post
On the board near the 1N4148 diode, next to C28 (Nichicon LF 10uF 16V) there is originaly an 1uF 50V capacitor, but I can not find anything in the BOM of an supstitute?

On the populated picture on the google drive, there is a cap there but I can not find anything about it?


With regards

Martin

Search and you will find, so I did and found the answer in post 1679 Click the image to open in full size.
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Old 8th January 2013, 11:41 AM   #2355
erin is offline erin  Australia
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Quote:
Originally Posted by Black Stuart View Post
. The caps I bought from him measure fine - he certainly packs his stuff very well.

I saw something interesting about Schottys but they are type that is no good for the DAC as they are 600V and TO-220. So I shall make Schotty bridges from the axial type.
I've bought caps from him before and they were fine.

Just personally can't recommend the op amps. There is a saying, if its too good to be true - it probably is. I think these op amps are an example of this.
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Old 9th January 2013, 12:23 AM   #2356
spicer is offline spicer  Canada
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I bought the dac with some pieces on it.

PCB SMD IC New Hi End DAC 24 Bit 192K Hz AK4393 SC | eBay

I want to build it like yours.


what are the stats (value) of pieces that you didn't change on your dac?

Ex. L1 NPO

Thank
Spicer
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Old 9th January 2013, 02:57 PM   #2357
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Erin,
did you give AudeJade/Ma Lee a chance to put things right re. the op-amps. If I find that the op-amp module is crap I will get in touch with him, quote - If you are not satisfied, please don't give negative as I will try my best to resolve problems - just contact me.

Well did you?
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Old 11th January 2013, 04:13 AM   #2358
Djinn is offline Djinn  Norway
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Default 10nF FKP2 opamp decoupling alternative size and type?

I see Darios BOM recommends the FKP2 10nF, and I am also using this one and I think it sounds really really nice.

But if I would like to try say an alternative like a polysterene or say any other type of cap "in the spirit of a true DIY'er" that I just could not get in this value, would a 6.8nF capacitor be much of a problem/loss here?

PS! Thank you very much for your previos reply Dario.

With kind regards

Martin
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Old 11th January 2013, 05:40 PM   #2359
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Would someone be able to tell me what the maximum current for the bipolar 15V supply and unipolar 9V supply?

Also is there layout diagram for the pcb showing R1,R2 etc?
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Old 11th January 2013, 09:15 PM   #2360
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Quote:
Originally Posted by Djinn View Post
But if I would like to try say an alternative like a polysterene or say any other type of cap "in the spirit of a true DIY'er" that I just could not get in this value, would a 6.8nF capacitor be much of a problem/loss here?
I wouldn't go lower than 10nF. Polystirene are a good choice.

Quote:
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PS! Thank you very much for your previos reply Dario.
You're welcome Martin.
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