CS4397 dac

[iihay]

you got a bad track ,joint or resistor I reckon

Look at the voltage reading of the differential out of the dac , + is 1.4v, - is 1.4v
Differential to line out this should give 0v

A clue, whats the DC offset out of that dodgy channel? you got one half missing

Don't go making yourself into a bloater with all that choccy

Got to find it without breaking anymore pads, fun starts here I guess! So I should start looking on the knackered side. What's the best method here, pull up the schematic and compare points from the good side (as a reference) to the bad until I hit a difference?

Cheers

Iain

p.s. stopped with the choc and hit the single malt!

[leo]

Got to find it without breaking anymore pads, fun starts here I guess! So I should start looking on the knackered side. What's the best method here, pull up the schematic and compare points from the good side (as a reference) to the bad until I hit a difference?

Cheers

Iain

Yes, I'd imagine if the DC offset is +1.4v it'll be the -1.4v side , I'm also supping so my brains not fully functional

p.s. stopped with the choc and hit the single malt!

Good choice

[iihay]

lol, I know the feeling. I can't work out which side is which now, it can wait as I'm not minded to burn or fry myself tonight!

Iain

[lionking]

Hello every one

that kit needs 12v transformer to work?
http://cgi.ebay.co.uk/High-Grade-24b...742.m153.l1262

Whats the best amount of VA to a transformer for this kit?

I am thiking of buying it and that transformer doesnt look
very nice!

6f62_1_sbol.jpg

Thanks

[leo]

Those plastic encased transformers can suffer from mechanical buzzing which could prove to be annoying
You don't need huge current for this sort of application, some will argue larger VA is best and others will say its wasting money

When playing with this dac I used a 60vA toroidal because its what I had spare

[Tripmaster]

Hi Leo

This DAC has been getting a great write up over on DIYA. Have you ever tried using one of those transformers?

http://www.diyaudio.com/forums/showt...hreadid=137976

[leo]

Hi Leo

This DAC has been getting a great write up over on DIYA. Have you ever tried using one of those transformers?

http://www.diyaudio.com/forums/showt...hreadid=137976

I can believe it getting quite a lot of attention, their cheap and sound pretty good once a few issues on the standard thing have been sorted out

I've not tried the transformers, tbh my objective with this dac was to keep it as a cheap project with decent performance

[leo]

Of course thats not to say don't try transformers I tend to try as many projects as I can and post results/opinions
Start cheap and folks can go further if they like

[mace]

Hello,

My name is Ivo and I registered here just for this thread.

I was browsing that lampizator site and I stumbled across the DAC, I was intrigued and I had to order one. So I did. Googling brought me here.

Now I've had it for a couple of days and I've been modding it as per the standard stuff, I changed the opamp for a LM4562, I changed the PLL parts, I changed some of the caps for OS-CON, I kinda like the sound of those, and some for generic Low-ESR. I removed the coupling caps and I'm about to change the caps + resistors around the opamp to see if I can't get the offset voltage down.

I tried 0,22 uF wima bypass caps on some of those SMD ceramics, but it completely killed the sound, it became muddy and cluttered. I've since removed them and the awesome clarity is back.

I've got some Vishay/Roedenstein 0,1uF in the mail (the big-ish blue box caps) and I'm gonna see if those improve the sound any.

Well, nothing to add really, just wanted to say that I love this little gem of a DAC and I love the people here for all the information they've created.

[alb]

I've got some Vishay/Roedenstein 0,1uF in the mail

Mace.
If you have ordered Vishay/ERO MKP1837 0.1uf, then make sure you put one in place of C9 (input). These were the best caps- in my opinion- for the job. I tested quite a few.
I found this to be the greatest single improvement, while i was upgrading.
Its tempting to replace and bypass loads of caps all at the same time. But not so easy to go back if you don't like the effect.