CS4397 dac

[Puffin]

jonners. Thanks for your reply. Some years ago Elektor had an article for an Up-Sampler. I got the board and sourced all the parts, but as I was fairly new to bodging, I messed up a couple of SMD's and I think I lifted the pads. I wll have to dig it out and see if I can resurrect it.

I am using 22ohm resistors and 15uf caps. Maybe the caps are a little too high in value. I tried some 2.2uf, but the 15's seem to suit it better.

Good fun this lark in it.

[Puffin]

In 2001 I built the up-sampler mentioned above. The main chip and supporting caps/resistors are SMD's. Knowing very little then I built the kit and hoped it worked. (standard of soldering is incredible looking at it now as I didn't really know what I was doing) It didn't work or at least I didn't think it did until last night!. I had kept the Elektor mag and article and decided to re-read it thouroughly. With the greater knowledge I have now, things started to make more sense. There are 3 jumpers one for Coax/Opt another for Master/Slave and a third. They only sent me two jumpers with the kit and so I ignored the third. Reading the article with my better understanding told me that the third set of pins could be used to add an additinal crytal oscillator and if you were not going to do this you should............fit a jumper on it!

So, that's what I did and after 7 years, it works !

Next step to lift pin 2 and and enjoy 96khz CD's !

[Puffin]

Well, looks like it's my go again. I like this game I get to win all the time !

Seriously now. I have done the surgery to get 96khz. Up-sampler is working and will give it a few days to gel and will report back.

If anyone wants to see the Elektor article, let me know.

[jonners]

Well, looks like it's my go again. I like this game I get to win all the time !

That's right, and talking to yourself ensures that you get a sympathetic listener!

Will be interested to hear what you think of it at 96kHz. Slighly smoother and more spacious in my system, but not a night and day difference.

[Mr. C]

John if your up-sampler can output 88.2khz give that a try, you may find it gives you back some of the music. Nice works by the way guys :-)

[STIFA]

@alb @all
About C9 and best cap...I can't seem to be able to find VIshay anywhere near me and as for ERO i found following:
0.22uF/100v MKC
0.33uf/250v MKC
0.47uF/100v MKC
1.0uf/63v MKC
1.0uF/100v MKT
0.30uF/250v MKP
0.33uF/400v MKP
0.33uF/250v MKP 1840 5%

so could I use some of the above? Also what is the voltage for C9 and other cap bypasses and their uF values?

Also what is the voltage of OS-CONs , I plan to replace all stock with 150uF Sanyo os-con, but is there a minefield in choosing voltage? Options are 6.3v 10v and 16v.

Thanks

[jonners]

John if your up-sampler can output 88.2khz give that a try, you may find it gives you back some of the music. Nice works by the way guys :-)

Yes I've been trying that - don't know which I prefer just yet though.

[Puffin]

Used it for a couple of hours tonight and I like the combination a lot. Can't quite put my finger on exactly what the up-sampling does, I suppose it's quite subtle, but at the same time it seems to add depth and more realism.

[STIFA]

on Lampizator.eu I fount this text :
DO NOT TOUCH THE circuit consisting of C22, C23 and R2 !!! This is a resonator.

Problem is that the leads on capacitors act like antenna I think.

Should they be replaced with high quality SMD parts then instead?

What are your impressions?

[jonners]

There is some info. about this here: http://rockgrotto.proboards39.com/in...ad=1672&page=5