CS4397 dac

[belgiangenius]

Any comments on whether this DAC really needs an output stage LPF to eliminate 400Khz noise that some people refer to?

[hansr]

anyone news about the plopping as described above? I do have the same problem when connected via toslink to my Ac Ryan mediaplayer.

Is there somethink we can change? looks like the dac is having problems to lock on the signal the mediaplayer provides.

please help!

[kput]

Hi, I am experienced using Mundorf Silver/Oil and KSG capacitors further. I think, despite of high respect of Mundorf S/O, they colors the sound a lot, KCG-s do as well, maybe not that much. There is a very important capacitor, namely C9 (DC blocking capacitor) just in SERIES in the signal path. I got some Russian military SSG-3 (CCГ-3) 126 nF/350 V Silver Mica’s from Vilnius. Because of their size, I made a new rout to receiver chip via a BNC terminal installed (do not forget there is a 75 ohm between signal to ground just before silver mica). I put 0,252 nF CCГ-3 silver Mica’s (C9). The result is surprisingly good (stunning). I highly recommend trying this tweak. János (to get CCГ-3, search on US e-bay)

hi janos can you explain a bit clearer what you did with the silver mica on c9????I think I would like to give it a go but cannot understand what you have done...alan

[leo]

Nice to see the modding is still going quite strong for these dacs, I've not used mine for a while (its currently on loan) so may have a bash at another

Just a note to the new members, can you please pop into the welcome section of the forum to keep the site owners happy

I can't remember all the part numbers for the dac but I presume C9 is for the SPDIF input coupling

[Puffin]

I recently did a passive mod to this dac. Not bad.

[leo]

Agree, not bad for a cheapie

[Marco]

Hi 'AndersN', 'Ekke', 'yiannis', 'fandersen', 'BlackNight', 'kput', 'hansr', 'belgiangenius' and 'janos_904',

Welcome to AOS

Could you please pop into the Welcome area and introduce yourself to our community by supplying your proper first name, basic geographical location, system details and music tastes, as this is the requirement for all new members joining AOS.

Cheers!

Marco.

[fandersen]

After successfully building one of these DACs -- thanks Leo, et al -- I ended up at diyaudio to learn about bypassing the opamp with transformers. The diyAudio thread is very long but full of info on implementing transformers. I ended up installing Jensen JT-11p-1 transformers but there are lots of options. IMO, a worthwhile upgrade.

[Marco]

Hi 'fandersen',

Please see my post above and pop into the Welcome area and introduce yourself before posting any further on the main forum. You are joining a community here, not simply an information resource to use at your leisure.

This also applies to other new members who've posted here and haven't yet introduced themselves properly. I would ask that you observe the required protocol.

Thank you

Marco.

[fandersen]

Hi 'fandersen',

Please see my post above and pop into the Welcome area and introduce yourself before posting any further on the main forum. You are joining a community here, not simply an information resource to use at your leisure.

Yup, I did (based on your earlier post). I apologize for not doing this at the start but I think we all start by lurking a bit and then get wrapped up in the wealth of knowledge on the forum. I'm still very much a newbie in diy audio but learning quickly and hoping to one day contribute more than just my enthusiasm for this hobby.