New Small DIY Gigawork Dac?

[Tolu]

LM49720 and LM4562 are exactly the same parts (just a new name) so you can not hear any differences!

Another question: does the 24Bit/192kHz mode work? the old version had a failure with that mode!

[robertor]

the lampucera twentyten arrived today.

just changed the op amp with the TLE2026.

i find it sound well, very well.

spaciousness, articulated bass, and with the new opamp more sweet than the NE5532.

ok, now i little running in.

szia!

[robertor]

i'd like o change the third opamp with the OPA627.

think it will be possible?

[Tolu]

Hi Rob

could you please test the 24bit/192kHz mode?

Btw what is TLE2026? Datasheet?

[robertor]

hi tolu,

i don't know the way to test for 24/196.

i know the cs8416 "has born" to work 24/196.

the tle2026? sorry for my BIG mistake, i use 2 tle2062 and the third a tle2082.

TI excalibur: Precision Amplifier - High Output Current - TLE2062 - TI.com



somebody have tried some modding?

[mootzeroni]

Originally Posted by Tolu

LM49720 and LM4562 are exactly the same parts (just a new name) so you can not hear any differences!

Another question: does the 24Bit/192kHz mode work? the old version had a failure with that mode!

1) glad my newbie ears are honest then

2) 24Bit/96kHz & 24Bit/192kHz flacs both playing beautifully... oy, now i gotta start a silent PC project as i don't have another high bit-rate source! I'll probably spring for a juli@ s/pdif upgrade while i'm at it (unless someone can suggest a good/fast/cheap better solution.

this whole hobby is really getting to be a problem

[robertor]

but really you have some files 24/192?

[grael]

You can get some free and legal 24/192 flac here :
High Resolution Music DOWNLOAD services

About my passive output project, I got my LL1636 transformers, I'm still waiting for some parts (resistors, box, wires...)
I'll report back when I'll manage to get all of this running together!

[robertor]

me too i'd like use the transformers like output but, i think in my big ignorance, without schematic........... nothing to do.

the first thing for a dramatic improvment would be to replace, if there are, the output capacitors.

usually are elko or worse.
better will be replace it with film capacitors(polypropilene?).
i ask for the schematic to the seller but not news yet arrived.

[grael]

I got the schematics with the DAC, but it is barely readable.
I asked an electronic version to the seller, but no luck...

I dont' think there are output capacitors.

For the transformers, I took inspiration from this passive output from Rakk :
Passive output

But he is using a PCM1794 where our dac uses a PCM1798.
Smaller output current, so I went to the LL1636 transformer which can be wired as 1+1:10 to get a higher output level. And some 15Kohm resistors for I/V conversion.

I'll give feedback as soon as I have all the remaining pieces.