Reference DAC Module - Discrete R-2R Sign Magnitude 24 bit 384 KHz

[avr300]

Power to shift regs is ok. Vref also is ok.

Hmm?

 

[bmxmen]

Did you have +-4 on channel?but iv you have dc on output the shifts are broken. You should have 0.00dc on raw

 

[bmxmen]

Hi i have full batery powered 1021 by 3,3v nominal lifepo4 bateries. Board with no stock stabilizers. I was wondering about 1021 clock power supply. One frequency clock need 3.3v but linear, frozen 3.3v need to have that desired frequency. what is on 1021 clock? I have powered him by lifepo4 battery and wee all know that fulll charged bettery have 3.6v , not charged can have 3v. Did this is problem with desirded 1021 frequency in clock?

 

[analog_sa]

wee all know that fulll charged bettery have 3.6v , not charged can have 3v. Did this is problem with desirded 1021 frequency in clock?

This one is for the brave. And for those not shy to use a desoldering station

 

[bmxmen]

I know that i datasheet it is 10% tolerance . But mayby clock Dont have that freq that fpga want to.

 

[tiggerkater55]

hi there everybody,

do you know which serial numbers the different revisions of the dam1021 have?

rev2 starts with ser. number xxx
rev3 ...

i dont want to modify the board itself, so i am not so sure, if i should invest in rev5, or get e.g. a used board from rev2. (soundwise...)

thanks for your help!

 

[analog_sa]

But mayby clock Dont have that freq that fpga want to.

What i posted is for the clock.

 

[Blitz]

I have a simple question:

I still have two 1021 boards in my basement. I have built and modified the DAM1941 when it came out and listen to it and I am very satisfied.

There are some experiments though where I do not want to risk the main DAC (1941) and try this maybe with the 1021 instead...

Is the 1021 capable to get to the same level as the 1941 ?
Is there a summary of mods as it looks as of today (220 pages is a bit too much to read...) ? Air de-soldering or air-soldering is no problem.

Thanks for any hints !

 

[godady]

Hi, my 1021 is rev5.

Right channel had distorting yesterday. I measured positive side only 3.5Vref.

And I try it again today. It turn to 3.9x Vref. Very close to 4V. But sounds still have a little distorting....

Dose someone have know what happen with my 1021? How can I solve it?

 

[godady]

Hi, my 1021 is rev5.

Right channel had distorting yesterday. I measured positive side only 3.5Vref.

And I try it again today. It turn to 3.9x Vref. Very close to 4V. But sounds still have a little distorting....

Dose someone have know what happen with my 1021? How can I solve it?

I think I find the problem. If I do the Cap Mod's, Vref+ will drop down slowly. When I remove Cap. It will be ok.

But I don't Know why does it caused.

 

[avr300]

Søren, can you verify that these are appropriate?

74LVC595APW,112 Nexperia | Mouser Denmark

 

[soekris]

Søren, can you verify that these are appropriate?

74LVC595APW,112 Nexperia | Mouser Denmark

That's the right part for the dam1021.

 

[living sounds]

Søren, I have to ask again: Any progress on your SAR ADC?

 

[tiggerkater55]

hi søren,

may i kindly ask you to help me out with this problem? thanks a lot!

kind regards!

could you tell me please, which serial numbers the different revisions of the dam1021 have?

rev2 starts with ser. number xxx
rev3 ...

 

[soekris]

Søren, I have to ask again: Any progress on your SAR ADC?

No, moving slowly.

 

[soekris]

hi søren,

may i kindly ask you to help me out with this problem? thanks a lot!

kind regards!

Don't track serial numbers fully, look at the rear side, there is a PCB P/N, like 2010210X, where the X is the revision.

 

[avr300]

That's the right part for the dam1021.

Thanks Søren.

 

[Amulet1]

I have some noise problems on Left channel on dam1021 only when playing DSD256 native with firmware rev1.21. dsd128 and PCM is just fine.

When using rev1.06 it's no problem.

Is it firmware's problem or my dac's problem?

Help me please!

 

[soekris]

I have some noise problems on Left channel on dam1021 only when playing DSD256 native with firmware rev1.21. dsd128 and PCM is just fine.

When using rev1.06 it's no problem.

Is it firmware's problem or my dac's problem?

Help me please!

I'll look into it, somebody else reported the same issue, probably a firmware issue....

 

[tiggerkater55]

Don't track serial numbers fully, look at the rear side, there is a PCB P/N, like 2010210X, where the X is the revision.

thanks søren, helped,!

a question to the crowd: would i have to modify a 2nd revision board (which i wouldnt do mysef , and are there big steps up soundwise in the 5th revision as sold now?

thanks again!