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

[Gromushka]

Code updated and released.
Addition functionality + several bug fixes.
Stable version 1.0.8

https://github.com/Gromush/adac

 

[Gromushka]

Added additional functionality:

https://www.facebook.com/video.php?v=1161026978099225

 

[Dimdim]

Cute!

How did you go about doing it? Are you sampling the analog outputs or analyzing the I2S going into the DAC?

 

[Gromushka]

How did you go about doing it? Are you sampling the analog outputs or analyzing the I2S going into the DAC?

I'm using RAW outputs to connect to the amplifier, then buffered outputs connected via diodes to analog Arduino nano inputs.
Inside I have put function to analyze voltage out and just simple code to simulate out level to the 15 points as a custom line symbols.

 

[Martinljn]

Is this the correct way to wire an LED

 

[Gromushka]

Indicators update with additional view options like slowly max value downgrade like vintage indicators was.

 

[living sounds]

Hey Soeren,

how far have you come regarding the promised update of the DAM's clocking algorithm? A firmware update that would allow for stopping the clock after X cycles following a change of sample rate would suffice for me.

Thanks!

 

[atohmdiy]

Hello,
I want to build the new rev7. I want use an arduino with the ardam lite code to control it. I have a few (dumb) questions but i want to be sure.
The isolated side on J3 is well, isolated, so why Dimdim is using an isolator after it's arduino. Why not directly plug the arduino in the isolated RXD / TXD ? I feel like i am missing something here.
Also the serial connection in J10 is doing the same thing as J3 expect it's not isolated, right ? We can use both to communicate with uManagaer ?

 

[TNT]

1021 product page say " oversampling up to 3.072 Mhz" but filter file for rev7 say 1,5M.

Sören, why was FIR2 halved to 1,5MHz?

I suppose filters now need to be 2 times steeper to have the same attenuation at Fs/2 as rev6?

//

 

[living sounds]

@soekris - Soeren, have you abandoned your customers? Last post made in october...

 

[soekris]

No, but not much happening here that needs a response from me

 

[TNT]

You could answer my question 3 posts above please while you are here?

//

 

[living sounds]

And maybe mine 6 posts above?

 

[living sounds]

Soeren?

 

[TNT]

I think we both have saturated the per customer available support budget ;-) being blunt about some facts probably haven't helped either... ;-D

//

 

[atohmdiy]

Customer support is a thing... i try to order two 1021 board and i don't get answer to my email.

 

[TNT]

In a healthy business, customer support comes ahead of new sales. If no support is needed, sales can flourish.

It's this kind of posts that render me no answers to my questions :-=

HNY!!

//

 

[Hisma]

Hi soren,

I recently placed an order for a dam1021-12 from modhouse, which leads me to believe that I will receive a rev7. One of the things you mention is that now it only accepts DC in, and the optimal voltage is +/- 9V. But I didn't realize this bullet point until later, and was following damdams build guide, which he used a ultrabib shunt regulator with +/-12V output.
So me trying to follow his build, I procured parts to build a ultrabib supply with +/-12V output at around 300mA.
How will feeding in the 12VDC vs the 9VDC impact the sound quality, if at all? And just curious as to why 9V specifically is considered the sweet spot.

Appreciate any feedback on this.
Thank you

 

[soekris]

Less heat dissipated.... Don't affect sound quality.

 

[Hisma]

Perfect. Thanks for the response!