Definetely appreciate you’re staying and the answers you’ve given.
Very much appreciate my dam1021 qualities every day too. Cheers
This is an amazing DIY Dac, I am proud to say that now I can just sit back and listen, thanks so much to Soekris and all contributors here at this forum. I can now turn the volume down and still hear details that were masked before.
Ok, a new firmware for the dam1021, now rev 1.21.
I have reworked the whole clocking, so hopefully the clicks are gone...
People who had problems with clicks, please try it and report back asap.
If it works fine, I will continue the work with firmware for the other boards since I'm in firmware mode....
There is a link to it on the download page on soekris.dk, or use this direct link:
http://www.soekris.dk/download/dam1021/1021full_121.skr
I have reworked the whole clocking, so hopefully the clicks are gone...
People who had problems with clicks, please try it and report back asap.
If it works fine, I will continue the work with firmware for the other boards since I'm in firmware mode....
There is a link to it on the download page on soekris.dk, or use this direct link:
http://www.soekris.dk/download/dam1021/1021full_121.skr
Updated both boards, will report if there are any new issues. (i've not had random clicks from either my i2s or spdif but have on occasion from my adc)
New firmware appears to be stable, locking to different sample rates seems very fast, played a bunch of stuff of varying rates. No pops or clicks to note, however I don't know if its just me or if both boards are tracking one another better or closer, at least more consistently, before it seemed as if it would randomly be off at times large enough to notice, but the next samplerate change it would be fine. Going to need @ynmichael's opinion on that one.
So far running fine here.
Søren, will you (eventually) publish the source of the 1.21 filters - if they differ from 1.20.
Søren, will you (eventually) publish the source of the 1.21 filters - if they differ from 1.20.
If one where to measure resistance with an ohm meter between the 2 positive pins of each channel L/R - what should the reading be?
//
//
Thanks!
The question is about resistance between:
L+ and R+ pins. OK?
But maybe also 625 ohm even if ground isn't involved?
If not powered?
//
The question is about resistance between:
L+ and R+ pins. OK?
But maybe also 625 ohm even if ground isn't involved?
If not powered?
//
Yes
I do not think so. You have the equivalent to two 625R resistors connected together via ground.
That should be around number of bits times the "back bone" resistor, so about 28x 5000R for the 1021.
As if not powered the shift registers have high impedance to ground. Respectively twice that value if you measure between L and R.
Edit:
Error: as you have per channel two back bones (pos and neg part of the ladder) you get only half of that if not powered.
Last edited:
So measuring, powered off, 60 ohm between left channel positive pin and right channel positiv pin should result in mono I suppose 🙂 ?
//
//
Yes, that value sounds not normal.
What do you measure from the pins to ground respectively to the Vref bus of the shift register (powered off of cause)?
What do you measure from the pins to ground respectively to the Vref bus of the shift register (powered off of cause)?