How does smaller adjustment steps help? I mean your problem as I understand it is the actual deviation in frequency - if you get to a bad situation (bigger delta Hz), does it matter in how many steps it took to bring it there?
For clock quality in general, smaller but more often clock changes I cant see how this could be an improvement..
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For clock quality in general, smaller but more often clock changes I cant see how this could be an improvement..
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16 channels... oh wow. Is that for DIY or (semi-) professional use? What are you driving / is its intended purpose?
I'm not sure I understand your question. According to the manual there's a full wave rectifier bridge for AC/DC conversion. It increases voltage by sqrt(2) minus a couple of volts for the rectifier loss. Then I assume it is regulated down by dropping voltage over LDO's.
Most mods on the dam1021 concern the Vref. Myself I would prefer an external PSU so I can pick the amount of regulator noise and buffer capacitance myself, one of the reasons I went with the dam1121.
It is primarily for use with a large format studio mixing console.
The linear regulators I have used all have a frequency that is either fixed or can be set by a simple surrounding circuit. What is on the DAM1021 appears to drop the voltage to a level in relation to the incoming voltage.
The VREF didn't improve when I added capacitance (tried several cap types and configurations). What did provide a very noticeable improvement was additional capacitance after the the 3.3V regulator.
Just a resistor or voltage divider then? Which should be fine if placed after the power regulation circuit, I mean, that would give a more or less constant VDC so also a constant voltage drop. Or are you saying it seems to bypass the power regulator?
It gives a constant voltage drop, but not to a defined level but dependant on the incoming voltage.
You guys are not the only pathologically lazy ones. I also cannot be bothered to take a continuity tester to the dac 😀
Never wondered how those opamps are powered but in my defense they were the first parts to leave the board with one way tickets.
Looking at pics of the pcb it looks like there is indeed no regulation: raw dc seems to be powering those parts. No biggie.
Hooked up a Kali reclocker tonight. As I ordered the board last week, I was very much in doubt if that was money well spent. After all, with the FIFO-buffer slaved to the Si570 on the dam1121, could this even be audible? Was I buying into audiophoolishness?
Turns out it *is* audible and amazingly so. I wasn't expecting much and took a critical stance. But the retrieval of extra detail is immediately obvious. It makes saxophones sound more fragile, distorted guitars grittier, percussion more natural.
Stack now is RPi 3B+ > IsolatorPiII > Kali > dam1121. The RPi is fed off one DIYINHK LT3045 board; the IsolatorPiII, Kali and dam1121 digital from a separate LT3045 board that they share for "clean audio power".
In other attempts to reduce RPi jitter, I had set the RPi CPU scaling governor to "performance" and CPU and RAM frequencies to be multiples of each other like so: Archimago's Musings: MEASUREMENTS: Raspberry Pi 3 as USB Audio Streamer (with recommended CRAAP config & TIDAL/MQA arrives). This is now no longer necessary. Back to the on demand governor again without the frequency tweaks. My RPi now runs cooler while drawing less power.
In an attempt to match the 19,2 MHz clock on the RPi, also tried upsampling 44,1 to 48 kHz on the RPi using the ALSA speedrate_best plugin, but thought it sounded ever so slightly thinner with a slight metallic ring to it.
TL;DR an external reclocker in front of the dam significantly improves the sound.
Turns out it *is* audible and amazingly so. I wasn't expecting much and took a critical stance. But the retrieval of extra detail is immediately obvious. It makes saxophones sound more fragile, distorted guitars grittier, percussion more natural.
Stack now is RPi 3B+ > IsolatorPiII > Kali > dam1121. The RPi is fed off one DIYINHK LT3045 board; the IsolatorPiII, Kali and dam1121 digital from a separate LT3045 board that they share for "clean audio power".
In other attempts to reduce RPi jitter, I had set the RPi CPU scaling governor to "performance" and CPU and RAM frequencies to be multiples of each other like so: Archimago's Musings: MEASUREMENTS: Raspberry Pi 3 as USB Audio Streamer (with recommended CRAAP config & TIDAL/MQA arrives). This is now no longer necessary. Back to the on demand governor again without the frequency tweaks. My RPi now runs cooler while drawing less power.
In an attempt to match the 19,2 MHz clock on the RPi, also tried upsampling 44,1 to 48 kHz on the RPi using the ALSA speedrate_best plugin, but thought it sounded ever so slightly thinner with a slight metallic ring to it.
TL;DR an external reclocker in front of the dam significantly improves the sound.
DAC2541 in stock?
Hi Sören,
I am at a loss, sorry if this is the wrong thread...
I would like to buy a DAC2541 but don't know how else to contact you.
Hope you can at least reserve one of your famed converters for me, be they in stock now or in the near future 😉
Cheers
Hi Sören,
I am at a loss, sorry if this is the wrong thread...
I would like to buy a DAC2541 but don't know how else to contact you.
Hope you can at least reserve one of your famed converters for me, be they in stock now or in the near future 😉
Cheers
No, this is not the correct place for end-user products.... Please send an email to info@soekris.dk, if you already done that, please just email again.
Did you use the Kali 44/48MHz version or the 22/24MHz version?
From the Kali you feed LRCLK pin35, DATA pin40, BCK pin12 and Ground to the dam1121?
thanks
22/24 MHz which has lower jitter than 44/48 MHz. I only stream 44,1 kHz music now and don't see myself going any higher than 192 kHz for any length of time.
I2S pinout is correct. Unchanged from what you'd otherwise do on GPIO. Also pins 2-4-6 provide 5V-5V-GND which you can power the dam from.
I2S pinout is correct. Unchanged from what you'd otherwise do on GPIO. Also pins 2-4-6 provide 5V-5V-GND which you can power the dam from.