If enough customers ask, sure. But you have no skin in the game so I can't see a reason to do so just on your say-so.
Are you using the internal opamp for I/V?
Clearly you don't appreciate the subtlety of this particular design. The Riv isn't "easy" to adjust as it terminates the LC filter.
Less than 2%, or 0.17dB.
As said, new chips from Rochester, then still available in DIP package.
But I do not expect it to be different in SOIC.
Patrick
As said, new chips from Rochester, then still available in DIP package.
But I do not expect it to be different in SOIC.
Patrick
No need to match there then. Yet I get closer to the DS variation, so far on my measurements up to 20%.
I'm confused - are you saying you expect the variation to be an order of magnitude better than claimed in the DS? Or that only new chips have the tighter tolerance?
I'm confused - are you saying you expect the variation to be an order of magnitude better than claimed in the DS? Or that only new chips have the tighter tolerance?
Last edited:
Maybe just luck. Maybe same batch.
If you want to be 100% certain, then you'll have to go to something like AD1862.
Guaranteed current tolerance 2%, typically 1%.
Just a little more expensive.
Patrick
If you want to be 100% certain, then you'll have to go to something like AD1862.
Guaranteed current tolerance 2%, typically 1%.
Just a little more expensive.
Patrick
So far PCM58 fits the bill nicely where I want laser trimmed output current, no need for the extra expense of AD1862.
Interesting what wifey says... was it vs Celibidache?
What about dynamics, bass, mids, treble, soundstage?
Sounds like a new universum could open its doors...
What about dynamics, bass, mids, treble, soundstage?
Sounds like a new universum could open its doors...
Yes we did quite a long (for us) listening session of Marriner side by side with Celi. If Marriner hadn't beaten Celi then it wouldn't have seen the light of day. As for those terms, wifey doesn't talk using that kind of vocab, she tends to focus on more musically relevant aspects like whether the players sound like they're a team or not. In that she definitely reminds me of Celibidache (the man, not the DAC) because he listened out for that kind of thing.
Thanks for the tip. Will it work with Rpi4? to implement it do you need to configure the Rpi or is it plug and play? would you put the rpi4 and dac in the same enclosure? Henry
Last edited:
Quick answer so as not to pollute Richards thread.
*Yes I assume so as Rpi GPIO pins didn't change from 3 to 4?
*Depending on what software then you probably choose generic I2s DAC.
*Many will tell you to keep i2s lines as short as possible.. . precluding the DAC in a seperate box. This is where the i2s over hdmi as LVDS can come in as Richard mentioned. I believe i2s as a non consumer level protocol was never meant to be transmitted down cable of any length, instead all at PCB and chip level. I have short i2s connections and DAC and Rpi pretty close. No problems
*Yes I assume so as Rpi GPIO pins didn't change from 3 to 4?
*Depending on what software then you probably choose generic I2s DAC.
*Many will tell you to keep i2s lines as short as possible.. . precluding the DAC in a seperate box. This is where the i2s over hdmi as LVDS can come in as Richard mentioned. I believe i2s as a non consumer level protocol was never meant to be transmitted down cable of any length, instead all at PCB and chip level. I have short i2s connections and DAC and Rpi pretty close. No problems
I reckon it is, based on the datasheet numbers. But I haven't done a side by side listen to confirm, I gave up playing with TDA1543 many years ago. The key specs based on my understanding are the SNR numbers - TDA is 96dB and PCM, 110dB. So 5X less noise.
I hooked the marriner today and it sounds great. I use a squeeze box player and setting to Rpi Dac seems to activate the GPIO pins for IS2. I am Thinking about the isolator below, but what do you mean by relocating malarkey Jimk?
Attachments
Nice work Henry. Sorry we both have typos in there...! I meant reclocking. It's something to do with the clock on the Rpi not being of a divisible frequency for audio..or something. And also the i2s direct from Rpi are deemed noisy or jittery or something.
An Ian Canada Isolator, or Fifo, or an Allo Kali are the sorts of bits of kit to help there. And I can say first hand that they do make a difference. All needing decent power supplies of course.
An Ian Canada Isolator, or Fifo, or an Allo Kali are the sorts of bits of kit to help there. And I can say first hand that they do make a difference. All needing decent power supplies of course.
Thanks Jim. I am a novice at this, but I am not convinced. The isolator board seems to provide clean power, clock and ground. But the marriner has its own power and clock. Isolating the ground can be done with a few passive components. Perhaps isolators are for other dac applications?
By the way what music are you listening to? I was just testing again with this, it’s got a great dynamic range:
By the way what music are you listening to? I was just testing again with this, it’s got a great dynamic range: