Hello,
U25 removed:
Tp1=19,25V
Tp2=10,1V
Tp3=20,5V
Tp4=2,5V
Tp5=5,3V
Tp6=2,17
Tp7=*****20,5V
Tp8=10,1V
Tp5 is 5,3V instead of 5.0V on the soldering guide. The otherTp voltage seems to be correct
Psu=24V 83mA
What do you think about?
Thanks
Guglielmo
U25 removed:
Tp1=19,25V
Tp2=10,1V
Tp3=20,5V
Tp4=2,5V
Tp5=5,3V
Tp6=2,17
Tp7=*****20,5V
Tp8=10,1V
Tp5 is 5,3V instead of 5.0V on the soldering guide. The otherTp voltage seems to be correct
Psu=24V 83mA
What do you think about?
Thanks
Guglielmo
At last, TP2 is correct 🙂
I wonder if there is some damage to the DAC power supply circuit which is why TP5 is too high. Please check the voltage on base of Q11 and Q12. Also voltage across D2 (3.9V zener). The rest of the measurements, including the current draw are encouraging. TP7 won't be correct because of the missing opamp.
I wonder if there is some damage to the DAC power supply circuit which is why TP5 is too high. Please check the voltage on base of Q11 and Q12. Also voltage across D2 (3.9V zener). The rest of the measurements, including the current draw are encouraging. TP7 won't be correct because of the missing opamp.
That is looking as if Q11 (BC846B) got broken as VbQ12 should be about 5.6V. Do you have anything to replace it?
Can't see any problems there, you now've got the DAC supply within spec. You'd be able to get music to play from one channel I reckon. Beyond that you'll need a replacement LT1028 to bring the remaining channel to life.
I just have to say ...contemplating a Kubelik build and hankering after a Celibidache, I've been reading through the threads again and came across the link to the interview with the Maestro.....wow.....what a mind, intellect, artist....ad infinitum. His vocabulary ( and I'm English) and use of words is incredible.... fascinating....if not a little lost on this meagre brain.
Hello,
I replaced the LT1028. Now everything seems ok, all the TP of Step 2 are correct and the PSU is 24V 105mA.
Seems correct, can I proceed to Step 3?
Thanks for your great help.
Guglielmo
I replaced the LT1028. Now everything seems ok, all the TP of Step 2 are correct and the PSU is 24V 105mA.
Seems correct, can I proceed to Step 3?
Thanks for your great help.
Guglielmo
Hello Richard,
Celibidache is singing in my system, a big step up from the Decadac 1. It sounds different than I expected, it doesn't stand out but there is a lot of music and a lot of rhythm. I like it very much. As an input card I had one with an AK4137 that allows me to bring the sampling frequency to a fixed value of 44.1KHZ (settable) also allows you to set 4 different types of digital filter. Now I have to try and listen.
At this point the usual question: are there any parts in this dac that could be upgraded to a better quality to squeeze some more juice?
Thanks for your work and your patience.
Celibidache is singing in my system, a big step up from the Decadac 1. It sounds different than I expected, it doesn't stand out but there is a lot of music and a lot of rhythm. I like it very much. As an input card I had one with an AK4137 that allows me to bring the sampling frequency to a fixed value of 44.1KHZ (settable) also allows you to set 4 different types of digital filter. Now I have to try and listen.
At this point the usual question: are there any parts in this dac that could be upgraded to a better quality to squeeze some more juice?
Thanks for your work and your patience.
Attachments
That is excellent news Guglielmo, thanks for sharing. I will have a think about upgrades and get back to you.
After I have broken twice my D90SE, i finally got it back and now is on the system. I have connected both USB, one to celibi and one to D90SE. Ok let's have some first impressions. I use my designs in everything else but source and DACs. This is my subjective review, in my room, in my system. If you want objective reviews go to ASR. PS, i don't believe in blind tests.
1. I tried the D90SE with XLRs now, since I have just finished my preamp that has symmetric input. I also decided to have it at -03.0db, i used to have it at -8.0. BAM. At last really good sound from this DAC. There is still something cold about this DAC but this time not so much and it compensates with excellent detail and beautiful voices. XLR connections gave it speed now, it is not dead meat any more.
2. Abraxalito, you sir, have created a beautiful DAC at an affordable price. You do understand however that with no XLR, you are not in just place. Anyway. What I love with your DAC is instruments placement. It is more robust, more exact than any other DAC ever tried. Amazing, when I play yours, I smile again and again watching the exact placement of instruments. Second thing I love is the smoothness of the sound. Your DAC mate is true silk. This DAC gives me pleasure and will be on the system for certain listening. The last thing I noticed, is that there are certain "details" that seem clearer than when played through your DAC than D90SE. I think these are in the lower highs range. In higher highs the D90SE shines.
3. Dynamics and body is better in D90SE. Bass is more in D90SE, which has the best bass extend and control that any other DAC tested.
4. Celibi really likes high res audio, pity I couldn't go more than 192KHz.
5. In my system coaxials sound better than USB (of course upto 192KHz, coaxs cannot give more)
That's all for now, I have to live more with them to have better judgment.
Bear in mind that gap between the two is not that much and I cannot guarantee any same or similar behavior in YOUR system.
1. I tried the D90SE with XLRs now, since I have just finished my preamp that has symmetric input. I also decided to have it at -03.0db, i used to have it at -8.0. BAM. At last really good sound from this DAC. There is still something cold about this DAC but this time not so much and it compensates with excellent detail and beautiful voices. XLR connections gave it speed now, it is not dead meat any more.
2. Abraxalito, you sir, have created a beautiful DAC at an affordable price. You do understand however that with no XLR, you are not in just place. Anyway. What I love with your DAC is instruments placement. It is more robust, more exact than any other DAC ever tried. Amazing, when I play yours, I smile again and again watching the exact placement of instruments. Second thing I love is the smoothness of the sound. Your DAC mate is true silk. This DAC gives me pleasure and will be on the system for certain listening. The last thing I noticed, is that there are certain "details" that seem clearer than when played through your DAC than D90SE. I think these are in the lower highs range. In higher highs the D90SE shines.
3. Dynamics and body is better in D90SE. Bass is more in D90SE, which has the best bass extend and control that any other DAC tested.
4. Celibi really likes high res audio, pity I couldn't go more than 192KHz.
5. In my system coaxials sound better than USB (of course upto 192KHz, coaxs cannot give more)
That's all for now, I have to live more with them to have better judgment.
Bear in mind that gap between the two is not that much and I cannot guarantee any same or similar behavior in YOUR system.
Many thanks for sharing all this!
Question... wondering about the bass delivery... out of curiosity, what preamp did you use (if any in the case of D90SE), what volume control device and perhaps most importantly what input impedance did each DAC see?
I understood you used RCA vs XLR and that input and output impedance are of course also affected by that, just wondering if there is more than just "that"... or if Celibidace is indeed on the low side re bass and dynamics.
Thanks again for these interesting findings
Claude
Question... wondering about the bass delivery... out of curiosity, what preamp did you use (if any in the case of D90SE), what volume control device and perhaps most importantly what input impedance did each DAC see?
I understood you used RCA vs XLR and that input and output impedance are of course also affected by that, just wondering if there is more than just "that"... or if Celibidace is indeed on the low side re bass and dynamics.
Thanks again for these interesting findings
Claude
@alexopth1512 Let me add my thanks to @ClaudeG's for your very detailed feedback. Its very helpful, much appreciated!
So you're saying I would be better placed if Celibidache had balanced output? I do have a PCB (as yet unbuilt) of a balanced version for Celi but was keeping it in the wings until I had a digital splitter circuit to offer. The I2S splitter is on the way now, should be here within a week. Balanced Celi uses passive I/V rather than active, that has a small impact on how it sounds.
So you're saying I would be better placed if Celibidache had balanced output? I do have a PCB (as yet unbuilt) of a balanced version for Celi but was keeping it in the wings until I had a digital splitter circuit to offer. The I2S splitter is on the way now, should be here within a week. Balanced Celi uses passive I/V rather than active, that has a small impact on how it sounds.
Preamp is my diy. Input is 47k. Volume control is ALPS blue RK27 motorized. I am not sure if bass is weak on Celibi, I know that D90SE has the most impressive one than all DACs tested.
@abraxalito, yes it seems that XLR sounds better than RCA inputs.