Hi Shane (Sceglar),
Very thanks for your advise about USB implementation.
I added your deeply advise into the coming DAC already .
I did already, very thanks.
thx
thomas
Very thanks for your advise about USB implementation.
I added your deeply advise into the coming DAC already .
I did already, very thanks.
thx
thomas
Thomas, if you can, please answer this question. Maybe you didn't see my first post. What is the difference between the version 2 and 3 of your DAC? When will the version 3 be available? My last try before I give up.
Member
Joined 2002
Maybe thomas has diyaudio in his spam. ? I have been trying to email him also and gotten no responses. 🙁
Yea jleaman, not sure why Thomas chooses to answer some questions but entirely ignores others. It seems like some customers are having problems getting a response from him. Not good for those who are thinking about buying his DAC.
Member
Joined 2002
I could not agree more.!hi MGH & Jleaman,
Hi,
I will not ignore questions & not answer.
For example. some of the diyers told me that the tbe buffer ad hum & some are not. At last I found was the PCB had small hair like copper connect together. But I don't know this will be same in all PCB or not.
so I told them pls try to found the small mistake, if not. Pls wait a little bit. I was prepare the new tube buffer. I will change another factory & after that I will post U a new oneor U can choose the new design PCB which I prepare for ver.3 ( coming). Ver.4 ( for testing purpose because full balance but I was afraid the matching of chips)
MGH, do U email to me. I hadn't received your emails.
can u told me your email again.
I will email to admin of the diyaudio.com to check my email again.
if some email not call back i will check & return immediately.
Jleaman, U too.
MGH, regard your questions. U ask me ver.2 & 3 any different. yes, it had different.
At least some of the pcb of ver.2
the main different was ver.3 will use back one 1541a chips.
many diyers told me the matching of the chips was important in the parallel DAC.
Also, consolidate the comment, looks back to single chip will be easy to funish with better performance.
I choose a new, modern 1541a DAC. it marantz project D-1 to reference. project D-1 not use op-amp to output stage. They use transistor for it. I also love this design but I hope diyers can adj their sound by change op-amp.
More extend space of the ver.3.
1. Can added USD 2.0 receiver to the DAC.
2. standard use two op-amp per channel.
but can added one tube buffer ( funish already with EC900.)( Hytron made in Germany SQ series) tube use cathode output stage to lower the output impedence.
3. Can added 20K:600 pre-amp OPT to the DAC.
tube was running in 7~8ma per one.
pls see some photos of the ver.3.
thx
thomas
Hi,
I will not ignore questions & not answer.
For example. some of the diyers told me that the tbe buffer ad hum & some are not. At last I found was the PCB had small hair like copper connect together. But I don't know this will be same in all PCB or not.
so I told them pls try to found the small mistake, if not. Pls wait a little bit. I was prepare the new tube buffer. I will change another factory & after that I will post U a new oneor U can choose the new design PCB which I prepare for ver.3 ( coming). Ver.4 ( for testing purpose because full balance but I was afraid the matching of chips)
MGH, do U email to me. I hadn't received your emails.
can u told me your email again.
I will email to admin of the diyaudio.com to check my email again.
if some email not call back i will check & return immediately.
Jleaman, U too.
MGH, regard your questions. U ask me ver.2 & 3 any different. yes, it had different.
At least some of the pcb of ver.2
the main different was ver.3 will use back one 1541a chips.
many diyers told me the matching of the chips was important in the parallel DAC.
Also, consolidate the comment, looks back to single chip will be easy to funish with better performance.
I choose a new, modern 1541a DAC. it marantz project D-1 to reference. project D-1 not use op-amp to output stage. They use transistor for it. I also love this design but I hope diyers can adj their sound by change op-amp.
More extend space of the ver.3.
1. Can added USD 2.0 receiver to the DAC.
2. standard use two op-amp per channel.
but can added one tube buffer ( funish already with EC900.)( Hytron made in Germany SQ series) tube use cathode output stage to lower the output impedence.
3. Can added 20K:600 pre-amp OPT to the DAC.
tube was running in 7~8ma per one.
pls see some photos of the ver.3.
thx
thomas
Attachments
more reference data.
http://www.net-audio.co.uk/tda1541nos.html
I forgot to say that the version 3 wil supply CS8414 or CS8412-IS grade for diyers.
IS grade was industrial grade more stable in high temp effect.
thx
thomas
http://www.net-audio.co.uk/tda1541nos.html
I forgot to say that the version 3 wil supply CS8414 or CS8412-IS grade for diyers.
IS grade was industrial grade more stable in high temp effect.
thx
thomas
Thanks Thomas for the reply. I'm a little confused. Does version 3 only use one TDA1541 or more than two?
hi MGH,
one pc only.
since I cannot collect more amount of chips for close matching.
Although I can, some of the members still told me there still had some unknown problems, dynamc was increase but detail was lost. Dynamic increase due to double of current running of two chips. But loss detail also very important.
I had two photos of the Marantz DA96, use S1 selected grade chips & studer 737 CD players. Pls detail to check. Also use 1541a + SAA7220 P/B.
thx
thomas
one pc only.
since I cannot collect more amount of chips for close matching.
Although I can, some of the members still told me there still had some unknown problems, dynamc was increase but detail was lost. Dynamic increase due to double of current running of two chips. But loss detail also very important.
I had two photos of the Marantz DA96, use S1 selected grade chips & studer 737 CD players. Pls detail to check. Also use 1541a + SAA7220 P/B.
thx
thomas
Attachments
Actually, I just bypassed a SAA7220P from a tda1541 S1 dac I had last week, not Thomas's dac but a Joe Curcio CD12V, and thought the bass/mids were much better but I did notice a drop in the highs. What highs where left were clearer though. Can either your v2 or 3 dac's output stage be tailored to offset the roll off in non oversampling mode so it has a flat response? To me this would address non oversampling's weakness and leave one with great sound🙂. Thanks.
Hi defec,
do U care to discuss our both opinions about the weakness of the 1541a sound stage ( NOS or not).
A small opinions that I heard in NOS or mix with SAA7220.
A little weak sound stage which compare with the moderen 20 or 24bits DAC. Detail can improve by change several improvment.
1. decoupling caps, at least change MKP or tantalum caps to increase the slew rate or said ( discharge & charge rate ). Standard caps use in vintage 1541a machine most was MKT caps 0.22uf.
2. lower the power supply internal resistance. Most design as my previous one! Use a large caps after the diode will effect the clearity of the sound stage. I try to improve & parallel a small MKP caps ( 0.01~0.1) to lower the HF resistance., yes its improve. but not too much. The best method I choose was paralell several size caps ( 1000uf= 700+220+100+10+0.1(MKP). This method can improve 1541a weakness but will not loss the smooth of the MF. During testing for the improvment of the power internal resistance, I try the NIPPON CHEMI-CON LXZ series already. LXZ / 105¢J Lowest impedance, downsize, 5000 hrs. Bu the sound quality still best parallel by several middle to small caps.
3. release the TL431 & use zener to lock the voltage.
4. if use the tube buffer pls choose UHF tube had better HF or connect a pre-amp OPT which had higher pri impedence. When I test for the buffer output stage. Connect to 5K:600 was better than 3K:600 or capacitors output. worse was output voltage was less.
Use high impedence will most linear the sound & bass will control better!
5. tube Output caps change from 0.47uf to parallel 0.22uf X2 or added one small 0.01uf caps. same method to lower the internal resistance. This will increase more HF, or change a lower value caps.
6. Why I suggest added SAA7220P/B, P/A P/B & P/C I also test already.ACtually P/B is the best.Use reclock circuit can compensate the HF, sorry its compensate, not improve. If U like fundamentally to call back the HF. Looks added the SAA7220P/B will one of the best way for 1541a. I understand still more people love NOS-DAC, so I provide a set up can disable or enable the saa7220.
7. Don't use the capacitors or normally magnet powder pulse transformers for data input. Try amorphous. Actually Nano will be the best. Last time compare with different brand which use permally core with silver wire still not better than nano amorphous.
8. accurate of the decoupling caps of the 1541a. looks matching this caps will effect the clearity of the sound stage. I will not use a copper foil to shield the decoupling caps but U will see every caps was close match in two decimal place in ver.3.
9. ver.2 still can upgrade by added a pre-amp OPT. I will prepare a 5K:600ohm for them. only collect back the basic price.
The pre-OPT was winding by two bobbins, I thought most people will know use two bobbin will better. Example,
turn ratio of 10K:600ohm.
turn ratio was 1: 0.245.
It means 10V input will only had 2.45V output!!!!
Use two Bobbin why can lower the no of turns???
Do U remember the choke 2.5H series connect to 2.5H =10H.
2.5H parallel to 2.5H =2.5H but the current will double.For dac not need large current, large pri impedence will most linear.
So t means if eed to prepare the 10K pre-amp output I only need to prepare two bobbin which had 2.5K:600ohm. Do U understand? Every Half of the Bobbin was same 2.5K: 600ohm, balance winding. series connect the pri. will had 10K impedence. Parallelthe sec had 600ohm.If U like to more dynamic. series the sec. will change to 10K:2.4K. Trun atio change to 1: 0.475.
Hope u will understand. Use a transformers couple will more stable than the caps output. But the band width is very important.I will prepare the test report to forum.
10. tube buffer use cathode output stage can increase the dynamic, loading with the transformers will more linear & stable.
11. bridge rectifier diode must -must -must parallel to use. The dynamic will increase, also lower the power supply internal resistance.
thx
thomas
defec, pls try some opinions that I discover & try to your dac.
thx
thomas
do U care to discuss our both opinions about the weakness of the 1541a sound stage ( NOS or not).
A small opinions that I heard in NOS or mix with SAA7220.
A little weak sound stage which compare with the moderen 20 or 24bits DAC. Detail can improve by change several improvment.
1. decoupling caps, at least change MKP or tantalum caps to increase the slew rate or said ( discharge & charge rate ). Standard caps use in vintage 1541a machine most was MKT caps 0.22uf.
2. lower the power supply internal resistance. Most design as my previous one! Use a large caps after the diode will effect the clearity of the sound stage. I try to improve & parallel a small MKP caps ( 0.01~0.1) to lower the HF resistance., yes its improve. but not too much. The best method I choose was paralell several size caps ( 1000uf= 700+220+100+10+0.1(MKP). This method can improve 1541a weakness but will not loss the smooth of the MF. During testing for the improvment of the power internal resistance, I try the NIPPON CHEMI-CON LXZ series already. LXZ / 105¢J Lowest impedance, downsize, 5000 hrs. Bu the sound quality still best parallel by several middle to small caps.
3. release the TL431 & use zener to lock the voltage.
4. if use the tube buffer pls choose UHF tube had better HF or connect a pre-amp OPT which had higher pri impedence. When I test for the buffer output stage. Connect to 5K:600 was better than 3K:600 or capacitors output. worse was output voltage was less.
Use high impedence will most linear the sound & bass will control better!
5. tube Output caps change from 0.47uf to parallel 0.22uf X2 or added one small 0.01uf caps. same method to lower the internal resistance. This will increase more HF, or change a lower value caps.
6. Why I suggest added SAA7220P/B, P/A P/B & P/C I also test already.ACtually P/B is the best.Use reclock circuit can compensate the HF, sorry its compensate, not improve. If U like fundamentally to call back the HF. Looks added the SAA7220P/B will one of the best way for 1541a. I understand still more people love NOS-DAC, so I provide a set up can disable or enable the saa7220.
7. Don't use the capacitors or normally magnet powder pulse transformers for data input. Try amorphous. Actually Nano will be the best. Last time compare with different brand which use permally core with silver wire still not better than nano amorphous.
8. accurate of the decoupling caps of the 1541a. looks matching this caps will effect the clearity of the sound stage. I will not use a copper foil to shield the decoupling caps but U will see every caps was close match in two decimal place in ver.3.
9. ver.2 still can upgrade by added a pre-amp OPT. I will prepare a 5K:600ohm for them. only collect back the basic price.
The pre-OPT was winding by two bobbins, I thought most people will know use two bobbin will better. Example,
turn ratio of 10K:600ohm.
turn ratio was 1: 0.245.
It means 10V input will only had 2.45V output!!!!
Use two Bobbin why can lower the no of turns???
Do U remember the choke 2.5H series connect to 2.5H =10H.
2.5H parallel to 2.5H =2.5H but the current will double.For dac not need large current, large pri impedence will most linear.
So t means if eed to prepare the 10K pre-amp output I only need to prepare two bobbin which had 2.5K:600ohm. Do U understand? Every Half of the Bobbin was same 2.5K: 600ohm, balance winding. series connect the pri. will had 10K impedence. Parallelthe sec had 600ohm.If U like to more dynamic. series the sec. will change to 10K:2.4K. Trun atio change to 1: 0.475.
Hope u will understand. Use a transformers couple will more stable than the caps output. But the band width is very important.I will prepare the test report to forum.
10. tube buffer use cathode output stage can increase the dynamic, loading with the transformers will more linear & stable.
11. bridge rectifier diode must -must -must parallel to use. The dynamic will increase, also lower the power supply internal resistance.
thx
thomas
defec, pls try some opinions that I discover & try to your dac.
thx
thomas
Member
Joined 2002
Hi jleaman, when will U SEND e the PM. I still not received???
I guess I mst check any spam of my email box.
thx
thomas
I guess I mst check any spam of my email box.
thx
thomas
- Status
- Not open for further replies.