Spencer
I can recommend to try to increase values and types of caps at pins 1, 3, 4
you have 12uF now - I have been informed that that values might be 1000uF - which gives Improvement at mid range - try It with at lease 100uF at pin 1
you can read http://www.diyaudio.com/forums/digital-source/119411-pcm63-dac-mods.html
how about shunt regs to power analog pins of pcm63
I can recommend to try to increase values and types of caps at pins 1, 3, 4
you have 12uF now - I have been informed that that values might be 1000uF - which gives Improvement at mid range - try It with at lease 100uF at pin 1
you can read http://www.diyaudio.com/forums/digital-source/119411-pcm63-dac-mods.html
how about shunt regs to power analog pins of pcm63
Samoloko,
The type of cap at pin 1, 3 and 4 is more important than the value. Different cap type will give you very different sonic signature. Choose the one you like most. I have no specific value to recommend but I think 47u is a good value to use.
The supply, the decouple cap type, the value, the IV design and other component use will add up to a final spectrum content which will be very different. My experience is that it take some time to tune the sound to get what you want.
The type of cap at pin 1, 3 and 4 is more important than the value. Different cap type will give you very different sonic signature. Choose the one you like most. I have no specific value to recommend but I think 47u is a good value to use.
The supply, the decouple cap type, the value, the IV design and other component use will add up to a final spectrum content which will be very different. My experience is that it take some time to tune the sound to get what you want.
Hi Spencer,
Will you try pcm63p in piggy back mode when you have time?
http://www.diyaudio.com/forums/digital-source/51032-pcm63pk-piggy-back-mode-6.html
Will you try pcm63p in piggy back mode when you have time?
http://www.diyaudio.com/forums/digital-source/51032-pcm63pk-piggy-back-mode-6.html
1. SM5840 is a very old chip with much poor spec than SM5842. Example is 20 bit only and stop band att is around 55db. 5842 is 24 bit and >117db stop bank att. I have no experience on 5840 but my best guess is that 5840 is a low grade DF chip.
2. I have used jfet IV for TDA1541 here: FET Audio TDA1541 SZ DAC
3. To me TDA1541 is still not as good as 20 bit PCM63 and the difference is very much, not marginal.
2. I have used jfet IV for TDA1541 here: FET Audio TDA1541 SZ DAC
3. To me TDA1541 is still not as good as 20 bit PCM63 and the difference is very much, not marginal.
Spencer
have you tried this http://www.diyaudio.com/forums/pass-labs/34191-i-u-stage-d1-clone-2sk389-finetuned.html
have you tried this http://www.diyaudio.com/forums/pass-labs/34191-i-u-stage-d1-clone-2sk389-finetuned.html
thats why asking
I build It and It Is a step ahead from original
at now I use SE not balanced
I just wanted to know If you have compared - but It seems no
one question - at the beginning of your I/V stage design you have different supply voltages - 24Vdc
now you have lowered to 20 Vdc - Is this sweet pot - also what Is bias current of your design
does your last dac design use balanced reclocking
I build It and It Is a step ahead from original
at now I use SE not balanced
I just wanted to know If you have compared - but It seems no
one question - at the beginning of your I/V stage design you have different supply voltages - 24Vdc
now you have lowered to 20 Vdc - Is this sweet pot - also what Is bias current of your design
does your last dac design use balanced reclocking
This picture show I have tried the original D1 IV in a CD player.
I think the first K170 jfet IV is a bit better but after I use the K369 in parallel, it is a step forward due to double gain of the jfets - 40mS.
The bias is about 8 to 10mA for the final jfet IV and thus I need to use two in parallel due to heat issue. Lower supply voltage is to ensure not over heat the jfets.
I do not use any reclocking in my design yet. I think a ASRC chip will do all the job of reclocking.
I think the first K170 jfet IV is a bit better but after I use the K369 in parallel, it is a step forward due to double gain of the jfets - 40mS.
The bias is about 8 to 10mA for the final jfet IV and thus I need to use two in parallel due to heat issue. Lower supply voltage is to ensure not over heat the jfets.
I do not use any reclocking in my design yet. I think a ASRC chip will do all the job of reclocking.
Attachments
To close the sales of D1V33, I would like to announce where I can find those PCM63 chip especially KY and Y version from Yamaha proaudio equipment.
Model - chip per set
D2040 - 8 pcs Y
DA8X - 8 pcs either KY or Y (mostly KY)
DEQ5 - 2 pcs Y
DEQ5E - 2 pcs Y
ProR3 - 2 pcs J
YDP2006 - 2 pcs K
YDG2030 - 2 pcs K
DA2X - TDA1547 x 2 pcs.
Good luck for your equipment search! Spencer
Model - chip per set
D2040 - 8 pcs Y
DA8X - 8 pcs either KY or Y (mostly KY)
DEQ5 - 2 pcs Y
DEQ5E - 2 pcs Y
ProR3 - 2 pcs J
YDP2006 - 2 pcs K
YDG2030 - 2 pcs K
DA2X - TDA1547 x 2 pcs.
Good luck for your equipment search! Spencer