Ok ZM,
Sound is becoming increasingly gorgeous....with every little gain in bass.....we are for sure on the right track.
I'll do the changes on the diodes by tomorrow....other duties call me today.
...The only way i can describe the sound is : very open but not tiring and with great definition...when we add the bass it lacked......WOW, a very real improvement on original.
Manu...go get that thingie you sold......BB1738 can and does sound gorgeous.
Sound is becoming increasingly gorgeous....with every little gain in bass.....we are for sure on the right track.
I'll do the changes on the diodes by tomorrow....other duties call me today.
...The only way i can describe the sound is : very open but not tiring and with great definition...when we add the bass it lacked......WOW, a very real improvement on original.
Manu...go get that thingie you sold......BB1738 can and does sound gorgeous.
CeeVee said:
I'm glad to hear this 😉
worthy crusade , I think .......
which other CDs/digisources/DACs you have for comparison ?
I have a Pedja Rojic AYAII DAC....this is what i'm using as comparison right now.
But the quality is apparent even without comparing with other equipment...i was listening to Tony Joe White....good voice, good recording, good guitars...great bass lines....and it sound just REAL.
This I/V is cleaner and more open...only lacking a bit of very low end bass now.
I should add that i have a TDA1541A S2 double crown on the DAC, which has a better top end than original TDA1541A and this thingie still sounds better....😎
But the quality is apparent even without comparing with other equipment...i was listening to Tony Joe White....good voice, good recording, good guitars...great bass lines....and it sound just REAL.
This I/V is cleaner and more open...only lacking a bit of very low end bass now.
I should add that i have a TDA1541A S2 double crown on the DAC, which has a better top end than original TDA1541A and this thingie still sounds better....😎
CeeVee said:
don't worry - we'll finish Drekling saga soon .......
then we can work a little on other things in it ... if needed .
Hi ZM,
Today's report:
changed diodes and had to raise bottom resistor, right now it's at 820R, Ub/2 is set but top pot is at it's limit, won't give more adjustment.
DAC output voltage is 2.46V Dc...almost there.
Question is, do i raise top resistor ( pot ) ? and take bottom resistor to say 1K5, i guess that is where i'll have to go to get 2.5V at DAC output.
...by the way bass is almost there but it's way more solid than the AYAII gives, better defined.
Today's report:
changed diodes and had to raise bottom resistor, right now it's at 820R, Ub/2 is set but top pot is at it's limit, won't give more adjustment.
DAC output voltage is 2.46V Dc...almost there.
Question is, do i raise top resistor ( pot ) ? and take bottom resistor to say 1K5, i guess that is where i'll have to go to get 2.5V at DAC output.
...by the way bass is almost there but it's way more solid than the AYAII gives, better defined.
CeeVee said:
now just increase bottom resistors..... then re-set ; it's better when you have more symmetry between top and bottom CCS-es setting ;
that way I presume that you'll be in ballpark ;
you already are , anyway ....... 2,46 is pretty close to 2,5 ...... isn't it 😉
if you need to feedle with gain , change output resistors , nothing else !
if you are "almost there" with bass , but you already have needed definition , than is time to implement better supply for your I/V .
that will give you that last missing part of bass , both bottom and definition .
I presume that overall sound didn't change to worse ?
Hi ZM,
No quite the contrary ...i'm in trance...just been listening to latest offering from Snowy White and it sends shivers up my spine..brrrrr so so real.
One issue you did not address, on one of the top pots i cannot quite adjust to Ub/2 because the pot is at end of travel ( 200R ).
Should/ can i raise this value to say 300R ? to get Ub/2.
It's almost there ( 7.56V ) but i cannot get to 7.5.
By the way i still have those SilmicII caps ( 47u) as coupling caps, ill put in the 10u sonicaps tomorrow, that should also help.
As for the Supply i was expecting you to say that, I'm using the op-amp supply on the Shanling DAC-board.....you suggesting Shinyy ?
😉
No quite the contrary ...i'm in trance...just been listening to latest offering from Snowy White and it sends shivers up my spine..brrrrr so so real.
One issue you did not address, on one of the top pots i cannot quite adjust to Ub/2 because the pot is at end of travel ( 200R ).
Should/ can i raise this value to say 300R ? to get Ub/2.
It's almost there ( 7.56V ) but i cannot get to 7.5.
By the way i still have those SilmicII caps ( 47u) as coupling caps, ill put in the 10u sonicaps tomorrow, that should also help.
As for the Supply i was expecting you to say that, I'm using the op-amp supply on the Shanling DAC-board.....you suggesting Shinyy ?
😉
CeeVee said:
naah ...... just leave it as is ; it's good enough ;
having Ub/2 is just to be sure that you'll have symmetrical clipping , and you are near enough ;
nope Shinyy - it's symmetric ; you need something as Shiny - just positive supply ; or newest Steen's pet I mean that's Tool Reg ;
whatever you find more convenient , regarding pcb size ;
just listen few days , and we'll maybe try to recalc few values to increase overall current through stage ....... that way it will sing even better
edit :
is output voltage comparable with Drekling in origigi shape ?
Zen Mod said:
Yep... pretty close, that is why i lowered output I/V resistor to 1k5.
I'll listen till Saturday evening....then I'm off to work a week in the Azores ...ATC center there.
So I'll have time to polish "final" PCB design for your appraisal.
By that time i should know what supply to use....space is not a problem...box is huge, but then i don't need a monster, each channel is drawing a little over 200mA.
CeeVee said:
you mean little over 100mA/ channel ?
each leg ~50mA , and middle string ~1mA ?
edit :
in sam etime when you edited your post , I made few quick calcs ........ we don't need more current through stage 😉
CeeVee said:...ooops sorry, that's 28.2 mA both channels, didn't see the dot on my auto ranging DMM
ok 😉
now I'm going to sleep .......
prepare me for tomorrow exact schematic with exact resistor (including pots) values , and voltage values on every transistor E,C,B
good night ..........
........preparing trip, no time for hobby...
maybe later today i'll do a little bit more.
I'm going to post final PCB of course, all files and the schematic details you asked for as well.
I asked Manu for the latest Toole reg PCB files...he's very busy as well but i'll get them when he can so I'll have decent clean supply for the thingie.
One thing i did try yesterday, i raised the value of bottom resistor to 1k5 and DAC voltage output went up to 2.48V....but i cannot get Ub/2 without raising top resistor/ pot value ( is this desirable ?) ...i get near 8Vdc at output...from a 15V supply , this should not be serious because i should not clip the signal......but it seems i do because there is a lot of midband distortion and Bass is essentially gone.
...back to 820R and gorgeous sound.....even if still lacking a bit on the bass.
I did not check the HF noise as you asked because i don't have an osciloscope at home...been thinking about getting a soft one for the lap-top....do you have a sugestion for this ?
😎
maybe later today i'll do a little bit more.
I'm going to post final PCB of course, all files and the schematic details you asked for as well.
I asked Manu for the latest Toole reg PCB files...he's very busy as well but i'll get them when he can so I'll have decent clean supply for the thingie.
One thing i did try yesterday, i raised the value of bottom resistor to 1k5 and DAC voltage output went up to 2.48V....but i cannot get Ub/2 without raising top resistor/ pot value ( is this desirable ?) ...i get near 8Vdc at output...from a 15V supply , this should not be serious because i should not clip the signal......but it seems i do because there is a lot of midband distortion and Bass is essentially gone.
...back to 820R and gorgeous sound.....even if still lacking a bit on the bass.
I did not check the HF noise as you asked because i don't have an osciloscope at home...been thinking about getting a soft one for the lap-top....do you have a sugestion for this ?
😎
CeeVee said:
I always forgot to ask - which sort of Himmelwakoo you are
?anyway - do not hurry because of me ..... real life always have priority ... even if my Yoda Manu and I always think that real life is this one - passion related part
I asked for exact schematic and voltages , just to be able to verify few things , and maybe still correct something ; I'm not familiar with sims ....... never enough time ..... so I need these , for thinking and calculating 😉
in a meantime - put 10E+2200uF in front of each I/V channel , in PSU line ; 10E in series , 2200uF from + to gnd , after 10E ..... of course
nope ....... I have just "real" one ...... still no need for software thingy
maybe one day I'll buy some usb superduper scope thinhy , but not yet ....
my intention is that we can implement pot+elco instead one led , in biasing string ;
that way , we can set entire gadget pretty easy ......
....I wish i could dedicate more time to this but i have Air Traffic Control Engineering stuff to do.
I stopped my audio hobby about 15 years ago...put it on hold until a year or so back, when i started building the Orions and UGS ( bug was only dormant not dead ...hehe ).
In those intervening years lost track of a lot of knowledge.....did mostly digital and software.....plus management , this last one really made me forget a lot.
....but there's hope...i'm back to re-learn the lot....and more.
I'll take up your suggestions, got a week in the middle of the Atlantic to think and plan......
...you get older...you get wiser...hopefully and you start realizing passions are more important.....this is one of them!😎
I stopped my audio hobby about 15 years ago...put it on hold until a year or so back, when i started building the Orions and UGS ( bug was only dormant not dead ...hehe ).
In those intervening years lost track of a lot of knowledge.....did mostly digital and software.....plus management , this last one really made me forget a lot.
....but there's hope...i'm back to re-learn the lot....and more.
I'll take up your suggestions, got a week in the middle of the Atlantic to think and plan......
...you get older...you get wiser...hopefully and you start realizing passions are more important.....this is one of them!😎
You guys are having a ball overhere🙂 Great thread.
These should be good: http://www.tiepie.com/uk/products/External_Instruments/USB_Oscilloscope/Handyscope_HS3.html
BTW Take good care of my pet😀 The compact V4.1 is just the right size for this use.
🙂
CeeVee said:
These should be good: http://www.tiepie.com/uk/products/External_Instruments/USB_Oscilloscope/Handyscope_HS3.html
BTW Take good care of my pet😀 The compact V4.1 is just the right size for this use.
🙂
steenoe said:
yeah ...... seems two man party .......
( without counting Manu , as sole cheerleader girl )- Status
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