Completely Balanced Non - oversampling AD1865 DAC
Power Supply
Digital & Alalog
P2P (Point to point diagram)
I'm not going to make PCB because I think P2P is much better.
This is an old picture of digital board: coils are still here
|
Position |
Value |
Manufacturer |
Supplier |
|
BR101 |
5A |
Any diode bride 5A or more |
|
|
|
|
|
|
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C1, C2, C4, C9, C10 |
100μF 6.3 |
Black Gate NX |
Part ConneXion |
|
C3 |
68nF 100V |
Multicap RTX |
Part ConneXion |
|
C5, C7 |
22μF 6V3 |
Black Gate NX |
Part ConneXion |
|
C6, C8, C101, C106 |
4n7 500V |
Silver Mica |
www.newark.com |
|
C105, C107 |
68μF 350V |
Black Gate NH |
Part ConneXion |
|
C103 - C104 |
220μF 160V |
Black Gate VK |
Part ConneXion |
|
C111 |
220μF 16V |
Black Gate FK |
Part ConneXion |
|
C112, C114, C115, C117, c118 |
1000μF 25V |
Black Gate Std |
Part ConneXion |
|
C113, C116 |
1000μF 25V |
Black Gate NX |
Part ConneXion |
|
C119 |
100μF 16v |
Any |
|
|
C120 |
1μF 16v |
Any |
|
|
C121 |
23000μF 16v |
Mallory |
www.newark.com |
|
|
|
|
|
|
D102, D103 |
D302 |
Russia |
|
|
|
|
|
|
|
F101, F104, F105, F106 |
0A25 250V |
Any slow fuse |
|
|
F102 |
1A 250V |
Any slow fuse |
|
|
F103, F107 |
0A5 250V |
Any slow fuse |
|
|
|
|
|
|
|
R1 |
110ohm 0.5W |
Audio Note Tantalum |
Part ConneXion |
|
R2 |
470ohm 0.5W |
Audio Note Tantalum |
Part ConneXion |
|
R3, R4 |
220ohm 1W |
Audio Note Tantalum |
Part ConneXion |
|
R5, R6 |
2.2K 1 W |
Audio Note Tantalum |
Part ConneXion |
|
R101, R103 |
2K2 12W |
Mills MRA12 |
Part ConneXion |
|
R102, R104 |
1K 12W |
Mills MRA12 |
Part ConneXion |
|
R105, R106 |
1k5 0.75W |
Caddock MK132 |
Part ConneXion |
|
R107 |
100ohm 12W |
Mills MRA12 |
Part ConneXion |
|
R108, R109, R112, R113 |
1.5k 0.5W |
Audio Note Tantalum |
Part ConneXion |
|
R110, R111, R114, R115 |
75ohm 12W |
Mills MRA12 |
Part ConneXion |
|
R116, R117 |
220ohm 2W |
Any |
|
|
R118 |
120ohm 0,5W |
Any |
|
|
R119 |
500ohm 1W |
Any potentiometer |
|
|
|
|
|
|
|
IC1 |
CS8414-CS |
Cirrus Logic |
www.newark.com |
|
IC2 |
74HC04 |
Any |
www.newark.com |
|
IC3, IC4 |
AD1865N-J |
Analog Device |
www.newark.com |
|
IC101 - IC103 |
TL431 |
Any |
|
|
IC104 |
LM338T |
Any |
|
|
|
|
|
|
|
SB101, Sb102, SB103 |
250ohm@100MHz |
Fair-Rite |
www.newark.com |
|
|
|
|
|
|
T1 |
TRANS-280 |
Audio Note S/PIDF |
Part ConneXion |
|
T2, T3 |
Sowter 9762 |
Sowter |
www.sowter.co.uk |
|
T4, T5 |
Sowter 8650 |
Sowter |
www.sowter.co.uk |
|
T101 |
263AX |
Hammond |
www.newark.com |
|
T102, T103 |
185C24 |
Hammond |
www.newark.com |
|
T104 |
185C16 |
Hammond |
www.newark.com |
|
|
|
|
|
|
Vt1, Vt2 |
6H30Pi |
Russia |
www.tubestore.com |
|
Vt101 |
5Y3 |
|
www.tubestore.com |
DAC Q & A
Q. The S/PDIF transformer(TRANS-280) that you listed does not appear on the PartsConnexion web site. Is it available somewhere else?
A. This is correct. TRANS-280 is not listed, however they can get it as AudioNote dealer. E-mail them. As far as I remember it will take about a month and about $60.00 „£ or you can probably get TRANS-280 directly from
http://www.audionote.co.uk/
Q. My amplifier don't have balanced inputs and I don't know exactly how to incorporate them.
A. Use RCA instead XLR, YELLOW transformer wire (T4, T5) is going to be connected to the output ground (OuG) and Blue transformer wire is output now
Q.Is it possible to use an external high-precision clock with the cs8414??
A.Jitter is not an issue for nonoversampling design. It becomes very important for X8 and higher oversampling. I do not plan anything like this
Q.Could the retro dac be modified for d/a conversion of dvd-a high-rez audio (24/96 or even 24/192)??
A.There are two obstacles
1. I use only DAC chips that work as 2R-R matrix, which means it made using real resistor voltage dividers. 20-bit DAC chip is the best we can get now (AD1862). The other high-resolution 24 bit DAC chips use delta/sigma 1 bit conversion and sound much worse than 2R-R matrix chips.
2. No 24-bit signal available in SPDIF output. DVD manufacturers think if they allow high-resolution audio signal go through SPDIF a pirate can catch this bit-stream, save in computer and break the copyright this way. It gets even worse: in cheap DVD players a software made the way it gives only 16 bit /48 kHz signal even for internal DACs and then it goes to oversampling. That is how most of DVD player fooling us giving fake 24/192 signals... Even technical descriptions for DVD players made the way we do not understand what kind of output signals we really have. The only way to listen to high resolution DVD sound is to get very expensive DVD player $2000-3000 and up
Cs8414 easy synchronizes with any sampling frequency from 32 to 96 kHz, so there is no problem here.
I would like to do something like this with DVD-audio or Super-audio CD, however it is about industrial secrets I do not know. So it is just impossible now.
Q.I was amazed to read that you left away the negative supply for the differential amp. I use current sources in all my differential stages and I like them a lot. What made you leave away the much higher impedance of the negative supply and replace it with "only" 2k2? Does it really sound better this way??
A.Yes, it is sounds much better to me. When I had non-balanced input for my amp and I used cathode current source in phase splitter (http://www.oocities.org/yury_g/trunk.htm) the sound improvement was remarkable, however in completely balanced schema replacing this common cathode grounded resistor sounds much better.
I put negative supply in my DAC long ago, when I was not going to make completely balanced DAC yet. So I forgot about this place until one day I worked on my balanced vinyl preamp, which has about the same output stage as in my DAC. So I changed schema to what you see now and I got remarkable improvement. Same day I made the same changes to my amp and my DAC and I did not hesitated since.
A small tweak for Sony DVP-NS500V DVD Player
