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DAC-END The best DAC AD1865- UPDAT 2011

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quanghao

quanghao

Member
Joined 2009
quanghao.com/
Hi All!
some pictures IV use the audio output transformer LL1660
 

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andrea_mori

andrea_mori

Banned
Joined 2005
I have just received the last version PCB and I have some difficult to find all parts, because there are some differences from schematic to PCB and BOM. So I have some questions for Quanghao and all guys that built the DAC:

- which 74HC04 package, SOP or SOIC?
- I cannot find any switch suitable for P2, Mouser or Digi-Key part?
- at the upper right corner of the PCB there is a kind of transistor foot print, marked XLR IN, what is rhat?
- in the pictures published from Quanghao and other guys, SPDIF transformer is not fitted. Is it not needed for coaxial input?
- in DAC shunt regulator schematic and BOM I found 6 2K2 resistors (R5, R14,...). Where are them on the PCB?
- I found 6 10K resistors in shunt regulator BOM, but I cannot found them in schematic and PCB?!?!
- in PCB shunt regulator I found 6 diodes (D21...D26), but I cannot found them in schematic and BOM. What are them?
- in the pictures published I can see some capacitor (100 nf???) at each output of the shunt regulators, but I cannot found them in schematic and BOM. What are them?
- what Mouser or Digi-Key part for IRF heatsink?
- I have to choise output tubes, what do you suggest, 5687/E182CC/6DJ8/6922 or 6H30PI?

Thanks all for any help

Andrea
 
quanghao

quanghao

Member
Joined 2009
quanghao.com/
andrea_mori said:
I have just received the last version PCB and I have some difficult to find all parts, because there are some differences from schematic to PCB and BOM. So I have some questions for Quanghao and all guys that built the DAC:

- which 74HC04 package, SOP or SOIC?

74hc04 , can fin in ebay

- I cannot find any switch suitable for P2, Mouser or Digi-Key part

- at the upper right corner of the PCB there is a kind of transistor foot print, marked XLR IN, what is rhat?
Not use XLR in

- in the pictures published from Quanghao and other guys, SPDIF transformer is not fitted. Is it not needed for coaxial input?

Yes, only use Cap in put

- in DAC shunt regulator schematic and BOM I found 6 2K2 resistors (R5, R14,...). Where are them on the PCB?

change by zenner diode 2.7V

- I found 6 10K resistors in shunt regulator BOM, but I cannot found them in schematic and PCB?!?!
se in the pcb

- in PCB shunt regulator I found 6 diodes (D21...D26), but I cannot found them in schematic and BOM. What are them?

- in the pictures published I can see some capacitor (100 nf???) at each output of the shunt regulators, but I cannot found them in schematic and BOM. What are them?

- what Mouser or Digi-Key part for IRF heatsink?

- I have to choise output tubes, what do you suggest, 5687/E182CC/6DJ8/6922 or 6H30PI?

5687 or e182cc

thanks
Click to expand...
 
andrea_mori

andrea_mori

Banned
Joined 2005
quanghao said:
Please see this file !
thanks
Click to expand...
Hi quanghao,

I would like you reply to all my questions, because I have difficult to find some parts, because in some case is not clear what specific part are needed.
For example:
- 74HC04, I can also find it at mouser, but I asked which package, SOP or SOIC? Have you designed PCB for SOP or SOIC footprint?
- slide switch P2: you have designed PCB for a specific footprint, please let us know what specific Mouser or Digi-Key part fit correctly onto the PCB.
- about SPDIF transformer you said to use caps only, do I need some wire link on PCB instead of transformer?
- about 6 * 2K2 resistors you said to replace them with 2.7V zener, are them the diodes marked D21...D26 on the pcb?
- about capacitors at the output of each shunt regulator I've seen in some pitcures, but I can't find in the schematic and in BOM, what are them?
- again, you designed DAC PCB to use specific heatsink for IRF540/9540, I have difficult to find a suitable heatsink, please let us know what specific Mouser or Digi-Key part fit correctly onto the PCB
- the last schematic is not aligned to PCB and BOM (either DAC PCB than IV PCB), please publish the correct schematic

Thanks
Andrea
 
J

JohnGeneva

Member
Joined 2009
oakpointinvestments.com
Hi Guys, for Stage 4 1660 board Lundahl lists a ll1660 and ll1660s. Would one be better than the other? Would they both work?

I see Quanghao used the 10 MA version, there is also an 18ma version. Does it make a difference if I use one of the other. .

http://www.lundahl.se/pdfs/datash/1660.pdf
http://www.lundahl.se/pdfs/datash/1660s.pdf

These are the two fact sheets from Lundahl. Any recommendations/thoughts appreciated.
 
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