DAC-END The best DAC AD1865- UPDAT 2011

[lil' knight]

Originally Posted by andrea_mori

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:

I have just finished the Mouser BOM for myself, basing on the latest PCB's revision. Let me know if you need it

[andrea_mori]

Originally Posted by lil' knight

I have just finished the Mouser BOM for myself, basing on the latest PCB's revision. Let me know if you need it

Hi,
I also prepared a BOM with parts from Mouser/Parts Connexion and eBay and I'll post it for other diyers.
Could you post your BOM, so we can compare with mine to produce the final BOM?

Andrea

[lil' knight]

Yeah, sure. Mine is attached.
There are some missing parts because I've already have them in the parts bin so I just left them out from the BOM.
Also, I overspec'd some caps, increased the quantity of some easy-to-fail (2sk170, bc550, bc560, mje350, irf9510...) parts to have some backups in case something goes wrong during the build.

[andrea_mori]

Originally Posted by lil' knight

Yeah, sure. Mine is attached.
There are some missing parts because I've already have them in the parts bin so I just left them out from the BOM.
Also, I overspec'd some caps, increased the quantity of some easy-to-fail (2sk170, bc550, bc560, mje350, irf9510...) parts to have some backups in case something goes wrong during the build.

I attach my BOM, all parts except for the case, from Mouser, Parts Connexion and eBay.

A few questions:
- did you mount SPDIF transformer?
- about IV HV: are you using centre tapped 260-0-260 and 2 rectifiers only or single 0-260 and 4 rectifiers?

[lil' knight]

You can skip the spdif transformer if you only use coaxial input.

I use 0-260v transformer and 4 recitifiers. Look for the Aavid 2.5" to-220 heatsinks for best heat dissipating.

[andrea_mori]

Originally Posted by lil' knight

Look for the Aavid 2.5" to-220 heatsinks for best heat dissipating.

Right, I choose a 3.4°C/W thermal resistance, but the Aavid heatsink is 2.6°C/W.

[andrea_mori]

Hi all,
I'll use 5687 and E182CC tube, so I have the following questions:
- filament: linking J1 seems the heaters are powered wih 12.6V, so what secondaries of R80-36 transformer should I use? more simple, what colours?
- anode: using 4 rectifiers and R80-36 transformer, what secondaries should I use 0-230 or 0-260? in parallel? more simple, what colours?

Thanks
Andrea

[andrea_mori]

Anyone can help me?
Andrea

[quanghao]

Originally Posted by andrea_mori

Hi all,
I'll use 5687 and E182CC tube, so I have the following questions:
- filament: linking J1 seems the heaters are powered wih 12.6V, so what secondaries of R80-36 transformer should I use? more simple, what colours?
- anode: using 4 rectifiers and R80-36 transformer, what secondaries should I use 0-230 or 0-260? in parallel? more simple, what colours?

Thanks
Andrea

hi!
if use 5687 or e182cc use 12Vac for filament

use 0-220Vac for shunt!

[andrea_mori]

Originally Posted by quanghao

hi!
if use 5687 or e182cc use 12Vac for filament

use 0-220Vac for shunt!

Hi Quanghao,

0-220Vac does not exist, HV secondaries of R80-36 are 260-230-0-230-260, do you mean 0-230 in parallel full wave rectified (230Vac * 1.414 = about 325 Vcc)?

Andrea