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Old 26th October 2012, 04:43 PM   #141
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Quote:
Originally Posted by andrea_mori View Post
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
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Old 26th October 2012, 05:21 PM   #142
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Quote:
Originally Posted by lil' knight View Post
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
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Old 27th October 2012, 07:33 AM   #143
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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.
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Old 27th October 2012, 03:40 PM   #144
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Quote:
Originally Posted by lil' knight View Post
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?
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Old 27th October 2012, 04:43 PM   #145
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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.
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Old 28th October 2012, 12:18 AM   #146
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Originally Posted by lil' knight View Post
Look for the Aavid 2.5" to-220 heatsinks for best heat dissipating.
Right, I choose a 3.4C/W thermal resistance, but the Aavid heatsink is 2.6C/W.
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Old 2nd November 2012, 11:35 AM   #147
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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
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Old 4th November 2012, 09:49 AM   #148
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Anyone can help me?
Andrea
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Old 5th November 2012, 12:26 AM   #149
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Quote:
Originally Posted by andrea_mori View Post
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!
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Old 5th November 2012, 08:11 AM   #150
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Originally Posted by quanghao View Post
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
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