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Old 25th June 2012, 04:22 PM   #201
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Hi Jean Paul & unixdeveloper (Hello to everyone esle too)

I'm checking parts accordind to the published BOM, the order will be placed at Mouser's.
BTW some questions to ours experts.

1 - Posted BOM seems to content typos
01 -> 5 caps (C1-2-5-7-30) but 7 in Qty column...
06 -> 4 caps (C16-23-31-10B) but 2 in Qty column...

2 - Alternative Parts at Mouser's
06 -> Same size Polymer - Ref : 647-RR71C101MDN1 - 7 mOhms only !
17 -> 0R Thick Film - Ref : 667-ERJ-6GEY0R00V - No 0R thin film 0805...
20 -> Alternatives : 926-LP2985AIM5-36 (NS/Ti) or 926-LP2985AIM536NOPB (NS/Ti)
21 -> Alternatives : 595-LP2985-33DBVTG4 (Ti) or 511-LD2985BM33 (ST)

3 - BOM for the PSU, when available

Nice to read your answers and informations
Thanks for your help and input

Phil

Last edited by korben69; 25th June 2012 at 04:45 PM.
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Old 25th June 2012, 04:37 PM   #202
syklab is offline syklab  Hong Kong
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Quote:
Originally Posted by korben69 View Post
Hi Jean Paul & unixdeveloper (Hello to everyone esle too)

I'm checking parts accordind to the published BOM, the order will be placed at Mouser's.
BTW some questions to ours experts.

1 - Posted BOM seems to content typos
01 -> 5 caps (C1-2-5-7-30) but 7 in Qty column...
06 -> 4 caps (C16-23-31-10B) but 2 in Qty column...

2 - Alternative Parts at Mouser's
06 -> Same size Polymer - Ref : 647-RR71C101MDN1 - 7 mOhms only !
17 -> 0R Thick Film - Ref : 667-ERJ-6GEY0R00V - No 0R thin film 0805...
20 -> U3 - No Alternative found. Please Check
21 -> Alternatives : 595-LP2985-33DBVTG4 (Ti) or 511-LD2985BM33 (ST)

3 - BOM for the PSU, when available

Nice to read your answers and informations
Thanks for your help and input

Phil
You can try TI LP2985AIM5-3.6/NOPB for U3 Alternative

LP2985AIM5-3.6/NOPB - NATIONAL SEMICONDUCTOR - IC, LDO REG | e絡盟 Hong Kong
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Old 25th June 2012, 04:45 PM   #203
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Thank you skylab for pointing those LDO devices
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Old 25th June 2012, 05:13 PM   #204
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No, don't use LP2985, it has 30 V noise so it is just slightly better than 78XX regs. It is one of the worse regs in 3.3 V for audio. AFAIK MIC5205 is less noisy or use the good ADP151 (9V noise) but unfortunately there is no 3.6 V version of that one. You need 3.6 V for the ES9023 to squeeze the best out of it. If you use ADP151 you could measure the ones you have and use the one that has 3.3 V or more for the ES9023. I bought some of them and they varied but most of them were exactly 3.3 V. The ES9023 likes 3.3 V and even better 3.6 V. This is essential for the charge pump as that one has to generate -3.3 V. If is it lower clipping can occur with low impedance load.

With ADP151 results are otherwise fine and you can omit the 470 pF caps. Input and output caps have to be changed too with ADP151 ! Also input and output cap must be the same value. I used 1 uF PPS film caps. One of my prototypes was made with 4 x ADP151 and it did sound very good on 3.3 V. I even thought it was slightly better than an all MIC5205 type but also caps were different so I can not give a neutral verdict. Remember that R11 also has to be another value depending on V+ of the ES9023.

A lot of words. In short: if you want the best use MIC5205 with ADP151 as a fine second choice. IMO you should choose for the best when you build a DAC otherwise building one yourself does not make sense.
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Last edited by jean-paul; 25th June 2012 at 05:43 PM.
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Old 25th June 2012, 06:42 PM   #205
syklab is offline syklab  Hong Kong
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Hi JP.
How about replaCing U3 with a 5V reg MIC5205-5.0YM5 TR instead of the 3.6. Do you think the chip ESS9023 will be ABLE TO HANDLE THE EXTRA VOLTAGE?
jUST SOME THOUGH IF WE CANNOT GET THE 3.3v VERSION OF mic5205.

tHANKS AND REGARDS\
KEYBOARD ACTING CRAZY!!!
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Old 25th June 2012, 07:01 PM   #206
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不可能
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Last edited by jean-paul; 25th June 2012 at 07:30 PM.
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Old 25th June 2012, 11:06 PM   #207
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We will stick to the Official BOM concerning MIC5205-3.3v and 3.6v.
A solution has been found
Cheers
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Old 26th June 2012, 04:38 PM   #208
palmito is offline palmito  United States
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I know the dac is spdif, I searched the thread for i2s and didn't find much. I would just like to know if there's any place at all in the dac board where i2s input could be "grafted"? Thanks.
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Old 26th June 2012, 04:57 PM   #209
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Quote:
Originally Posted by palmito View Post
I know the dac is spdif, I searched the thread for i2s and didn't find much. I would just like to know if there's any place at all in the dac board where i2s input could be "grafted"? Thanks.
Yes, the whole S/PDIF section can be ignored and i2s input can be fed to the DAC. Please take a look at the build guide which I will be mailing out to all members today.
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Old 27th June 2012, 08:25 PM   #210
VT67 is offline VT67  Belgium
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Quote:
Originally Posted by unixdeveloper View Post
Please take a look at the build guide which I will be mailing out to all members today.
Is this already sent because I haven't received it?

Regards
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