DIY Analog-to-Digital Converter project.Audio measurements tool - Page 15 - diyAudio
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Old 22nd January 2011, 04:27 AM   #141
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Default great on the board

I would have to be really in a jam to purchase that resistor,lol.
Have to keep that piece of test equipment in a safe,lol.

I'll watch the mailbox,,,,,,,,,,,
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Old 22nd January 2011, 04:36 AM   #142
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Quote:
Originally Posted by Frex View Post

For the 10M resistor,the precision in the BOM is a mistake.
You can use 1% or 5% value without any problem.
Just use metal film type, no carbon(high noise).


Frex
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Old 22nd January 2011, 06:23 AM   #143
Frex is offline Frex  France
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Hello all,

As i had already say in my previous post, the 10M resistor can be any tolerance (1-5%).It's not critical. Just use metal film resistor, no carbon type.
Tolerance noted in the BOM is a mistake. Sorry.

AR2, i'm glad you finally got your PCB !
Now you can start the job

Valeriano have finish his wiring and seem to have a working ADC (correct me if i'm wrong).He has report me a mistake concerning the two resistor R49 and R50.
(divider of the LT1963 voltage regulator).
For proper work you should solder as below :
R49=750 Ohms (but no 249)
R50=249 Ohms (but no 750)

I will notify that on the wiki page for all users.

AR2, i already have built two audio DAC , they just has not been described on the forum yet.
Just two pictures for you.

Click the image to open in full size.

Click the image to open in full size.

Regards.

Frex
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Old 22nd January 2011, 06:43 AM   #144
AR2 is offline AR2  United States
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Quote:
Originally Posted by Frex View Post
Hello all,
Now you can start the job
i will, I certainly will, once I finish this project...

Quote:
Originally Posted by Frex View Post
AR2, i already have built two audio DAC , they just has not been described on the forum yet.
Just two pictures for you.
Analog ballanced buffered Tx output for 6 of your DACs, he he
Attached Images
File Type: jpg BufferBoardAssembled.jpg (198.0 KB, 626 views)
File Type: jpg C65T5614.jpg (198.8 KB, 621 views)
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Last edited by AR2; 22nd January 2011 at 06:45 AM.
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Old 22nd January 2011, 05:37 PM   #145
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Quote:
Originally Posted by ghg View Post
Hi Frex

Impressive pcb work, fine.

Maybe you are looking for something readymade, and possible unbeatable, take a look at TI's PCM4222EVM ( US $ 149,-- +shipping ).
You just need a dual 15V and single 5V powersupply.

Here a FFT; source Krohn-Hite 4400A, both units SLA battery driven, PC interface RME-PAD via AES/EBU.
If you need speed -- take a look at the ADS1675 from TI.
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Old 23rd January 2011, 03:59 AM   #146
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Default Hi Frex,

The board arrived to day !!!!!
Thanks,
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Old 23rd January 2011, 02:06 PM   #147
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ok, a few more questions.

For R1, R14, R15, R28 would 619 or 649 .1% be appropriate? The lead time on 634 .1% is a bit long.

Will Mouser 571-5-1634513-1 fit for the right angle BNC connectors? I'm assuming 50 ohm impedance?

That 5 pin DIN connector you use looks really nice. I'm assuming it's an Amphenol Tuchel, but I cannot find it. Could I get a part number for that as well?

Thanks!
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Old 24th January 2011, 02:49 AM   #148
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Default hi frex,

Could you make a pic of the insides or of the board and make them full screen size?
This is my 1st venture into sm devices and it will help me id parts,and what they look like,
Thanks !!!!!!
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Old 24th January 2011, 10:04 AM   #149
Frex is offline Frex  France
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Hello luvdunhill,

R1, R14, R15 and R28 values are not critical. You can use 619 or 649 without problem.
You don't need to use 0.1% type; 1% are OK here. I will correct this too in BOM.
BNC connectors can be 50 or 75 Ohms type.We use it in low frequency range, so typical impedance
ie not a concern.

The Mouser part " 571-5-1634513-1" is ok for BNC PCB connector.

The 5 pins DIN connector is a Lumber ref KFV50/60, RS part n167-3659 or Farnell 119-3067.

noSmoking, You talk about AA5381 PCB ?

Ragards.

Frex.
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Old 24th January 2011, 01:15 PM   #150
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Default yes FREX

A full size thats maybe a little better to read.
I found the others in the eailer posts they fuzz out when I make them bigger,
Thanks Alot!
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