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Frex 20th October 2010 06:45 PM

DIY CS5381 Analog-to-Digital converter PCB Group buy
5 Attachment(s)

After some demand, i open a wiki page for started a group buy of PCB
to build the ADC project describe in the thread HERE.
If you think to be interested by it, i highly recommend you to read it !
If you need further info about the design, you can post a message in the wiki.
Of course, all designing files will be send for each buyers.
(A very complete folder).

You can download the full schematic HERE .
A little manual of the ADC can lso be read HERE .

All others files will be send to buyers.

Note that a logic array (EPM3064) must be programmed,
so you need an ALTERA JTAG programmer.

For buyers who don't have it and don't want buy it, i can provide PCB with the EPM3064 soldered and programmed for extra 15.

I have add a column to select or not the option of mounting/programming the
Logic IC (EPM3064).

The price for 1 PCB would be 40 if less than 6 PCB is ordered and 35 if more than 10.
This price include worldwide shipping in priority letter.

The buyers list start here :

NamePCB QtyProgrammed [yes/no]LocationPayedShippedReceived
carpin1yesNetherlandsYesYesYes 21 dec

Added the 13/01/2011
I add a column named "received".
Each buyers can send me PM e-mail me or edit himself the list, in order to follow if all all letters are well arrived.


1/Resistor values of R49 and R50 are inverted,
For proper work you should solder as below :
R49=750 Ohms (but no 249)
R50=249 Ohms (but no 750)

2/ For the 10M resistor(R6,R13,R19,R27),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 23rd October 2010 04:42 PM

I have add a column in the table for select or not the option of buying PCB with the
logic IC (EPM3064), soldered and programmed.
I will ask an extra 15 for that.


noSmoking 26th October 2010 11:46 AM

after looking at the 3064 data sheet ,
hi Frex, :D
You got a deal for me ,after looking at the data sheet:eek: ,I would gladly pay you extra to program and solder in the chip!:confused::rolleyes::D
Thanks ,

noSmoking 26th October 2010 07:14 PM

nice picture!

Frex 28th October 2010 03:44 PM


Currently, only 6 cards are pre-ordered.
I wait a few more days and if all buyers are ok, I would start the group buy and then I would send Paypal invoices .


noSmoking 29th October 2010 03:17 AM

HI frex,
Do as you like from me a few more days is ok with me!
Was hoping you'd get ten though!


carpin 30th October 2010 09:59 PM

For me it's also oke to wait for more participants

Valeriano 31st October 2010 05:03 PM

Hi Frex,

thanks for your great projects, why don't you list this GB in the appropriate section (Group Buys) for raising the number of people interested in it?
regarding myself I'm fine with 6 pcbs order, but maybe others could be eventually interested, too.

kind regards

Frex 1st November 2010 07:06 AM

Hello Valeriano,

It's a good idea. I've added a topic about it in the group-buy section. :)
We will wait a little then.


Valeriano 9th November 2010 02:00 PM


Originally Posted by Frex (
Hello Valeriano,

It's a good idea. I've added a topic about it in the group-buy section. :)
We will wait a little then.


Hi Frex.

almost there :) 9 pcbs in preorder, only one missing.
if all participants agree, two more weeks for closing this GB should be enough. what do you guys think?

regarding input buffer stage.. reading the discussion in original thread post#32 .. you choosed OPA134 for its low input bias current and its low current noise.. for making hi-Z sources measurements.
what do you think about OPA140 and OPA827 ? these seems to have better specs overall vs OPA134


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