my DAC design - pup1 DAC
Mar 14, 2011 at 1:59 PM Post #63 of 675
Hi guys. This is my first post on this forum so i want to say THANKS because i found much helpful advices and tips. I just hope that i will be able to contribute somehow.
 
My first post on this forum and i already have ignorant question. Cobaltmute i am very interested in building your proto-dac. I already have some pcm2707 and pcm1794 so i decided to build pup1. Would it be a problem to you to upload BOM in .pdf ? :D
I was also wondering, will the output stage give enough power to drive my gainclone with lm1876 chip ?
I also want to build pcb  and  i was wondering could i use prints given on the first page (with applied modification that you mentioned later) ?
 
EDIT
Please forget uploading .pdf file. I menage to convert xlsx file.
 
Mar 16, 2011 at 10:48 PM Post #64 of 675
@chakija - I suspect any image that I posted will not work as scale would be off. My best advice it wait a little while till I get the revision of the board done.
 
@Those who I have acknowledged as getting prototype boards:
 
I got a package with chips in it from tomb today. So the next steps:
1) PM your address formatted in the PM in address label format to get the envelope to you. I will be copying it and printing it out to tape directly on the envelope. This is the simplest way to ensure that correct addresses on are envelopes.
2) In the PM include a PM that I can send the Paypal request to.
 
I will pack up the boards and chips and then send you the Paypal request. Once that is paid, I will drop the envelope in the mail. I'm hoping to have them all packed tomorrow night, but if not, given what my weekend schedule is already calling for, they will be completed on Monday night.
 
Mar 17, 2011 at 12:25 PM Post #65 of 675
I was just having a look again on the schematic...
 
If you're going to do production runs, it might be a good idea to add a 22 or 47r resistor at the output of the opamp. Ultra low output impedance isn't needed for a DAC and it would shield the opamp from cables' capacitance, etc.
 
Mar 19, 2011 at 11:01 AM Post #66 of 675
@cobaltmute
Thank you very much for your reply. I will wait for your revision of pcb. I also would gladly buy it from you if i was living in a Canada...
In meantime, i will collect all parts from BOM file. I hope that changes made on layout wont affect it.
 
Mar 21, 2011 at 7:54 AM Post #68 of 675
There are three people who I confirmed would get protos that have not PM'ed me their address yet.
 
It would be very nice to have that information by this evening for me so that I can finish packing all the boards at once.
 
Mar 23, 2011 at 3:34 PM Post #71 of 675
For those that have sent me addresses, your envelopes went in the mail today.
 
There are two that have not e-mailed me a postal address.  If they don't in the next few days, I'm going to release the boards allocated to them for others.
 
Mar 23, 2011 at 8:41 PM Post #73 of 675
 
As always, I'm up for a proto, sorry I missed the initial prototype call!I can be patient too, thanks for this one, it looks great!!
 
 
 
Mar 24, 2011 at 7:12 PM Post #74 of 675


Quote:
For those that have sent me addresses, your envelopes went in the mail today.
 



I hope that means I will get it tomorrow!!! My digikey order with all the parts will be in tomorrow, I sure hope I can build it this weekend!!
 
Mar 25, 2011 at 8:03 AM Post #75 of 675
Okay, one week to wait for an address from active people on the forum is long enough.  Releasing the last two boards to others.
 
Going from order of interest postings, chakija and nightanole get first shot if they want the two boards.  They will ship with the PCM chips.  PM your address and paypal email and I will ship them to you.
 
If they don't take them Avro_Arrow and Billyk are the next in line.
 

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