A nice dac to complement the Aleph-X.

[pquadrat]

Some postings above I was writing about a DAC with PCM1702 and Pass D1 output stage. I have finished it now:

[pquadrat]

This is the PCB.
The project was more a "proof of concept" and a test if I can get it running, not to be the ultimate DIY DAC. But i tried to use most information and tips I found, except about special oscillator circuits. Just one thing at a time

Short description: optical receiver TORX176, receiver TI DIR1703 switchable between coax and optical input, next step is the Analog Devices AD1896A Sample rate converter to upsample to 96kHz. It feeds the TI DF1706 digital filter to drive four PCM1704 DACs for balanced output. I/U Conversion is PASS D1.
Voltage regulation for digital part (3.3V, +- 5V) is on board, +-30V for output stage has to be supplied. I use one of my ONO power supply boards, which gives a nice regulated +-30V.
There are two errors in the layout. one trace between the two rectifier bridges has to be cut, and I forgot to place the output caps of the D1 stage. But otherwise it seems to work nice, and it sounds fine.

I will not make another large group buy from this, like the ONO, VERY limited time this year on, but I have left seven of this boards. I ordered ten pieces. If there is any interest, please email. But because of time, I can not give much support beside schematics. You should know what You are doing, and be able to read and understand the data sheets of the used parts.

-Peter

[pquadrat]

Originally posted by pquadrat
Some postings above I was writing about a DAC with PCM1702 and Pass D1 output stage. I have finished it now:

Of course the DACs are PCM1704 !

[Sparhawk]

Originally posted by pquadrat

I will not make another large group buy from this, like the ONO, VERY limited time this year on, but I have left seven of this boards. I ordered ten pieces. If there is any interest, please email. But because of time, I can not give much support beside schematics. You should know what You are doing, and be able to read and understand the data sheets of the used parts.

-Peter

This is just what I was looking for; I'm definitely interested in one of these boards. I sent you a message.

[blank527]

Hi,

I mailed you before, but i'm not sure wether it came or not.
Hence this reply.
Nice DAC you have buid there!
How does it sound?
I would be (very) interested in buying a PCB from you, since you got spare left.
How much does 1 PCB cost?
Thank you,
Remco Blankesteijn

[moe29]

i bet that took more than an afternoon
to solder up!

verrry nice


-------------
moe29
-------------

[Apogee]

Peter,

Nice Job!!!!

I too would be interested in purchasing one of the boards...

I sent you a message via email.

Thank You!

[uli]

Originally posted by pquadrat
This is the PCB.

I will not make another large group buy from this, like the ONO, VERY limited time this year on, but I have left seven of this boards. I ordered ten pieces. If there is any interest, please email. But because of time, I can not give much support beside schematics. You should know what You are doing, and be able to read and understand the data sheets of the used parts.

-Peter

Hi Peter,
how much do you charge for 1 board (incl. schematics)?

Uli

[pquadrat]

Price for one of these boards is EUR 30,-. A power supply board from the Ono for the +-30V is EUR 25,-, but You can easily build Your own PS.

I have more than 7 askings for the boards now, and will sell to the first seven orders. But please only one board per order.

Originally posted by Sparhawk


This is just what I was looking for; I'm definitely interested in one of these boards. I sent you a message.

I have emailed You directly.

Originally posted by blank527
Hi,

I mailed you before, but i'm not sure wether it came or not.
Hence this reply.
Nice DAC you have buid there!
How does it sound?
I would be (very) interested in buying a PCB from you, since you got spare left.
How much does 1 PCB cost?
Thank you,
Remco Blankesteijn

I have emailed You directly.

Originally posted by moe29
i bet that took more than an afternoon
to solder up!

verrry nice


-------------
moe29
-------------

Exactly two! Looks harder than it is.

Originally posted by Apogee
Peter,

Nice Job!!!!

I too would be interested in purchasing one of the boards...

I sent you a message via email.

Thank You!

I have emailed You directly.

Originally posted by uli



Hi Peter,
how much do you charge for 1 board (incl. schematics)?

Uli

I have emailed You directly.

[pquadrat]

You can download schematics now:

www.neunelfer.de/DAC.zip

(available only for limited time, my web space is limited)

Parts list will follow.