My USB audio DAC (PCM2702)

veteran · 24th July 2006, 10:32 AM

I finally finished my USB audio DAC basing on TI PCM2702 chip. Black Gate N in signal path was the best compromise between price and size. This way it's quite compact.

documentation

CJ900RR · 24th July 2006, 04:06 PM

Looking good! Really nice. Im working on a simulare one based on the PCM2906.

How do you control pin 10, 11 and 12 (PLYBCK, SSPEND and ZERO)?

veteran · 25th July 2006, 06:37 AM

Quote:

Originally posted by CJ900RR
Looking good! Really nice. Im working on a simulare one based on the PCM2906.

How do you control pin 10, 11 and 12 (PLYBCK, SSPEND and ZERO)?

And it sounds nice to

I only use PLYBCK pin to visualize that there is signal incoming. Another LED is connected to (+) supply.

I have got few PCM2706 boards almost ready.

xaudiox · 26th July 2006, 10:04 AM

nice dac veteran!

curtvm · 26th July 2006, 02:16 PM

Nice looking board (all your stuff looks good)-

I like the look of your schematics, may I ask what software you use for your schematics/pcb layout?

Thanks!

veteran · 14th August 2006, 07:44 AM

Quote:

Originally posted by curtvm
Nice looking board (all your stuff looks good)-

I like the look of your schematics, may I ask what software you use for your schematics/pcb layout?

Thanks!

Protel mostly with my own libraries.

curtvm · 14th August 2006, 08:55 PM

Thanks for the reply!

That is the key to the good looking schematics I guess- you make your own parts libraries- which look very nice.

I like the "real world" look of your parts.

I'm currently using WinQcad www.winqcad.com (free up to 499 pins), which is a very nice package (good autorouter). I will try making my own parts that look "real"- thanks for the tip!

Keep up the good work.

danb1974 · 17th August 2006, 06:19 PM

On a side note, why use autorouter especially on analogue stages, does it know how to avoid ground loops or try to keep l/r channels symmetrical?

I think you have to start with good component placement, with the bonus that it will make routing easier.

morpheus82 · 17th August 2006, 08:33 PM

veteran, i'm interested in pcm2902, i know it has i/o usb and i/o s/pdif, so is it possible to use that chip also to connect an digital cdrom output?i mean, use both usb and s/pdif for inputs?

24th July 2006, 10:32 AM	#1
veteran diyAudio Member Join Date: Feb 2004 Location: Poland	My USB audio DAC (PCM2702) I finally finished my USB audio DAC basing on TI PCM2702 chip. Black Gate N in signal path was the best compromise between price and size. This way it's quite compact. documentation __________________ Simple audio solutions blog.unisonus.com

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24th July 2006, 04:06 PM	#2
CJ900RR diyAudio Member Join Date: Jan 2006	Looking good! Really nice. Im working on a simulare one based on the PCM2906. How do you control pin 10, 11 and 12 (PLYBCK, SSPEND and ZERO)?

26th July 2006, 10:04 AM	#4
xaudiox diyAudio Member Join Date: Jul 2006	nice dac veteran!

26th July 2006, 02:16 PM	#5
curtvm diyAudio Member Join Date: Apr 2006 Location: Earth	Nice looking board (all your stuff looks good)- I like the look of your schematics, may I ask what software you use for your schematics/pcb layout? Thanks!

14th August 2006, 08:55 PM	#7
curtvm diyAudio Member Join Date: Apr 2006 Location: Earth	Thanks for the reply! That is the key to the good looking schematics I guess- you make your own parts libraries- which look very nice. I like the "real world" look of your parts. I'm currently using WinQcad www.winqcad.com (free up to 499 pins), which is a very nice package (good autorouter). I will try making my own parts that look "real"- thanks for the tip! Keep up the good work.

17th August 2006, 06:19 PM	#8
danb1974 diyAudio Member Join Date: Jul 2005 Location: Timisoara	On a side note, why use autorouter especially on analogue stages, does it know how to avoid ground loops or try to keep l/r channels symmetrical? I think you have to start with good component placement, with the bonus that it will make routing easier.

17th August 2006, 08:33 PM	#9
morpheus82 diyAudio Member Join Date: Oct 2004	veteran, i'm interested in pcm2902, i know it has i/o usb and i/o s/pdif, so is it possible to use that chip also to connect an digital cdrom output?i mean, use both usb and s/pdif for inputs?

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