Another DAC + Headphone amp - Page 2

ghetto · 3rd September 2007, 03:14 AM

There were lots of errors with the original schematic.

- Left and right channels were switched at headphone jack.
- Mute on PGA2310 was not connected to a pin on the micro.
- Chip select not connected to a pin on the micro.
- Others that escape me now.

There have been some other changes:
- Reset supervisor to prevent power-on glitches.
- Relay to suppress TPA6120 power-on thumps.
- Bicolor LED (lock / no lock indicator?) Good for debugging.
- 36Khz IR receiver added.
- Alps encoder with switch added. Switch function not chosen yet.
- Ditched LT1963 for +/-12V (DD5 package = huge), kept for +5V. Probably no audible difference anyway.

I think that covers the changes. The PCB is getting closer. Some packages need tweaking, some traces need rerouting... I bet you will find a few things you don't like.

gmarsh · 5th September 2007, 12:53 PM

You can get the WM8816 from Newark.com in single quantities.

Antonytls · 8th October 2007, 07:47 AM

WM8816 is no longer available on Farnell and Newark...

ghetto · 8th October 2007, 06:01 PM

Hi guys. Sorry for the lack of updates. I had knee surgery about 3 weeks ago and I just haven't had the motivation to continue work on the project yet. I will get back to it though!

DVBjunky · 10th July 2008, 04:02 PM

WM8816 is discontinued......MAS9116 also....the new MAS DA6116 is not easy to find. Can anyone help with a source?

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5th September 2007, 12:53 PM	#12
gmarsh diyAudio Member Join Date: Apr 2004 Location: Halifax, NS, Canada	You can get the WM8816 from Newark.com in single quantities.

8th October 2007, 07:47 AM	#13
Antonytls diyAudio Member Join Date: Mar 2004 Location: Toulouse	WM8816 is no longer available on Farnell and Newark...

8th October 2007, 06:01 PM	#14
ghetto diyAudio Member Join Date: Jul 2003 Location: Oklahoma	Hi guys. Sorry for the lack of updates. I had knee surgery about 3 weeks ago and I just haven't had the motivation to continue work on the project yet. I will get back to it though!

10th July 2008, 04:02 PM	#15
DVBjunky diyAudio Member Join Date: Dec 2006	WM8816 is discontinued......MAS9116 also....the new MAS DA6116 is not easy to find. Can anyone help with a source?

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