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Old 2nd August 2004, 06:26 PM   #1
diyAudio Member
Join Date: Jul 2004
Location: London
Question Audio Alchemy DDE v3.0 schematic

Hi all.

Does anyone have the schematic for the AA DDE v3.0?

I've had mine for a few years now but it's RHS channel has died on me. I'm sure the problem is somewhere in the analogue output stage since the 'D14' LED isn't lit.... but it's a multi-layer board and very tricky to trace.

PS Since Audio Alchemy is out of business, I tried contacting Dusty Vawter but to no avail

Any help would be gratefully received.
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Old 2nd August 2004, 07:57 PM   #2
Join Date: Mar 2003
Location: Lisbon, Portugal
Cool AA v3.0 owner and specialist comes to the rescue

I don't know if it would be appropiate to post that schematic here, I like to respect copyrights...
Anyway, AA has hit the dust long time ago.
Send me an e-mail, I'll repply with the schematic.

BTW, check those OP275 op-amps of the analog PSU, they get VERY hot, specially with the standard unregulated PSU.
After you solve the problem, you may think of making a regulated PSU, you won't believe the difference in sound quality, and also much cooler running of the dac.
Or, as a cheaper alternative, regulate the standard PSU, I've done it too, I could fit everything inside, it works well too.
Regulate for +/-8v (digital) and +/- 18v (analog).
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Old 2nd August 2004, 11:10 PM   #3
diyAudio Member
Join Date: Nov 2000
check the faq section at the Audio asylum ,i think the schematic is there
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Old 13th August 2004, 04:52 PM   #4
diyAudio Member
Join Date: Jul 2004
Location: London
Hi Guys,

thanks to both of you for your help. Hope I can offer some assistance to either of you some time.

Now, where's my soldering bolt......

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Old 13th August 2004, 06:39 PM   #5
Join Date: Mar 2003
Location: Lisbon, Portugal
Did you fix the problem?
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Old 21st November 2004, 10:19 AM   #6
diyAudio Member
Join Date: Jul 2004
Location: London
Hi Carlos,

just to let you know I finally got round to having a look at my DDE (have been v busy for a few months but really started to miss listening to my CD's properly!).

I haven't quite fixed the problem yet, but I've found that there is no -15VAR at pin 4 of the OP176GP - it's not a PSU issue either (it checks out OK but I see what you mean about it being unregulated - it kicks out almost +/-20V (supposed to be +/-18V?) with about 0.5V difference between + and - )

Anyhow, thanks to you guys on diyAudio I'm at least making progress.

Hey, assuming I get it working again can you direct me to any posts discussing upgrades of the PSU or other tweaks?

thanks again!
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Old 14th March 2013, 10:26 PM   #7
diyAudio Member
Join Date: Jun 2010

Does anyone have a schematic for Audio Alchemy DDE v3 ?

Would really appreciate it.

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Old 15th March 2013, 05:18 AM   #8
diyAudio Member
Join Date: Oct 2006
PM me with your email & I'll send it to you.
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