Audio Alchemy DDE v3.0 schematic

[Flying_Scotsman]

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.
thanks!

 

[carlosfm]

AA v3.0 owner and specialist comes to the rescue

Hi!
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).

 

[rickcr42]

check the faq section at the Audio asylum ,i think the schematic is there

 

[Flying_Scotsman]

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......

cheers,

 

[carlosfm]

Did you fix the problem?

 

[Flying_Scotsman]

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!

 

[audioalt]

Hi,

Does anyone have a schematic for Audio Alchemy DDE v3 ?

Would really appreciate it.

Thanks
Al

 

[stephensank]

PM me with your email & I'll send it to you.

 

[douga409]

schematic for Audio Alchemy DDE v3

Do you still have a copy of the schematic for Audio Alchemy DDE v3? Also, does anyone know where I could get a hold of the chip and how to install notes for the remote chip for these units?

Thanks in advance

Doug