Audio Alchemy DDE v3.0 schematic

Flying_Scotsman · 2nd August 2004, 06:26 PM

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 · 2nd August 2004, 07:57 PM

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 · 2nd August 2004, 11:10 PM

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

Flying_Scotsman · 13th August 2004, 04:52 PM

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 · 13th August 2004, 06:39 PM

Did you fix the problem?

Flying_Scotsman · 21st November 2004, 10:19 AM

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!

2nd August 2004, 06:26 PM	#1
Flying_Scotsman diyAudio Member Join Date: Jul 2004 Location: London	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. thanks!

2nd August 2004, 07:57 PM	#2
carlosfm Banned Join Date: Mar 2003 Location: Lisbon, Portugal	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).

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2nd August 2004, 11:10 PM	#3
rickcr42 diyAudio Member Join Date: Nov 2000	check the faq section at the Audio asylum ,i think the schematic is there

13th August 2004, 04:52 PM	#4
Flying_Scotsman 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...... cheers,

13th August 2004, 06:39 PM	#5
carlosfm Banned Join Date: Mar 2003 Location: Lisbon, Portugal	Did you fix the problem?

21st November 2004, 10:19 AM	#6
Flying_Scotsman 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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