Audio Alchemy DDE v1.2 schematic? - diyAudio
Go Back   Home > Forums > Source & Line > Digital Source
Home Forums Rules Articles diyAudio Store Gallery Wiki Blogs Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

Digital Source Digital Players and Recorders: CD , SACD , Tape, Memory Card, etc.

Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Thread Tools Search this Thread
Old 7th July 2009, 05:14 PM   #1
diyAudio Member
Join Date: Oct 2007
Default Audio Alchemy DDE v1.2 schematic?

Does anyone have a Audio Alchemy DDE v1.2 schematic? The DDE v3.0 schematic I found was close but omits some of the features that the DDE v1.2 has.

My DAC has some issues with "secondary lock" and staticky noises from one channel when there is no data. I've replaced the CS8412 receiver with a good one with no improvement.

I am not certain how the "secondary lock" condition is met since there is no second PLL or anything like that I can find. The LED just doesn't turn on anymore. It used to turn on as soon as a CD would start playing. It might be looking at some of the CS8412 serial status data or not... The secondary lock LED is driven from a mpu and there is a PAL with unknown logic functions which complicates troubleshooting.

I've attempted to reach former AA people with so far no response. Any help would be appreciated. I would to fix this so I can start modding. Thanks.

  Reply With Quote
Old 13th November 2014, 07:03 PM   #2
PALUSE is offline PALUSE  Portugal
diyAudio Member
PALUSE's Avatar
Join Date: Oct 2008
Location: Europe - E.f.U-European. f**king. Union

I subscribe the same problema with "Secondary Lock".
The unit i am testing had a mute Left DAC, wich turn out to be a short circuit made by a film capacitor at the positive power line after the regulator.If you observe the clock line of the DACs with a scope you will see a complete "Pile of Xit" waveform...
  Reply With Quote
Old 7th December 2015, 01:20 AM   #3
PALUSE is offline PALUSE  Portugal
diyAudio Member
PALUSE's Avatar
Join Date: Oct 2008
Location: Europe - E.f.U-European. f**king. Union

Do you have any news about this problem?
I'm searching around the CMOS logic chips. So far the 74HC86 XOR and line driver 74HC244 seems good at the unit that i'm searching the "Secondary Lock Failure". I've checked the 47nF cap at the Crystal receiver PLL filter pin, and its fine too.
Only left the PAL an the two Flip-Flops chips for study.

I'm still digging...
  Reply With Quote


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Similar Threads
Thread Thread Starter Forum Replies Last Post
Audio Alchemy DDE v3.0 schematic Flying_Scotsman Digital Source 8 14th July 2014 09:36 PM
Audio Alchemy DDE V1.0 schematic jean-paul Digital Source 13 18th April 2014 12:15 AM
Schematic for Audio Alchemy DDE V1.0 Edlo Digital Source 0 31st October 2004 04:10 PM
Audio Alchemy DDE v1.0 mods/schematic Tutordennis Digital Source 0 24th September 2004 12:41 AM
schematic Audio Alchemy DDE V1.0 Guido Tent Digital Source 2 16th May 2003 04:47 PM

New To Site? Need Help?

All times are GMT. The time now is 04:06 PM.

vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
Copyright 1999-2017 diyAudio

Content Relevant URLs by vBSEO 3.3.2