Go Back   Home > Forums > Source & Line > Digital Line Level

Digital Line Level DACs, Digital Crossovers, Equalizers, 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
Reply
 
Thread Tools Search this Thread
Old 23rd September 2012, 10:15 AM   #101
diyAudio Member
 
abraxalito's Avatar
 
Join Date: Sep 2007
Location: Hangzhou - Marco Polo's 'most beautiful city'. 700yrs is a long time though...
Blog Entries: 83
Send a message via MSN to abraxalito Send a message via Yahoo to abraxalito Send a message via Skype™ to abraxalito
I reckon its OK - the datasheet isn't very clear about the maximum die temperature but says the maximum ambient is 85oC - if you can hold the back of your hand against the ally then its probably no hotter than 60oC.
__________________
The great audio capacitor myth : 'There's such a thing as too many PSU caps'.
  Reply With Quote
Old 6th October 2012, 12:20 AM   #102
diyAudio Member
 
Join Date: Jan 2010
Location: Cornwall
The DAC is sounding great with just my caps on the output to eliminate DC bias. Is there any need for anything more complicated on the output to remove the DC bias? I try to keep minimal components in the signal path in my audio builds. Speaking of signal paths,.
__________________
Another project of mine: (a very big one at that!)
http://www.mp3car.com/vbulletin/show...5-pimping.html
  Reply With Quote
Old 6th October 2012, 12:58 AM   #103
diyAudio Member
 
abraxalito's Avatar
 
Join Date: Sep 2007
Location: Hangzhou - Marco Polo's 'most beautiful city'. 700yrs is a long time though...
Blog Entries: 83
Send a message via MSN to abraxalito Send a message via Yahoo to abraxalito Send a message via Skype™ to abraxalito
If the caps are working then no, there isn't. Speaking of 'signal paths' I'm not a believer in them though its a very common myth. Current flows in circles so the 'return path' is as important as the 'signal path'.
__________________
The great audio capacitor myth : 'There's such a thing as too many PSU caps'.
  Reply With Quote
Old 24th October 2012, 05:58 PM   #104
diyAudio Member
 
Join Date: Jan 2010
Location: Cornwall
Haven't posted in a while, been busy trying to build an extension on my house before me and the wife have out first baby. The DAC is still sounding great when I have the chance to listen to it. Will post some pictures when I eventually assemble my DAC/Pre amp.

Thanks again for everyone's help
__________________
Another project of mine: (a very big one at that!)
http://www.mp3car.com/vbulletin/show...5-pimping.html
  Reply With Quote
Old 14th December 2012, 10:05 AM   #105
diyAudio Member
 
Join Date: Jan 2010
Location: Cornwall
Extension finished, but my baby is due any time, so havn't had time to build my DAC pre amp, but the DAC is still sounding great, even if the DAC chips get a little warm. Nothing a small heatsink won't sort out
__________________
Another project of mine: (a very big one at that!)
http://www.mp3car.com/vbulletin/show...5-pimping.html
  Reply With Quote
Old 30th January 2013, 08:02 PM   #106
diyAudio Member
 
Join Date: Jan 2010
Location: Cornwall
It's been a long time, but here are a few pics of the 'almost finished' DAC/Pre amp:

Click the image to open in full size.

Here is a pic of the various PCBs inside the enclosure. All PCBs are made by me, except the DIR9001 receiver board.

The pot is an Alps motorized 100K Log and is controlled via my PIC microprocessor board. This controls the 'Lightspeed Attenuator' circuit.


Click the image to open in full size.

8 DACs in parallel and a 10mm thick piece of aluminium used as a heat sink and also part of the lid.

Click the image to open in full size.

1 x Coax digital in
1 x Optical digital in
2 x Analogue in
and obviously 1 x output.

There is a switch which selects 'Auto' or 'On'. In 'Auto', it automatically powers up when 24 volts are present on the jack plug under it.

The dial on the left is a rotary encoder which can be used to select the input required and can be pressed to mute. When in mute mode, the power LED flashes. If you are on a digital input (1 or 2) and no valid signal is being received, it will flash that LED also.

There is quite a bit of stuff to cram into the small enclosure, but I wanted to make it the same footprint as my PSU and LM4780 chip amp enclosures.



Will post a pic of it finished soon
__________________
Another project of mine: (a very big one at that!)
http://www.mp3car.com/vbulletin/show...5-pimping.html

Last edited by portreathbeach; 30th January 2013 at 08:10 PM.
  Reply With Quote
Old 31st January 2013, 11:30 PM   #107
diyAudio Member
 
Join Date: Jan 2010
Location: Cornwall
A few more pics:

Click the image to open in full size.

Inside of the rear panel


Click the image to open in full size.

Inside of the front panel


Click the image to open in full size.

The case with transformer, PSU board, relay board and microprocessor board


Click the image to open in full size.


Click the image to open in full size.

The 8 x TDA1543A parallel board attached to the lid (also used as a heat sink)


Should power it up tomorrow and test it
__________________
Another project of mine: (a very big one at that!)
http://www.mp3car.com/vbulletin/show...5-pimping.html
  Reply With Quote
Old 2nd February 2013, 11:21 PM   #108
diyAudio Member
 
Join Date: Jan 2010
Location: Cornwall
Powered up and tested this evening.....All working and sounding great.

Thanks for everyones help in this thread to complete my build


Last few pics:

Click the image to open in full size.

Click the image to open in full size.

Click the image to open in full size.


And here it is with my LM4780 chip amp and power supply.
__________________
Another project of mine: (a very big one at that!)
http://www.mp3car.com/vbulletin/show...5-pimping.html

Last edited by portreathbeach; 2nd February 2013 at 11:26 PM.
  Reply With Quote

Reply


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
HLLY DIY DAC ... is it any good ? dhbiker Digital Line Level 20 8th June 2012 09:18 AM
I can't find a good diy DAC kit under $300? seawalker Digital Line Level 4 13th April 2012 10:59 PM
Looking for a good DIY PCB kit - RS ones any good? Others? Morse Chip Amps 33 5th March 2009 02:38 PM
Good sound DIY DAC senee Digital Source 4 21st May 2008 09:12 AM
DIY DAC box, what would be good chips to use? wa2ise Digital Source 6 11th June 2005 05:40 AM


New To Site? Need Help?

All times are GMT. The time now is 12:43 AM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright 1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2