Go Back   Home > Forums > Amplifiers > Pass Labs

Pass Labs This forum is dedicated to Pass Labs discussion.

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 6th November 2005, 04:14 PM   #1
diyAudio Member
 
Carondimonio's Avatar
 
Join Date: Jun 2004
Location: Bern
Default My Aleph-X compact PCB

Hi all,

as I would like the enter the "Alephworld", I' ve designed an Aleph-X PCB.
Due to the constraints of my PCB Editor (Eagle demo Version), the board is very compact (4" x 3.20"), and it' s not been very easy to stuff all the components on it.

Now, given that I'm not that experienced in PCB design, I would like to hear the opinion of the more knowledgeable people on this forum.
Suggestions, constructive critics, flames are all most welcome!

Cheers,

Bruno
Attached Images
File Type: gif alephx.gif (39.1 KB, 4090 views)
  Reply With Quote
Old 6th November 2005, 04:15 PM   #2
diyAudio Member
 
Carondimonio's Avatar
 
Join Date: Jun 2004
Location: Bern
And here' s the driver board (4" x 1.80"):
Attached Images
File Type: gif alephpd.gif (13.2 KB, 3475 views)
  Reply With Quote
Old 6th November 2005, 06:07 PM   #3
acaudio is offline acaudio  Germany
diyAudio Member
 
Join Date: Sep 2004
Location: Germany
very nice
  Reply With Quote
Old 6th November 2005, 08:30 PM   #4
diyAudio Member
 
Join Date: Nov 2004
Location: Bruchsal/Germany
Super ! javascript:smilie('')

this is a real Mini-Amp and also suitable for a X-Headphone Amp .
congrats and greetings from germany

Jürgen
  Reply With Quote
Old 6th November 2005, 10:16 PM   #5
diyAudio Member
 
mpmarino's Avatar
 
Join Date: Jun 2004
Location: Crunchville, where I don't fit in.
<ahem><ahem> Looks good but if you post the .brd file I could get a much better look. <ahem>
__________________
Crazy Yankee.
  Reply With Quote
Old 7th November 2005, 03:56 AM   #6
grataku is offline grataku  United States
diyAudio Member
 
Join Date: Dec 2000
Location: -
This is pretty much identical to the 3yo standard AX board that just about everyone around here either owns or has seen.
Since everthing appears to be laid out in about the same place, if there are no mistakes, it should work.
If you are trying to actually build the amp for cheap a few people should have a bunch of the board stashed away somoene should be able to sell you a pair for no more than five dollars each. These are 4 oz Cu with the solder mask and the works. You can beat that.
Unfortunately, I am all out of mine.
  Reply With Quote
Old 7th November 2005, 06:40 AM   #7
diyAudio Member
 
Carondimonio's Avatar
 
Join Date: Jun 2004
Location: Bern
Hi all!

Thanks a lot for all the answers, it' s nice to be part of such a great community!


Quote:
Originally posted by grataku
This is pretty much identical to the 3yo standard AX board that just about everyone around here either owns or has seen.
Since everthing appears to be laid out in about the same place, if there are no mistakes, it should work.
Well, given the intrinsic, simmetrical structure of the Aleph-X, I guess it would be quite difficult/illogical to lay out the parts in a totally different way. Nevertheless, there' s one difference: I added a heatsink for the input MOSFETs, to improve the thermal coupling. I know, in previous threads it has been said this is not necessary, but it makes me feel better...

Quote:
Originally posted by grataku
If you are trying to actually build the amp for cheap a few people should have a bunch of the board stashed away somoene should be able to sell you a pair for no more than five dollars each.
Well, I' m not trying to build it for cheap (although I do not even want to spend a fortune), my primary goal is really to build a good amp AND to improve my personal PCB design skills. Moreover, reading other threads, it looks like there' s not many of the previous boards left, as there are other people looking for them without apparent success.

Cheers,

Bruno
  Reply With Quote
Old 7th November 2005, 07:31 AM   #8
Nisbeth is offline Nisbeth  Denmark
diyAudio Member
 
Nisbeth's Avatar
 
Join Date: Jan 2001
Location: Denmark
Nice work Bruno!


/U.


EDIT: I also think it would be easier to inspect the layout in detail if I had the eagle files

EDIT2: I can see you forgot to smooth the angle of the trace to C3+
  Reply With Quote
Old 7th November 2005, 12:23 PM   #9
grataku is offline grataku  United States
diyAudio Member
 
Join Date: Dec 2000
Location: -
Bruno,
the heatsink is absolutely unnecessary, I put a silpad and sqeezed the two mosfet together using a nylon screw.
These two will start dissipating enough to require heatsinking at around +/- 30V supply. You want them to get a little warm so that their temp. doesn't track RT and make the DC offset too enviroment dependent. The space would be put to better use by the addition of two nice PP input caps. which, on the other hand, I found to be absolutely necessary.
  Reply With Quote
Old 7th November 2005, 08:46 PM   #10
diyAudio Member
 
Carondimonio's Avatar
 
Join Date: Jun 2004
Location: Bern
Default 2nd Version

Hi all,

thanks to you all for your comments!

I was thinking that it would be nice to have on the PCB also the two 33R, 3W resistors from output to gnd, so... well... here' s the 2nd version of the board. Any comments?

Quote:
Originally posted by grataku
Bruno,
the heatsink is absolutely unnecessary, I put a silpad and sqeezed the two mosfet together using a nylon screw.
These two will start dissipating enough to require heatsinking at around +/- 30V supply. You want them to get a little warm so that their temp. doesn't track RT and make the DC offset too enviroment dependent. The space would be put to better use by the addition of two nice PP input caps. which, on the other hand, I found to be absolutely necessary.
Hi grataku, thanks a lot for your valuable input!
Well, if I do not want to use the heatsink I can always bend the pins of the two mosfets in order to squeeze them together.
As for the input caps, do you think they' re necessary if the preamp already has some caps on the outputs?

Cheers,

Bruno
Attached Images
File Type: gif alephx-2nd.gif (40.3 KB, 2954 views)
  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
Aleph-X Compact PCB Group Buy Carondimonio Group Buys 163 15th November 2008 05:32 PM
WTB: aleph-x compact PCB ashaw Swap Meet 0 23rd March 2008 08:24 AM
Compact supply.... notaclue Power Supplies 5 4th April 2006 12:33 PM
Compact sub DocLorren Subwoofers 11 8th January 2005 12:34 AM
Compact Aleph 5 module OliverD Pass Labs 22 19th March 2004 09:12 AM


New To Site? Need Help?

All times are GMT. The time now is 02:26 PM.


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