New Aleph Mini PCB GB - Page 13 - diyAudio
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 14th March 2005, 01:29 PM   #121
diyAudio Member
 
Russ White's Avatar
 
Join Date: Jan 2005
Location: Nashville, TN, USA
Send a message via Yahoo to Russ White
Default My vote is for seperate power stage PCBs

I agree with Brian, without active cooling It is looking like you would have to have monster heatsinks probably with copper heatspreaders or active cooling to pull off a safe amp with Peter's PCB if you mounted all 6 devices on the PCB. While this does not preclude using Peter's design by any means, I think Brian's design is more accessible and practical to a broader set of users. Both are so cool though.
  Reply With Quote
Old 14th March 2005, 02:19 PM   #122
diyAudio Member
 
Peter Daniel's Avatar
 
Join Date: Jul 2002
Location: Toronto, Canada
Send a message via AIM to Peter Daniel
I think the solution to that is very simple. Since my board is about the same size as Brian's Aleph Mini board (yet still allows functionality of both A30 and A mini), all it needs is additional output boards for broader (and more thermally efficient) applications. This way you will have the best of both. I'd like to note that although my board allows all 6 Mosfets (and power resistors on board), the front end section layout is not compromized in any way because of that. I actually think it has some advantages.

As to the output boards, I would see them as rows of 6 devices, which can be broken in half, if only 3 per side are needed. This would give a choice to people getting one board for two channels or one per channel for more power. There would be 2 output boards per set.

I'm not gonna mention here possibilities of applying the boards to Aleph X as well

Still, no matter what verdict in here is, I will produce my board anyway, as I believe it's a way to go with a small Aleph. I did a drawing, showing 6 devices mounted, with copper spreaders (which definitely would be very advantegous). As you can see, the size is about right for R-theta heatsinks ( 6" x 11") which are perfect for one channel of Aleph 30.
Attached Images
File Type: jpg a33.jpg (52.3 KB, 2277 views)
__________________
www.audiosector.com
“Do something really well. See how much time it takes. It might be a product, a work of art, who knows? Then give it away cheaply, just because you feel that it should not cost so much, even if it took a lot of time and expensive materials to make it.” - JC
  Reply With Quote
Old 14th March 2005, 02:57 PM   #123
diyAudio Member
 
Peter Daniel's Avatar
 
Join Date: Jul 2002
Location: Toronto, Canada
Send a message via AIM to Peter Daniel
I don't really see advantages in a wider pcb. It's harder to implement, the traces are longer, and for some reason it looses the appeal.

Everybody was commenting on Brian's original Aleph Mini as beautiful and cute creation. Well, I want to create something like that with Aleph 30.

And I'm trully not concerned with heat problems. With copper spreaders it will run cooler than with bigger board without spreaders.
__________________
www.audiosector.com
“Do something really well. See how much time it takes. It might be a product, a work of art, who knows? Then give it away cheaply, just because you feel that it should not cost so much, even if it took a lot of time and expensive materials to make it.” - JC
  Reply With Quote
Old 14th March 2005, 04:12 PM   #124
steenoe is offline steenoe  Denmark
diyAudio Member
 
steenoe's Avatar
 
Join Date: Mar 2004
I can't help thinking that Brians layout is more simple to implement. If this is to reach a broader audience, I dont think copperspreaders wil be appealing (to most ppl) Also if the output boards are to be used in Peters design, you would have to leave out 14 resistors on each board. Also there would have to be 2x4 clearly marked pads on each board, for taking the leads to the outputboards. Unless you mean to take out 18 leads from each pcb.
So for the groupbuy, my vote is still for Brians layout. BTW, Peters layout is quite amazing, with all that stuff fitted on that little pcb And cute it is, for sure As for the heat, I was playing a little this weekend. It occured to me that I had all the stuff lying around for a ZenV1 amp. I stumbled over a pcb for it I couldn't resist and did put it together. The chassis is my "play" chassis
Considering this is 2x10 watts, the amp runs amazingly hot. The sinks not being huge, but not excactly small either, I was stunned about the temp it ran at. One Fet per sink! I would never mount three on each of them. Have a look .

Steen.
BTW it sounds great, except for the psu ripple that spills over at the output. I intend to get rid of that though.
Attached Images
File Type: jpg top_for.jpg (74.1 KB, 2193 views)
  Reply With Quote
Old 14th March 2005, 04:21 PM   #125
diyAudio Member
 
Hanzwillem's Avatar
 
Join Date: Nov 2002
Location: Hengelo, The Netherlands
I agree with Peter, I had no problems with one of my Zens dissipating 100W per channel on huge heatsinks with the only 2 mosfets which were fairly close together. With the A30 this dissipation is shared between 6 FETs so the junction temperature will be even lower. If one still think it gets too hot one can always decrease bias current... there are plenty of topics on how to do that
  Reply With Quote
Old 14th March 2005, 04:47 PM   #126
diyAudio Member
 
Peter Daniel's Avatar
 
Join Date: Jul 2002
Location: Toronto, Canada
Send a message via AIM to Peter Daniel
Quote:
Originally posted by steenoe
Unless you mean to take out 18 leads from each pcb.
Actually it's only 7 wires, if you want to spread the mosfets: you leave mosfets on one side on the board, all resistors stay on board as well, and you place only 3 mosfets outside the board. You will need 3 wires to connect gates, 3 wires to sources, and one wire for shared power rail.

How many wireas are used with Brian's layout?
__________________
www.audiosector.com
“Do something really well. See how much time it takes. It might be a product, a work of art, who knows? Then give it away cheaply, just because you feel that it should not cost so much, even if it took a lot of time and expensive materials to make it.” - JC
  Reply With Quote
Old 14th March 2005, 04:54 PM   #127
jleaman is offline jleaman  Belgium
Banned
 
Join Date: Apr 2002
Send a message via AIM to jleaman
I think we should make both. The reason i like the mini a is because 10watts in class a is plenty for me. ALso these mini a's that brian built are on there way to me. I believe the board that peter are awesome but are to close together If peter was to make teh board cut'able to mount the fets on the heatsink away from the main board it would be good. My intention here is to provide a kit small for people that are not ritch to build a aleph 2 1 or 3 these boards are small cheap and easy to build Im thinking seriouly about selling all my aleph 2 parts except heat sinks. that is 2 x 1kva victoria magnetic's transformers all the caps 2 brian gt main boards fully stuffed the output boards the binding postes and a few other goodies. so i can build up 6 channels of the mini'a's 3 per speaker as mine are going to be tri'amped..It's sad that i spent a fortune on my Aleph 2's but in the end i think tri'amping would sound better.
  Reply With Quote
Old 14th March 2005, 05:04 PM   #128
diyAudio Member
 
Peter Daniel's Avatar
 
Join Date: Jul 2002
Location: Toronto, Canada
Send a message via AIM to Peter Daniel
I'm also coming to conclusion that we should run both offerings. It seems like there are people who prefer one over the other, and I would suspect it's about 50/50 split.

Brian and Jason can go on with their boards as part of a group buy, and I will offer the boards on basis of individual inquiries.

I already have seen interest in at least 30 of them, so I'm pretty sure that whatever I invest will show return. I will match the prices with the group buy offering.
__________________
www.audiosector.com
“Do something really well. See how much time it takes. It might be a product, a work of art, who knows? Then give it away cheaply, just because you feel that it should not cost so much, even if it took a lot of time and expensive materials to make it.” - JC
  Reply With Quote
Old 14th March 2005, 05:12 PM   #129
jleaman is offline jleaman  Belgium
Banned
 
Join Date: Apr 2002
Send a message via AIM to jleaman
Id like a pair too TO try out : O )

Maybe you should start a group buy for both Peter : O ) Ill control the mini a's and you control the a30's
  Reply With Quote
Old 14th March 2005, 05:28 PM   #130
diyAudio Member
 
Peter Daniel's Avatar
 
Join Date: Jul 2002
Location: Toronto, Canada
Send a message via AIM to Peter Daniel
You see, usually the reason for creating group buy is to make sure that whatever you order from manufacturing place will be sold and you are not loosing any money.

In case of those Aleph 30 boards, I'm pretty shure that whatever I have in stock will be sold anyway, so I don't really need a group buy assurance.

I will just order the boards, and when they bacome available, I will be selling them to whomever is interested. The price will reflect pretty much my cost.

Group buys had recently gained bad reputation, that's why I'd rather avoid being associated with one

I can have the boards ready in 10 days.
__________________
www.audiosector.com
“Do something really well. See how much time it takes. It might be a product, a work of art, who knows? Then give it away cheaply, just because you feel that it should not cost so much, even if it took a lot of time and expensive materials to make it.” - JC
  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
mini-aleph versus aleph-3 rmgvs Pass Labs 7 4th February 2010 03:18 PM
Mini Aleph Board & Aleph 2 Parts List gpsmithii Pass Labs 3 16th January 2010 03:58 AM
Aleph Mini / Aleph 3 PCB ready (?) croccodillo Pass Labs 5 27th July 2009 01:51 PM
Difference between Aleph J and Aleph J Mini ppmmcc Pass Labs 5 17th May 2008 06:10 PM
WTB: Aleph-mini PCBs and transistor set for Aleph 30 needtubes Swap Meet 4 6th November 2005 06:29 PM


New To Site? Need Help?

All times are GMT. The time now is 03:34 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