Aleph-X pcb groupbuy - Page 2 - diyAudio
Go Back   Home > Forums > Commercial Sector > Group Buys

Group Buys Members group buys

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 20th October 2004, 06:01 AM   #11
diyAudio Member
 
mpmarino's Avatar
 
Join Date: Jun 2004
Location: Crunchville, where I don't fit in.
Quote:
What do you guys plan to use?
I plan on building a 4 channel...I know, I know..a heat monster. I am going to use the Iron transformer in pic. An easy 3kva item. it has primaries that allow a few voltages including 20+20. Tranny will be shielded in copper in the chassis.(I have an uncle that specializes in copper roofing!) I'm prob gonna locate some 53a Ixys bridges.

A lot of guys prob won't like this idea...but...I have 4 - 7"x15" heatsinks that I'm considering arrainging in a 'wind tunnel' configuration. I have some 24 volt 6" brushless fans that are super quiet at 7-10v or so, and don't seem to need a kickstart.

Yeah, a hairdrier.

Probably use 12 IRFP244 per channel ? Transformer has only one set of secondaries but will run 2 bridges per 2 channel amp with around 100,000uf per amp.

I probably won't get too 'high end' on most of the components as I am quite frankly - cheap.

This will probably only take me a few years to get done....
Marc
Attached Images
File Type: gif picture.gif (76.8 KB, 960 views)
  Reply With Quote
Old 20th October 2004, 07:23 PM   #12
diyAudio Member
 
kilowattski's Avatar
 
Join Date: Aug 2003
Location: Long Island, New York
I certainly have no problem with anybody using a fan. Your heatsinks will probably be cooler than mine. One question for you though. Are you going to run your amp at 220 VAC input? With 4 channels you will be close to exceeding 15 amps draw from your ac line at 120 VAC. You will also have to think about the enormous current that will be required at power up. Other than that, I always think bigger is better
__________________
-----------------------------------------------
Kilowattski
  Reply With Quote
Old 21st October 2004, 02:41 AM   #13
diyAudio Member
 
mpmarino's Avatar
 
Join Date: Jun 2004
Location: Crunchville, where I don't fit in.
Yes, well..120v would be used. Do you really think I will be looking at 15a continuous? I am aware I will be looking at solid continuous draw..but...I didn't realize it that high. Maybe I should have pulled out my calculator for a moment. ......

Kilowatski..thanks for pointing that out
  Reply With Quote
Old 21st October 2004, 03:17 AM   #14
diyAudio Member
 
kilowattski's Avatar
 
Join Date: Aug 2003
Location: Long Island, New York
With 20 vac secondaries and a simple capacitive filter of 100000uF you should have about 26 volt rails. you will be dissipating 1248 watts of heat alone. Get the Aleph X AXE-1 speadsheet and it will do the calculation for you. If the cumulative thermal resistance of your heatsinks were 0.1w/degrees C (which is terrific by the way) the temperature of the sinks would be 291 degrees F. I think you should also look into heavy duty water cooling because your power transistors would self destruct in a few minutes. Seriously, if you still decide to do 4 channels I suggest 4 separate chassis so the heat can be managed a whole lot easier.
__________________
-----------------------------------------------
Kilowattski
  Reply With Quote
Old 21st October 2004, 07:47 AM   #15
Kari is offline Kari  Sweden
diyAudio Member
 
Kari's Avatar
 
Join Date: Jan 2004
Location: Stockholm
Price update as of 21:st of October:

Driver/ccs board would cost 3USD/pc
Mainboard would cost 8USD/pc

However even more people have signed up after i sent the request for a quote so the prices are probably going to drop even more. Also the quote i got had separate shipping costs for both the mainboard and the driver/ccs, and i have now asked to ship both boards in the same package so this should also cut costs.

Thx,

Kari
  Reply With Quote
Old 21st October 2004, 10:24 AM   #16
diyAudio Member
 
kilowattski's Avatar
 
Join Date: Aug 2003
Location: Long Island, New York
Why not freeze these prices and donate any excess to diyAudio.com?
__________________
-----------------------------------------------
Kilowattski
  Reply With Quote
Old 21st October 2004, 10:25 PM   #17
Kari is offline Kari  Sweden
diyAudio Member
 
Kari's Avatar
 
Join Date: Jan 2004
Location: Stockholm
The price is now set.

8USD/pc for the mainboard and 3USD/pc for the driver/ccs board.

/Kari
  Reply With Quote
Old 21st October 2004, 11:02 PM   #18
Kari is offline Kari  Sweden
diyAudio Member
 
Kari's Avatar
 
Join Date: Jan 2004
Location: Stockholm
I have also been offered gold plating and that would cost a additional 5%. Mainboard 8*1.05 = 8.40USD and for the driver/ccs 3*1.05 = 3.15USD.

This would then be done on the whole order, ie. you cannot choose if you want goldplated or not.

What do you think about this? It would for sure look cool with red soldermask and goldplated pads.

/Kari
  Reply With Quote
Old 22nd October 2004, 12:24 AM   #19
Sander is offline Sander  Netherlands
diyAudio Member
 
Join Date: Oct 2004
Hi,

Gold plated looks fine to me. It probably only improve the looks, and the price isn't that much higher.

Does somebody know good information about a Power supply for the Aleph X? If read many many threads but I can't properly select good psu from bad psu's. I'm planning on ~75W in 4 Ohms. CLC, CRC, etc?
  Reply With Quote
Old 22nd October 2004, 03:13 AM   #20
diyAudio Member
 
kilowattski's Avatar
 
Join Date: Aug 2003
Location: Long Island, New York
It's ok with me. Thats pnly an extra $2 on top of the $40 for the whole set and it would sure look cool. I woild like to pay this weekend, have the shipping charges changed?
__________________
-----------------------------------------------
Kilowattski
  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
Dutch Aleph-X parts groupbuy Sander Group Buys 124 1st February 2009 05:39 PM
Aleph-X smaal EU "small-parts" groupbuy Sander Group Buys 3 3rd December 2008 12:48 PM
Pearl pcb size (from groupbuy) lykkedk Everything Else 3 16th April 2007 08:37 PM
2nd Aikido PCB and PSU groupbuy Bas Horneman Tubes / Valves 66 11th October 2005 10:56 AM
Groupbuy of transformers Kari Parts 0 17th February 2004 08:52 PM


New To Site? Need Help?

All times are GMT. The time now is 08:15 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