Need DigiKey PN for 9610 heatinks for Aleph 2 boards - Page 2

Brian Donaldson · 5th January 2004, 04:51 AM

Correct. All 12 fets (6 via source resistors) all connect together through the yellow wire in Dale's Aleph boards. I added a peice of 12 ga solid copper wire over the trace that connects the sources on one side to the drains on the other.
I was after a little more power, so I have 16 fets and .68 ohm source resistors to give around double the bias barring ang other component changes. I also installed a pot for r19 to adjust the bias.

tomchaoda · 5th January 2004, 04:41 PM

Quote:

The chokes started to stink. They were replaced with big 2 ohm resisters.

Brian:

Can you elaborate a little bit about this? I thought the CLC is always the better way to reduce the AC ripples!

Thomas

Brian Donaldson · 6th January 2004, 12:31 AM

But it's hard for a choke to dissapate 50 watts and not self destruct. They had a little over 2 ohms resistance and 5A flowing through.
I've been toying with the idea of using a source follower Zener diode regulator like the zen preamps(I don't remeber which one). but since the amps pull a constant current, the resistor will do for now.
I Know I'm a dumb *** some times. I thought that since they were air cores, they couldn't saturate. But I forgot to consider the ESR would mean 10v drop at 5A.

Jean · 6th January 2004, 02:51 AM

Brian, what ga inductors did you use ? I plan on using Solen 14ga inductors.

nbaula · 6th January 2004, 03:47 AM

Thanks!Brian I think I understand it now.

Brian Donaldson · 6th January 2004, 09:38 AM

I Think they were 16 ga. I remeber thinking "yea, 16 ga can carry 6 amps, no problem. The problem is 100' if 16 ga rolled up so there is no surface area exposed to the air for cooling. I would guess that you need to see less than .75 ohms or so to keep the temp down in the core. I also would not recomend home wound units because the layers are not rolled tight enough to cunduct the heat from the middle layers to the surface. Or maybe pot them in some thermally conductive epoxy to a heat sink?

6th January 2004, 02:51 AM	#14
Jean diyAudio Member Join Date: Mar 2002 Location: Sacramento, CA	Brian, what ga inductors did you use ? I plan on using Solen 14ga inductors. __________________ left lane is for passing, slower traffic keep right please.

Thread Tools	Search this Thread
Show Printable Version Email this Page	Search this Thread: Advanced Search

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
L/R Boards and Matched IRFP240 Boards for Aleph/ A-X	lgreen	Swap Meet	7	25th August 2009 04:56 AM
FS: Aleph 30 kit / 4 Heatinks 6x6x3	Bengali	Swap Meet	7	3rd June 2009 09:02 PM
Pass Aleph 1.7 boards, Zhaolu 2.5A, P700 VRDS, UGS PS boards, dac chips	analog_sa	Swap Meet	4	14th March 2009 05:29 PM
WTB: Aleph Output boards/Aleph-X	rchua77	Swap Meet	0	31st March 2008 04:56 AM
Can I use Brian GT's Aleph boards for a Aleph 1.2	raincheck	Pass Labs	2	27th May 2002 02:21 PM

New To Site?	Need Help?
Register to Participate Search Privacy Statement Contact Us	Frequently Asked Questions Did you forget your password? Mark Forums Read


	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

5th January 2004, 04:51 AM	#11
Brian Donaldson diyAudio Member Join Date: Jan 2003 Location: Texas, Love it or leave it	Correct. All 12 fets (6 via source resistors) all connect together through the yellow wire in Dale's Aleph boards. I added a peice of 12 ga solid copper wire over the trace that connects the sources on one side to the drains on the other. I was after a little more power, so I have 16 fets and .68 ohm source resistors to give around double the bias barring ang other component changes. I also installed a pot for r19 to adjust the bias.

6th January 2004, 12:31 AM	#13
Brian Donaldson diyAudio Member Join Date: Jan 2003 Location: Texas, Love it or leave it	But it's hard for a choke to dissapate 50 watts and not self destruct. They had a little over 2 ohms resistance and 5A flowing through. I've been toying with the idea of using a source follower Zener diode regulator like the zen preamps(I don't remeber which one). but since the amps pull a constant current, the resistor will do for now. I Know I'm a dumb *** some times. I thought that since they were air cores, they couldn't saturate. But I forgot to consider the ESR would mean 10v drop at 5A.

6th January 2004, 03:47 AM	#15
nbaula diyAudio Member Join Date: Mar 2002 Location: Daly City California USA	Thanks!Brian I think I understand it now.

6th January 2004, 09:38 AM	#16
Brian Donaldson diyAudio Member Join Date: Jan 2003 Location: Texas, Love it or leave it	I Think they were 16 ga. I remeber thinking "yea, 16 ga can carry 6 amps, no problem. The problem is 100' if 16 ga rolled up so there is no surface area exposed to the air for cooling. I would guess that you need to see less than .75 ohms or so to keep the temp down in the core. I also would not recomend home wound units because the layers are not rolled tight enough to cunduct the heat from the middle layers to the surface. Or maybe pot them in some thermally conductive epoxy to a heat sink?

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)