aleph1.2 IRF240 vs IRFP250 - 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 30th March 2007, 10:21 AM   #1
diyAudio Member
 
Join Date: Mar 2007
Default aleph1.2 IRF240 vs IRFP250

more words has spend about a mached mosfet, but the capacitance of gate is than more important in audio responce?

it' very easy mount a irfp250 in to247, the to3 case need too much drill-wole.....

what thing about???
  Reply With Quote
Old 31st March 2007, 04:07 AM   #2
diyAudio Member
 
Join Date: Feb 2001
Location: Columbia, SC
I'm not clear what the question is.

Grey
  Reply With Quote
Old 31st March 2007, 06:44 AM   #3
diyAudio Member
 
MEGA_amp's Avatar
 
Join Date: Oct 2003
Location: CT
You could try the IRFP240, its a TO-247 package. I could be wrong here but I believe you could use say 10 pairs of outputs vs. the original 12, to offset gate capacitance issues.

-john
  Reply With Quote
Old 3rd April 2007, 01:02 PM   #4
diyAudio Member
 
Join Date: Mar 2007
the question is:

12 pair of IRF240 in to3 case as output stage is similar to mount 12 pair of IRFP250, the gate capacitances has a limit in aleph1.2?
anyone has tested or listed a differences?
thanks
  Reply With Quote
Old 3rd April 2007, 01:15 PM   #5
diyAudio Member
 
mpmarino's Avatar
 
Join Date: Jun 2004
Location: Crunchville, where I don't fit in.
I am not looking at a datasheet but I thought the IRFx250 was a bigger die than the IRFx240. Higher curent AND higher capacitance. Maybe you could get away with using less of them. This is only from memory .
__________________
Crazy Yankee.
  Reply With Quote
Old 4th April 2007, 07:43 AM   #6
diyAudio Member
 
Join Date: Mar 2007
have right, irfp have more gate capacitance, but are more easy to mount. was wondering for how much current and then how much make out can pilot with the first stadium of aleph1.
sorry for my english
  Reply With Quote
Old 4th April 2007, 09:49 PM   #7
diyAudio Member
 
Join Date: Feb 2001
Location: Columbia, SC
There's more to it than just Gate capacitance and current capability. You need to keep an eye on the power dissipation.
Also, don't immediately assume that lower Gate capacitance is always better. It depends on the circuit and the application.

Grey
  Reply With Quote
Old 5th April 2007, 06:34 AM   #8
diyAudio Member
 
Join Date: Mar 2007
but sharpen she makes out minor should extend the band and the answer of the pilot stadium, and not to load the driver but to give back the whole possible linear piu frequency range.
  Reply With Quote
Old 5th April 2007, 06:47 AM   #9
diyAudio Member
 
Join Date: Mar 2007
I would like to avoid mounting 48 metal irf240 in to3, while I can choose to mount the same number of irfp250 to their place in to247, with remarkable advantages in terms of assembly and current, but not in make out of gates, while he remains the doubt of as it can worsen the sound of all the amplifier.
evaluates that all the amplifier assumes remarkable dimensions, a lot of to be become a monolith arranged in the lounge.
the measurements correct in cm are 160 high, 24 narrow, 40 deep, and higher than 40kg of weight, even if of wood and dark a remarkable visual impact always has.
  Reply With Quote
Old 5th April 2007, 07:14 AM   #10
EUVL is offline EUVL  Europe
diyAudio Member
 
Join Date: Oct 2003
It also took me a while to understand what the issue might be.

According to IRF website, IRFP240, which is TO247 plastic package, is now obsolete. The next closest in TO247 is indeed the IRFP250.

IRF240 (without P), which is TO3 metal can, is still active.

But I think if you are quick enough, you can still get enough IRFP240 in TO247 on the market, e.g.

www.reichelt.de
www.schuro.de

etc.


Patrick
  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
irfp250 application east electronics Solid State 9 11th April 2009 11:47 PM
IRFP250 die size djQUAN Solid State 4 24th July 2004 04:32 PM
Irfp250, Irfp9240, Rifa kims Swap Meet 1 30th April 2004 06:37 AM
Aleph-4 with IRFP250 ruangrit Pass Labs 1 3rd January 2004 09:06 AM
I have a lot of IRFP240 IRFP250 to sell! Cephas Swap Meet 0 23rd June 2002 11:26 AM


New To Site? Need Help?

All times are GMT. The time now is 03:54 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