new irfp mosfets

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elviukai

elviukai

Member
Joined 2003
highend.projektas.lt/
hello guys, what is the best choise for aleph 3/30?
here is no 244. but are theese:



IRFP064N (MOS-N-FET 55 V 110 A 200 W 0,008 Om TO-247)

IRFP140 (MOS-N-FET 100 V 27 A 140 W 0,052 Om TO-247)

IRFP150 (MOS-N-FET 100 V 40 A 230 W 0,06 Om TO-247)

IRFP260 (MOS-N-FET 200 V 46 A 280 W 0,055 Om TO-247)


or 240???

I am thinkingo of 064 model at a price?

any help is welcome..
 
D

Dennis Hui

Member
Joined 2002
Paid Member
The IRFP240 is a good general purpose choice
and I seem to remember it being also one of
the cheaper ones. You can buy a bunch and be
building different Alephs and Zens for quite a
while. :)

That said, my A30 uses IRFP044's since I
happen to have them on hand and they
worked fine. I wouldn't use them with
higher voltage rails though.

Cheers,
Dennis
 
Nelson Pass

Nelson Pass

The one and only
Joined 2001
Paid Member
Odd, I posted a reply and later couldn't find it.

In any case, I have pointed out before that the IRF250 is
a bit like two IRF240's in parallel, and the same is true of the
150 / 140. It has more transconductance and capacitance
and dissipation capability.

If you want to use it instead of a 140 / 240, then consider
using fewer in parallel, otherwise there is a bit of spectral
shift toward the bottom end. If you want better bass, that's
a fine way to get it. :cool:
 
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R

rtirion

Member
Joined 2000
Jan,

Mr. Pass summed it up perfectly. And before I started building
the Aleph I "auditioned" a few different FETS in a pair of ZEN's.
To me IRFP150 was the winner, closely followed by IRFZ044N.
The later is in TO220 package.

I have also used them (the 150's) in two Aleph-X's.

Regards
 
L

Leeuwarden

Member
Joined 2002
Nelson Pass said:

In any case, I have pointed out before that the IRF250 is
a bit like two IRF240's in parallel, and the same is true of the
150 / 140. It has more transconductance and capacitance
and dissipation capability.
Click to expand...


A 150 has more dissipation capability. This means that it get's less hot if used instead of a IRF240? Or described in another way: if you use 6 IRF150's in an Aleph 5, you need less heatsinking?

Jan
 
Nelson Pass

Nelson Pass

The one and only
Joined 2001
Paid Member
metalman said:
Anyone have any thoughts on the IRF640N? Transconductance of 8.8 S and C(iss) of 1300 pF.
Click to expand...

They all work. Each has its own little character, like wine made
from grapes grown on other side of the hill.

The bigger chips start shifting the sound spectrally, putting more
emphasis on the bottom than top. This can be compensated
by using fewer, but in the end, it's season to taste. :cool:
 
B

bluevas

Banned
Joined 2007
IRFP250 for Aleph

Thank you Mr. Pass.
Now I will search the post about Aleph's clone schematics. There are many posts about Aleph's. Since from Grey for Mini Aleph and Brian GT, there are many schematics, different value for the resistors. Please help me which thread should i follow exactly because I plan to build Aleph with IRF250 with single side pcb.

Thank you guys.

Best regards,

Josh
 
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