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20th January 2013, 08:44 PM
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#1 |
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1.21 Gigawatts?!
diyAudio Member
Join Date: Apr 2009
Location: San Francisco
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IRFP240 source?
Are the IRFP240s becoming scarce now? I couldn't find them on mouser or anywhere else "reputable." Any suggestions for where to get these? Maybe my mouser search was bad? Or maybe someone has had good luck with a particular ebay seller? I'm looking to get quite a few so I can match them myself.
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20th January 2013, 09:01 PM
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#4 | |
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1.21 Gigawatts?!
diyAudio Member
Join Date: Apr 2009
Location: San Francisco
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Quote:
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20th January 2013, 09:03 PM
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#5 |
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1.21 Gigawatts?!
diyAudio Member
Join Date: Apr 2009
Location: San Francisco
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While I'm on the topic... Any guidance on what number you need to purchase to get good matches? Let's say you need to match 4 closely. You need to buy... 20?
Similar question on the IRF9610s although I would guess the answer would be about the same.
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20th January 2013, 09:19 PM
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#6 |
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diyAudio Member
Join Date: Apr 2002
Location: Llanddewi Brefi, NJ
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Depends upon how closely you want them to match -- if you purchase a tube you should get enough devices for 2x 4 sets +/- 0.02V.
I found that within a tube, when you match for Vgs the transconductances generally line up pretty well. |
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20th January 2013, 09:22 PM
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#7 |
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1.21 Gigawatts?!
diyAudio Member
Join Date: Apr 2009
Location: San Francisco
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Sorry for the newb question, but how many in a tube?
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20th January 2013, 10:29 PM
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#8 | |
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diyAudio Member
Join Date: Oct 2009
Location: Ann Arbor Michigan
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"My desire for knowledge is intermittent; but my desire to bathe my head in atmospheres unknown to my feet is perennial and constant". --- Thoreau |
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21st January 2013, 12:06 AM
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#9 |
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diyAudio Member
Join Date: Oct 2003
Location: Newington, CT
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I've used these as an alternative to the irfp240, they work pretty well. You should have no problem matching 4pcs within a tube, I'd be skeptical purchasing semis from ebay; matched or otherwise.
FQH44N10_F133 Fairchild Semiconductor | Mouser Last edited by MEGA-amp; 21st January 2013 at 12:09 AM. |
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21st January 2013, 12:41 AM
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#10 |
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The one and only
Join Date: Mar 2001
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You need matches only for the ones in parallel. Most of the time 0.1V
at the operating point is good enough, and you can probably get 5 groups of 4 out of a tube. 
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