Semisouth SiC JFETs: SJEP120R100 or SJEP170R550 better for building amp? - Page 3 - diyAudio
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Old 14th April 2010, 07:07 PM   #21
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Comparing it to the IRFP240, it has comparable Coss and Crss
and about half the Ciss.

Place in an Aleph J type circuit, I have noticed about twice
the bandwidth.

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Old 14th April 2010, 08:39 PM   #22
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I was not able to drop the SS R100 right into the AJ clone with 240 as CCS.
I noticed the AJ 'type' circuit I dropped it into a Mini-A circuit, without too much trouble. I am not too sure what Ciss (less capacitance) means to changing the overall circuitry, if any.
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Old 14th April 2010, 09:11 PM   #23
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The R100 has a lower Vgs than the IRFP240, so you need to
lower the value of the resistance from the Drain of Q1 to V- in
to bias it correctly. I use a potentiometer there.

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Old 14th April 2010, 09:28 PM   #24
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Mike, also watch out for dc offset as you do this...
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Old 14th April 2010, 09:36 PM   #25
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and read all funny threads about these issues ......

why I have impression that we already beat to death that old same donkey ....



and we are always in Papa's footsteps

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Old 14th April 2010, 09:38 PM   #26
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I had the pot on R8, not R7 (which I beleive is what NP is recommending). DC offset was reasonable playing with R8 if I remember, but the front end I figured was not right. It would just thump, thump, thump when hooked up to a speaker.

Yes, I've learned to deal with DC offset without a cap at output I am learning a little bit.
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Old 14th April 2010, 09:43 PM   #27
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Quote:
Originally Posted by Zen Mod View Post
and read all funny threads about these issues ......

why I have impression that we already beat to death that old same donkey ....



and we are always in Papa's footsteps

I'd prefer to think of giving the donkey a new look and life. A little lipstick, and pretend it's a horse.
I'll freely admit to trying to get a good chip shot out of papa once in awhile. Helping me make it to the 18th hole.
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Old 14th April 2010, 10:36 PM   #28
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Should be on R7...

Do I hear Eddie Murphy braying...?!
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Last edited by Blues; 14th April 2010 at 10:36 PM. Reason: ?
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Old 31st August 2010, 04:40 PM   #29
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This article is a bit dated, but as an anecdotal note I find it quite entertaining: Semiconductor Today. It's also on semisouth's website: SemiSouth Laboratories, Inc. | News.
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Old 31st August 2010, 06:41 PM   #30
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I always appreciate it when they spell my name correctly.

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