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Old 9th April 2012, 06:50 PM   #1
yero is offline yero  United States
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Default SIT power jfet

Could a thread be started for the semisouth sjep120r100a which is now available at Newark. Can this power jfet be implemented in Mr. Rothacher latest design as a direct subsitute?
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Old 9th April 2012, 06:51 PM   #2
qusp is offline qusp  Australia
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I dont think it really warrants another thread, yes it can be swapped in; they are practically identical
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Old 9th April 2012, 06:54 PM   #3
Zen Mod is offline Zen Mod  Serbia
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E means enhanced

you need SJDP for direct implementation in MR's schm

but , E is doable easy , too - just look at Papa's Arch Nemesis article ........ or maybe is biasing of it already covered in MR's thread
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Old 9th April 2012, 07:04 PM   #4
qusp is offline qusp  Australia
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doh, sorry I completely missed the E as I hadnt seen this (new?) part. i just read as the A in R100A being the heart of the question

thanks for the catch ZM
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Old 9th April 2012, 07:08 PM   #5
generg is offline generg  Germany
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Quote:
Originally Posted by yero View Post
Could a thread be started for the semisouth sjep120r100a which is now available at Newark. Can this power jfet be implemented in Mr. Rothacher latest design as a direct subsitute?
The SIT 2SK82 from acronman Singapore and the SS depletion have a similar price....

Why not take the SIT......and get triode characteristic!
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Old 9th April 2012, 07:30 PM   #6
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2SK82 from acronman Singapore delivered in 10 days to US east coast.
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Old 9th April 2012, 07:35 PM   #7
yero is offline yero  United States
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Default SIT

I thought the SS sjep120r100a was the j fet that provides triode characteristics? Could you please eleborate on this subject. Yero
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Old 9th April 2012, 08:14 PM   #8
generg is offline generg  Germany
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When you want to take Semisouth you must look what Zen Mod wrote
....
You must take the depletion mode type R85 (?)?... instead of original SIT 2SK82.

As far as I understand the SJDPR85 is at lower currents triodish and the 2SK82 really behaves like triode.

Only disadvantage less power handling and TO-3 case, means a bit difficult for our flat big heatsinks we are used to....

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Old 9th April 2012, 10:35 PM   #9
qusp is offline qusp  Australia
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nope, the R100 has been covered in the circlotron article, Michael actually did a revision for the all jfet version and it does actually use the E version
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Old 9th April 2012, 10:37 PM   #10
qusp is offline qusp  Australia
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ahh its huge!! its covering the edit button too so I can delete and resize. I just linked directly to his DIYA blog

now it behaves, after i've reported my own post. oh well its still not really suitable. sorry guys when I came back I could see the edit button again

Last edited by qusp; 9th April 2012 at 10:39 PM.
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