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First Watt J2 installed
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Old 14th October 2017, 07:11 AM   #61
samoloko is offline samoloko  Bulgaria
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Quote:
Originally Posted by JeffYoung View Post
Well the good news is another member came through and sold me some for considerably less than $122.

The bad news is they were still considerably more than Nelson's $10.
I am Interested at that offer
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Old 14th October 2017, 07:54 AM   #62
Tazzz is offline Tazzz
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I noticed some of the 2sk1530:s I have have do have a rather steep Id vs Vgs slope so here is a quick comparision between a semisouth jfet a high gm 2sk1530 and a high gm irfp240. (stated for delta 1.4<->1.6A)

(note: for the mosfet theese are pretty much the highest measuring parts out of a few hundred of each.. so likely almost as rare as semisouths)

Seems also the crss and coss are not so terrible either for the 2sk1530 but it hard to compare the plots in the lower voltage range against the semisouth.

Might try them out in a J style circuit, have not looked at thermal stability tough.
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Last edited by Tazzz; 14th October 2017 at 07:57 AM.
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Old 14th October 2017, 11:05 AM   #63
2 picoDumbs is offline 2 picoDumbs  Australia
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That's much higher than the data sheet would suggest it should be.
Interesting.
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"If you leave this point unattached to some circuitry, an ideal constant current source will emit a small lightning bolt which will travel until it connects to something." Nelson Pass
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Old 14th October 2017, 11:42 AM   #64
Tazzz is offline Tazzz
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Well it's also possible I should check the calibration....

Anyways the relative performance should be accurate.

Last edited by Tazzz; 14th October 2017 at 11:53 AM.
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Old 14th October 2017, 04:20 PM   #65
JeffYoung is offline JeffYoung  Ireland
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First Watt J2 installed
Quote:
Originally Posted by samoloko View Post
I am Interested at that offer
Hi samoloko,

I'm afraid I bought all he had and will be sharing them with one other gentleman who contacted me earlier.

Hopefully another member has some spare and will step out and make you an offer....

Cheers,
Jeff.
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Old 14th October 2017, 04:31 PM   #66
samoloko is offline samoloko  Bulgaria
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thank you Jeff
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