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Old 31st December 2012, 01:37 AM   #121
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toss them to jig and see what's Ugs for 2A

then you'll know everything ; after that , everything is just simple math

every time I start forgetting how to ride a bicycle , I make another round , and everything is back



just a general remark - regarding A CCS ; having Rs in range of 0R47 is ballpark of 1A5 Iq, per mosfet (considering governing bjt's PN constant of 0V65)

everything above 1A5 Iq is pushing the envelope

ya wanna more - decrease Rs

take a look at Babelfish J

give me 100SJEPs , will make ya 50 stereo Jango's , in a day
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Old 31st December 2012, 01:43 AM   #122
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I know what you mean, but these are supposed to be matched, so the fact that they are resulting in different bias is interesting, for lack of a better word. I remember in the F6 thread, Ilquam speaking of how transistors that were matched in standard way did not necessarily yield same results. Time will tell, as you say. Round and round we go
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Old 31st December 2012, 01:45 AM   #123
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they're matched , but how ?

certainly not where you want them

I would shoot on 2A , for my needs

for Jango - 1A
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Old 31st December 2012, 01:52 AM   #124
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2A is cooking and would not be ideal for FQA because of tempco, correct. Not quite as we'll behaved as SS. I do see the advantage of similar fets if for no other reason than their variation in bias due to heat.
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Old 31st December 2012, 06:15 AM   #125
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I'm increasingly skeptical of the term "matched". Remember this post Buzz?

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Old 31st December 2012, 09:04 AM   #126
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He was speaking of N to P, which is mor difficult. N to N is very possible, I'll get it sorted.
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Old 31st December 2012, 10:38 AM   #127
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Quote:
Originally Posted by Zen Mod View Post
.....
I would shoot on 2A , for my needs

for Jango - 1A
strictly speaking of SJEP

for Aleph CCS - who cares

put IRFP150 there , one piece (with halved Rs) and enjoy
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Old 31st December 2012, 10:41 AM   #128
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Yeah, Yeah. I was asking reasoning as further explanation.

Babelfish J is basically same configuration with different variation of CS.

That, of course, leaves the dual SS as the only other difference.
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Old 31st December 2012, 10:54 AM   #129
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sorry mate

I'm not preachin' ya ( it's ever never my intention )

just trying to give you more perspective
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Old 31st December 2012, 10:57 AM   #130
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Quote:
Originally Posted by buzzforb View Post
2A is cooking and would not be ideal for FQA because of tempco, .....
small (governing) bjt is there , to take care of everything

irrelevant what's tempco of working part - made of jelly , or silicone or germanium , as long it is in SOA
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