Seems to me to be a logical step to fold half of an F5 into a circlotron and replace the output fets with Jfets.
I had some thoughts like that when I saw The Amazing FET Circlotron
No, the copper we see makes Circlotron sense. There is some skinny traces going off to the left that would only be an LED thingy. And, no big holes for pwr supply connections or speaker outputs... But, the "Ref1", "Ref2" and "Bias" is an important area I have not suceeded in developing enough stability in output offset. I think that is the biggest area to conquer. But, Biasing the 2 halfs into a semetrical complamentary/balanced behaviour is also important.
I wonder though? Is it posible to apply susy to these things???
I wonder though? Is it posible to apply susy to these things???
I wouldn't want you to think there's nothing behind the
curtain...
I wouldn't want you to think that I ever think that .....
Something to drool over...
Home Page | Stereophile.com scroll down...
Still under development Mr. Pass or will it make it to production soon? With PapaFETs?
Home Page | Stereophile.com scroll down...
Still under development Mr. Pass or will it make it to production soon? With PapaFETs?
I wouldn't want you to think there's nothing behind the
curtain...
I will take a guess and say, this is the output stage.
What about the input stage?
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Yes, it's not very difficult.
Perhaps we should call it a Susytron.
"No more training do you require. Already know you that which you need."
―Yoda
Well, it's not like I don't have one...
It also simulates very well without any feedback. (This is with IRFP240s rather than the Semisouth devices we all know you are likely using.)
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Recently, a member of an another forum (froggy) ebayed some mosfets (IRf 240 and 9240) in order to build an UGS UP (Cheff de Gaar).
According to the seller they were matched Vth and Ids at this point (around 1 - 2mA for the most), with a so called Fet analyzer ...
Anyway, surprisingly it appeared that the fets offer not a bad match also at 100mA bias (measured in situ) .
Is it just chance? or is there a correlation between those Vth numbers and matching at any bias current ...
Manu
According to the seller they were matched Vth and Ids at this point (around 1 - 2mA for the most), with a so called Fet analyzer ...
Anyway, surprisingly it appeared that the fets offer not a bad match also at 100mA bias (measured in situ) .
Is it just chance? or is there a correlation between those Vth numbers and matching at any bias current ...
Manu