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Old 22nd February 2011, 03:16 AM   #31
EUVL is offline EUVL  Europe
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I have revisited the cascode options in the last couple of days, and read some of Borbely's paper again. He has abandoned the use of bipolar cascode in favour of JFETs in all his new designs, with reasons.

So I have come up with a new JFET cascode which will give better performance than the J111/J174 and yet not more complex than the bipolar cascode. And we shall include that on the PCB layout, together with the J111/J174 option. The amplifier will then remain an all-FET design.

Again, this is only for experimentation purposes. Only actual test will decide whether it brings anything.


Patrick

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Last edited by EUVL; 22nd February 2011 at 03:21 AM.
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Old 22nd February 2011, 10:28 AM   #32
AndrewT is offline AndrewT  Scotland
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Hi,
I have just found this new thread.
Hopefully this will stop all the complainers, moaners, etc from distracting the interested from their goal.
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Last edited by AndrewT; 22nd February 2011 at 10:29 AM. Reason: allows me to search for all threads in which I have posted
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Old 22nd February 2011, 02:07 PM   #33
EUVL is offline EUVL  Europe
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Thanks for your continued support.

Patrick
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Old 22nd February 2011, 02:15 PM   #34
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Quote:
Originally Posted by EUVL View Post
I have revisited the cascode options in the last couple of days, and read some of Borbely's paper again. He has abandoned the use of bipolar cascode in favour of JFETs in all his new designs, with reasons.


Patrick

.
hi Patric
sorry to bother you - take your time to reply
what is the reason for Borbely to switch to FET cascodes?
thanks
Kannan
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Old 22nd February 2011, 02:36 PM   #35
EUVL is offline EUVL  Europe
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Ease of distortion cancellation, if I understand correctly.

Patrick
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Old 23rd February 2011, 02:12 AM   #36
qusp is offline qusp  Australia
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well i have received no reply from fitzfish on the transformer query. perhaps he will see here. perhaps i am not worthy? anyone else in the build team i can contact who might know?

perhaps the switch to fets also was congruent with his advertising byline creating 'all fet' designs hehe
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Old 23rd February 2011, 02:27 AM   #37
pchw is offline pchw  United States
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Here is what the invoice said:
RC0600 915 5 banded transformer
My invoice number is 5149.

Hope this will help.
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Old 23rd February 2011, 03:12 AM   #38
qusp is offline qusp  Australia
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thats perfect thanks!!
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Old 23rd February 2011, 06:36 AM   #39
qusp is offline qusp  Australia
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it has come to my attention that my post above if taken seriously could be taken the wrong way. my post

Quote:
well i have received no reply from fitzfish on the transformer query. perhaps he will see here. perhaps i am not worthy?
was more me thumbing my nose at the sometimes deserving attitude that seems to be going around lately. it was not meant to be taken seriously thus the smiley, as i know others like myself have their own lives they must get on with. so Dave if you read it like this my apologies, i was not being serious, but i guess its still a bit raw for some people at the moment.

all sorted thanks to pchw anyway, so as you were
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Old 23rd February 2011, 06:20 PM   #40
EUVL is offline EUVL  Europe
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I can give you a small piece of good news.

We have been in touch with the forum and are discussing details of the PCB prototyping run.
So we are back on schedule.




Patrick
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