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Old 30th December 2012, 11:02 PM   #1931
a.wayne is offline a.wayne  United States
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Are we there yet .....?
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Old 31st December 2012, 12:53 AM   #1932
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Are there any of the UKtoecutter F5T v2.0 pcb's still available ? If so how and where does one purchase a set ? They are great looking and the layout is very nice ! The ones in question are shown in post 1911 on page 192 of this thread. Thanks ...

Last edited by thor61; 31st December 2012 at 01:10 AM.
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Old 31st December 2012, 10:16 PM   #1933
Renron is offline Renron  United States
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Quote:
Originally Posted by dazed2 View Post
Thanks!
I saw that cascode equation.
Dazed2,
Could you point me to that equation please, I've looked back a few pages and I remember reading it a while ago. But for the life of me I cannot find it now.
Thanks,
Ron
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Old 31st December 2012, 10:32 PM   #1934
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A simple view of the cascode is this. R25/27 and R26/28 form voltage dividers. There values form a voltage as result of the small current that passes through them . It is this current which forward biases the diode junction of the bjt and kicks it into action. The same voltage seen by the base appears on the emitter of the bjt, minus the diode drop of about .66V. It acts to protect the jfet, eating up some of the rail voltage. It simply passes the signal, it receives from the Jfet on, eating Mr Miller's lunch at the same time, improving badwidth at higher frequencies. It adds a little voltage gain as well, but I am a little fuzzy on that among other things.....maybe all things.

Happy New Year.
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Last edited by buzzforb; 31st December 2012 at 10:37 PM.
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Old 31st December 2012, 10:40 PM   #1935
Rush is offline Rush  United States
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Quote:
Originally Posted by thor61 View Post
Are there any of the UKtoecutter F5T v2.0 pcb's still available ? If so how and where does one purchase a set ? They are great looking and the layout is very nice ! The ones in question are shown in post 1911 on page 192 of this thread. Thanks ...
You should contact Nelson Brook or Variac for those boards. I didn't know anyone had boards yet.

Rush
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Old 31st December 2012, 11:58 PM   #1936
nrg2009 is offline nrg2009  United States
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We have nice chassis` in the diy store. Like a good wine we have to wait for all parts to come together.
I am hoping to build a F5Tv2 dual channel in one 5U enclosure.
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Old 1st January 2013, 12:54 AM   #1937
Renron is offline Renron  United States
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Quote:
Originally Posted by buzzforb View Post
A simple view of the cascode is this. R25/27 and R26/28 form voltage dividers. There values form a voltage as result of the small current that passes through them . It is this current which forward biases the diode junction of the bjt and kicks it into action. The same voltage seen by the base appears on the emitter of the bjt, minus the diode drop of about .66V. It acts to protect the jfet, eating up some of the rail voltage. It simply passes the signal, it receives from the Jfet on, eating Mr Miller's lunch at the same time, improving badwidth at higher frequencies. It adds a little voltage gain as well, but I am a little fuzzy on that among other things.....maybe all things.

Happy New Year.
Thanks Buzz,
Appropriate name on New Years Eve!
Explained very well and so easy even a "Caveman" could understand it.
Like me.
Eating Mr. Miller's Lunch..........LOL
Ron
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Old 1st January 2013, 02:08 AM   #1938
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renron. if you download the BOM i sent on the last page or somthing, then you will find the cascode formula on page2
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Old 1st January 2013, 02:10 AM   #1939
Variac is offline Variac  United States
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Quote:
Originally Posted by Rush View Post
You should contact Nelson Brook or Variac for those boards. I didn't know anyone had boards yet.

Rush
We've gotten the boards made, now certain members who've been willing to take the risk are building them up to make sure they work.

When we know they are good, we'll put them in the diyAudio Store and announce it everywhere!

Mark
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Old 1st January 2013, 02:12 AM   #1940
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variac. have you sent the info i needed?
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