F5 power amplifier

[jackinnj]

To correct the record, I've experimented with Lateral MOSFETs in the F5 but wasn't satisfied with the results. I use Fairchild devices.

[gaborbela]

I'm really sorry Juma if you feel that way .I do not want to hurt your feelings !
Please forge me . If you read my post you can realize my English not the best . I know that is my fault .
I didn't slept the last 24 hours , probably is not the best time to post at on the forum now .
How I said I have a lot to thank to you .
One more time honestly please forgive me .
Now with your last post made it clear !
I do not want to lose your help in any cost ! You and Thanh you guys helped me a lot .
Thank You ! and Thank you !
Now all clear BJT for cascode and I stick with the orig JETs as driver .
Greets
I hope you can forgive me !
If it was not that V FET or JET I 'm sure these misunderstanding from my part it could be avoided .

[Zen Mod]

Originally Posted by juma

Are you dyslexic ? .....

I am .

so what ?

calm down , ya kwayzee Serb .........

[jackinnj]

Originally Posted by juma

Are you dyslexic ? What is JET ?

"A JET is a JET to his last dying day" -- or so said Leonard Bernstein.

[generg]

Hi gaborbela,

what do you think of this?

UGS Power : it's U.P.

[brianco]

Originally Posted by gaborbela

.......

I hope you can forgive me !

.............

.

@gaborbela

What is clear is that English is not your first language. That along with a lot of enthusiasm can lead to all sorts of misunderstandings. You have apologized - more than necessary - so just let it rest!

@Everyone.

I do think that some of the posts which have recently appeared on this thread are outside the normally very friendly and helpful posts usually found on the Pass Pages! Remember NP's sign off----

[IF anyone wants to be terse and or generally difficult a couple of other threads I can think of will accommodate that desire!]

Thanks

[juma]

Originally Posted by Zen Mod

I am .
so what ?

So you can't drive your jet

[tinitus]

Originally Posted by jackinnj

To correct the record, I've experimented with Lateral MOSFETs in the F5 but wasn't satisfied with the results. I use Fairchild devices.

Too late

It may help me to know just a little about what you tried that didnt work
Number of outputs, rail voltage, value of gate resistors, source resistors
Anythig you can remember
I dont expect much, just smaller things please, and thats the end of it

[Melon Head]

Originally Posted by jackinnj

"A JET is a JET to his last dying day" -- or so said Leonard Bernstein.

I love it

Hey Gab

Just one more time. It is JFet not Jet ok.

And Juma was suggesting V grade JFets. The Jfets are graded in to Idss classifications ie gr, bl, and v grade.
If you look at the your Jfets closely you should see one of those classifications stamped on the device. V grade devices have the highest Idss value.
I used bl grade but I measured them to choose a nice matched pair suitable for the task. From memory Idss was around 10mA for my JFets.

The resistor values are not absolutely critical for cascoding, however since Juma has already told you what to use, it would be a bit rude not to take his advice.

The improved simulated performance was from using the higher voltage rails (eg +/-40V) and not from cascoding.
Cascodig was used to protect the Jfets from such high voltage (and increased power dissipation)

Best Wishes, Don't give up just yet

[Melon Head]

Originally Posted by generg

Hi gaborbela,

what do you think of this?

UGS Power : it's U.P.

Souce follower at output. Is that an F4X?