Jfet Bosoz?

hifimaker · 8th March 2007, 06:38 PM

Has anyone experimented with creating a JFET version of the BOSOZ? Seems like an interesting idea. Just wondering if this has any merit.

-David

Nelson Pass · 8th March 2007, 06:45 PM

It has a tremendous amount of potential.

While simply hooking up a 2sk389 in that topology actually
works well, it is easy to envision a fully cascoded and
constant current sourced version, with output followers
if you want to "gild the lily"

If there is any enthusiasm, I'll go dig up some of my curves and
get back to you next week.

apassgear · 8th March 2007, 06:50 PM

Quote:

Originally posted by Nelson Pass
It has a tremendous amount of potential.

While simply hooking up a 2sk389 in that topology actually
works well, it is easy to envision a fully cascoded and
constant current sourced version, with output followers
if you want to "gild the lily"

If there is any enthusiasm, I'll go dig up some of my curves and
get back to you next week.

I for one would be very intresded in seeing such topology in action. Any posibility that you could post also a schematic? May be this is asking too much

Thanks very much Nelson

Nelson Pass · 8th March 2007, 07:31 PM

You can chew on this if you like...

Vix · 8th March 2007, 07:45 PM

Wow! Woo!

I started thinking about BOSOZ, Aleph P....and now this one!

Q3-Q6 could be replaced by mosfets CCS, or resistors...

What devices do you recommend for Q1 and Q2? Would LU1014D work in this circuit?

Thanks,

Vix

hifimaker · 8th March 2007, 07:47 PM

Quote:

Originally posted by Nelson Pass
You can chew on this if you like...

Very chewy!

-David

cviller · 8th March 2007, 07:49 PM

Nice!

Then we just need to adjust the gain to work nicely with F4...

I think NP already suggested 2sk389 (or matched 2sk170).

Zen Mod · 8th March 2007, 07:51 PM

simplified enough?
even if I delete degenerative resistors randomly

Vix · 8th March 2007, 08:12 PM

Quote:

Originally posted by Zen Mod
simplified enough?
even if I delete degenerative resistors randomly

Almost. I wanted to use resistors instead of CCS. Just keep the gain Jfets. How could we call this circuit. Bride of F4?

Zen Mod · 8th March 2007, 08:53 PM

Quote:

Originally posted by Vix

Almost. I wanted to use resistors instead of CCS. Just keep the gain Jfets. How could we call this circuit. Bride of F4?

really depends on your power needs with F4.
if you need smaller swing,then resistors are good ;
for bigger swing you need CCSes and even higher PS voltages......and then even cascoding of jfets.

B200 still?

8th March 2007, 06:38 PM	#1
hifimaker diyAudio Member Join Date: Oct 2003 Location: San Jose	Jfet Bosoz? Has anyone experimented with creating a JFET version of the BOSOZ? Seems like an interesting idea. Just wondering if this has any merit. -David

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8th March 2007, 06:45 PM	#2
Nelson Pass The one and only Join Date: Mar 2001	It has a tremendous amount of potential. While simply hooking up a 2sk389 in that topology actually works well, it is easy to envision a fully cascoded and constant current sourced version, with output followers if you want to "gild the lily" If there is any enthusiasm, I'll go dig up some of my curves and get back to you next week.

8th March 2007, 07:45 PM	#5
Vix diyAudio Member Join Date: Nov 2003 Location: Somewhere on Planet Earth	Wow! Woo! I started thinking about BOSOZ, Aleph P....and now this one! Q3-Q6 could be replaced by mosfets CCS, or resistors... What devices do you recommend for Q1 and Q2? Would LU1014D work in this circuit? Thanks, Vix

8th March 2007, 07:49 PM	#7
cviller diyAudio Member Join Date: Dec 2005 Location: Copenhagen Blog Entries: 2	Nice! Then we just need to adjust the gain to work nicely with F4... I think NP already suggested 2sk389 (or matched 2sk170).

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