SIT-3

[generg]

..........
Actually, the match is for Vgs, not transconductance in order to trim the
bias current. Originally I tried to get as close a Vgs as possible, in an
effort to reduce the resistive degeneration, but then I developed a
technique to retain the "square law effect" independent of that.

Thank you Mr. Pass for correcting my assumption.
Is in second order the k2/k3 relation a bit shifted?

Your treasure chest is always full ...... )

So we have some stuff to think... as always.

 

[generg]

inspired by SIT-3, but maybe idiotic.....

:--))

 

[Nelson Pass]

Could that elusive cap glued to the bottom of the board be a bypass for the IRFP240 source resistor ?

More interesting than that.

 

[Blues]

Has anyone described the SIT3 as buffered autoformer yet? I haven't gone thru all the pages...

 

[generg]

inspired by SIT-3, but maybe idiotic.....

:--))

I was told that the source follower solution sounded worse compared to the DEF.

 

[Zen Mod]

believing is good , but restless soul as you are ....... will test it , no doubt

 

[generg]

Yes, my personal trainer, I will try to be less restless....

:--))

 

[Nelson Pass]

I was told that the source follower solution sounded worse compared to the DEF.

That is not the conclusion. The Source follower SIT is pretty close to
the DEFiSIT into 8 ohms at lower power levels, but falls short in terms
of output power.

All of this is just subjective opinion anyway. I will continue to explore the
DEF with the Jfet - I have those parts and the design has since morphed.

 

[generg]

Thank you for clarification Mr. Pass.

Lower output means 10W for the Source follower SIT?

I did not quite understand your last line...

DEF with the J-Fets....do you mean the J-Fet input pair or some SS at the output?

 

[Bigun]

this is one of the best threads of late

I have some Russian SITs but unfortunately they are for high voltage so can't be used for this project - unless I add another transformer on the output - hmmmmmm

 

[Nelson Pass]

Lower output means 10W for the Source follower SIT? DEF with the J-Fets....do you mean the J-Fet input pair or some SS at the output?

Yes 10 watts.

The Jfet is SS R085 or R110 depletion mode N channel part.

 

[Soundhappy]

Now I have a good view of the photo with large screen.
Wander to know which scenario is happened first:
A) Mr Pass had bought a truck load of Antek double shielded toroids.
B) Mr Pass had bought a truck load of CineMag unshielded transformers.

Cheers

A happened first.
Plitron toroids are for " de Luxe " stuff
The Plitron Story: Parent Company of Torus Power Conditioning and Isolation Products - YouTube
Antek Inc. are very good quality and more Diyer pocket friendly
Antek Transformer First Impressions

 

[Pascal Nguyen]

A happened first.
Plitron toroids are for " de Luxe " stuff
The Plitron Story: Parent Company of Torus Power Conditioning and Isolation Products - YouTube
Antek Inc. are very good quality and more Diyer pocket friendly
Antek Transformer First Impressions

Hi soundhappy,
You mean in case Mr Pass bought shielded input transformer by the truck load, wouldn’t he going to use Antek’s.

Cheers

 

[Soundhappy]

I mean Plitron is used in Pass Labs products, very high excellent quality and expensive

 

[Bare]

Sure looks like an Antek in Post 43

 

[Zen Mod]

new page in FunnyMoon test article

 

[Nelson Pass]

I see he has learned a new word:

wakoo

 

[Zen Mod]

that one is also from ZMEngrish

 

[nicoch58]

wazoo too

 

[Zen Mod]

that's not ZMEngrish