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