ZM's 2SK2087C musings, phase two - SissySIT (42) as a cradle

[Zen Mod]

Sissy is for Weaklingsessss

 

[twitchie]

R112 (1K3) and P103 (500R) ... can I change to 681R for R112 and 1K for P103 instead? Don't have 1.3K in drawer and no plan to restock from Digikey or Mouser before 2023 ...

As a benefit, maybe I can leave P103 at midpoint for total resistance of 1K28 on startup ... laziness paying back with even more laziness 😼


Forgot to ask - any value changes to use Semisouth SJDP instead of Tokin elevator shaker?

Cheers,
Stephen

 

[Zen Mod]

1K3 was adamn typo, even if there is value so I left it
1K2 is perfect

yes, you can use that combo

didn't yet got to test with SJDP (Dennis sent me a pair) but I'm expecting halving level shifter resistor value should be enough

 

[twitchie]

Just in time for the holidays. Will remake one of my SissySIT R1 into SissySIT-42 SJDP if time permits. Thank you MZM!

Cheers!
Stephen

 

[twitchie]

60R4 level shift installed

 

[flocchini]

Stephen

Are you changing the SissySIT 42 shown above to the SJDP 42?

Thanks Bob

 

[twitchie]

It's a new board and instead of any Tokin SIT will go the SJDP instead. I am planning to rebuild my first SissySIT R1 with these in place of the less well behaved setup.

 

[flocchini]

This will be interesting. My SissySIT R1 moved to the back row once the Sissy42 entered the house. I think Dennis also has version 1 Sissy

 

[Zen Mod]

60R4 level shift installed

if you test those SJDP with 1A8@24Vdc and write what's Ugs, I can tell ya level shifting resistor with few ohms margin

 

[Russellc]

This will be interesting. My SissySIT R1 moved to the back row once the Sissy42 entered the house. I think Dennis also has version 1 Sissy

Where do I read about Sissy 42?

Russellc

 

[Zen Mod]

you can start from post #1 of this very thread

or you can read backwards

I always wanted to learn that skill ........

 

[Russellc]

I began, but it seemed to talk about using Sissy 42 as a"cradel" so I figured it was elsewhere. for backwards, use mirror.
Back to reading forward.

Russellc

 

[Russellc]

I keep seeing photos with discussion of Sissy 42, showing Semisouth parts, that is what got my attention, (post #84.) How are they figuring into Sissy42?
Or just teaser pic for greedy ones?

Russellc

 

[Russellc]

Oh well, not my Semisouth, still digging through stash but am only coming up with E120R125 parts. Thought I had something SemiSouth with "SJDP" maybe not.

Russellc

 

[Zen Mod]

Oh well, not my Semisouth, still digging through stash but am only coming up with E120R125 parts. Thought I had something SemiSouth with "SJDP" maybe not.

Russellc

SJEP can be used as upper OS part in SissySIT R.3 and (42), with few specific tricks:

DN2530 or DN2540 (TO220 case, lazy to check proper suffix) for M101 level shifting mosfet

level shifting resistor R133 in range of 120 to 150R

results ....... dunno, didn't tried and will I ......... maybe if I feel for it when going to try SJDP I got from Dennis

parts designation per schm in post #1 here

 

[codyt]

Ooohhh, that’s an interesting idea! Might try an SJEP in top of Sissy42.

 

[Zen Mod]

Every ZM's amp is Xmass

(Tree)

 

[twitchie]

SonySIT ... 😏
😉

 

[codyt]

How about SJEP up and 2SJ28 down?? SemiSonySIT or SouthSonySissy?

Now that’s a serious Vgs spread…

 

[Zen Mod]

even if tempting (as for mental puzzle), final results would be nothing to write home about

of total awkward things, you don't need anything more than Old Soul already is

or even Il Penitente