Krazy PSU for JFET cascode BOSOZ

[jh6you]

Hi, Choky and Pass Labs forum members!

I move this subject here from My Take on Threshold NS10

Choky, I am an owner of two BOSOZs.
For the first one, I have a plan to try your CCSed zener regulator.
And, for the second one, I like to try this too.
I put all resistor values using your calculation method.

Ref. A point is about 60V for the top rail.
Ref.B point is about 18V for the upper CG MOSFET of the the cascode.
Ref.C point is about 9V for the bottom CCS.

Give me more comments plz.

Regards
jh

 

[Zen Mod]

make triple (cascaded) like this,off course with adequate resistors and number of zenners for each voltage;just because CCS for zenner string is important;if you are pedant,and you are you can put one 1N400x in series with each zenner string,with cathode to ground-just to more stabilize temp variation in each string; and also-put no more than 10uF across each zenner string,preferably non elco
btw-you don't need 40mA through that TIP-20mA is OK.

 

[jh6you]

Are you sure? You are a toobooh guy . . . ?
Is that all . . . ?

Do you mean three pairs?
Understood about the compensating diode . . .
Also undestood about the 10uF . . . 0.1uF film okay?

I need to go to bed . . . it's 3:30am . . . ha~~~~ ~ mh . . .

Regards
jh

 

[jh6you]

Here is rev1.
Any criticism plz.

Regards
jh

 

[Zen Mod]

increase those 0,1uF to at least 1 or,even better, 2,2uF film cap


also,you can still cascade triple like this

 

[jh6you]

Thanks, Choky!

Hope that I understood the cascade triple correctly.

Regards
jh

 

[Zen Mod]

fine with me
you still can use PNP BJTs and rellocate zenners to collector leg ,and change role of BJTs from em. follower to CCS

 

[jh6you]

Thanks, Choky.
Do not worry . . . I will try PNP version too . . .

By the way, where are all other diYers . . . ?
Why are they so quiet . . . ?

Best Regards
jh

 

[Zen Mod]

hehe-seems that boyz from exciting hell and serbia have more time han others...

 

[jh6you]

Hahaha ^^ . . . Yes . . .
while the master is too busy on the chicken table.

Regards
jh

 

[jh6you]

This is my fanal shot of NPN version in addition to Choky's PNP one . . .

Choky, again many thanks.
Hmm . . . what should I do for you . . .
Do you need some of J310 JFET?

Regards
jh

 

[Zen Mod]

This is my fanal shot of NPN version in addition to Choky's PNP one . . .

Choky, again many thanks.
Hmm . . . what should I do for you . . .
Do you need some of J310 JFET?

Regards
jh

haha....judging by addition of 4v3 zenners,you tried it in vivo?

tnx for offer, but I didn't do anything speciall to you
just drink one real bear (sake,vine,whatever) with me (virtually or not)

 

[jh6you]

Okay . . . Cheers!!!


What is the "vivo" . . . ?
Last night having time with a bottle of red wine, I tried to connenct this with a pencil to the other part of Krazy . . . hhhmmm . . . I need another mod . . . You know why.

Regards
jh

 

[Zen Mod]

Okay . . . Cheers!!!


What is the "vivo" . . . ?
Last night having time with a bottle of red wine, I tried to connenct this with a pencil to the other part of Krazy . . . hhhmmm . . . I need another mod . . . You know why.

Regards
jh

in vivo----- in a flesh

 

[jh6you]

PCB . . . How it looks like . . . ?
This time, too . . . I have to go this way.

Regards
jh

 

[Zen Mod]

I like it
sort a backwards,comparing to schm
real pcb

 

[jh6you]

Hi Choky

You highly recommend to make a CCS drive zeners.
What about this . . . ?

Regards
jh

 

[Zen Mod]

just be sure that your CCS j-fet can withstand D-S voltage difference

 

[jh6you]

Source resistor . . .
Too low current . . . ? Parallel . . .

Regards
jh

 

[Zen Mod]

Source resistor . . .
Too low current . . . ? Parallel . . .

Regards
jh

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