Krazy PSU for JFET cascode BOSOZ - diyAudio
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Old 1st February 2006, 03:47 AM   #1
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Smile Krazy PSU for JFET cascode BOSOZ



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
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Old 1st February 2006, 03:10 PM   #2
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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.
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Old 1st February 2006, 05:35 PM   #3
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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
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Old 2nd February 2006, 12:52 AM   #4
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Here is rev1.
Any criticism plz.

Regards
jh
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Old 2nd February 2006, 01:15 AM   #5
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increase those 0,1uF to at least 1 or,even better, 2,2uF film cap


also,you can still cascade triple like this
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Old 2nd February 2006, 01:50 AM   #6
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Thanks, Choky!

Hope that I understood the cascade triple correctly.

Regards
jh
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Old 2nd February 2006, 10:24 AM   #7
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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
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Old 2nd February 2006, 10:50 AM   #8
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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
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Old 2nd February 2006, 11:12 AM   #9
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hehe-seems that boyz from exciting hell and serbia have more time han others...
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Old 2nd February 2006, 10:41 PM   #10
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Hahaha ^^ . . . Yes . . .
while the master is too busy on the chicken table.

Regards
jh
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