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Old 13th June 2007, 08:11 AM   #181
Zen Mod is offline Zen Mod  Serbia
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Quote:
Originally posted by steenoe
You are right about the supply. Just made a quick drawing of the shunt reg and it ended up with more parts than the gainstage So battery power is the simple solution.
2 normal 9V batteries should do the trick for starters.
I also think that its a very good idea to do as cviller suggests and go back to the original circuit and take it from there

Steen

as I said ...never mind.....- as Papa sez ........

CRO and sig gene will take you "there"

without exact load lines , and for actual jfets they are even more sheeshee than for toobz , you can't do nothing more than draw prototype ; after that ear and little gadgets can tell more .
remember your last proto jfet xccs@#$%**%$ BOSOZ - we started with 9mA per jfet ; you must decrease current.....and now is time to replace IRFs with little bjts ,because IRFs are starving with so weeny current ........
and what- we are again in teritory of half UGS......


so- Pumpkin,what else......

ZM- proud inventor of The Boiled Water
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Old 13th June 2007, 08:21 AM   #182
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Quote:
Originally posted by Vix


Babowana, I wish you good luck, wherever you're going. By the way, is it going to be a bit difficult to move those big speakers? (it was J-low, right?)

Vix

Thanks, Vix.
Yes, J-Low. Very big, heavy and simple. Really Papa style ^^~.
I will tell the custom officer that it's Papa's gift ^^. Thanks, Papa ^^~


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Old 13th June 2007, 08:27 AM   #183
steenoe is offline steenoe  Denmark
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Quote:
Originally posted by Zen Mod



as I said ...never mind.....- as Papa sez ........

CRO and sig gene will take you "there"

without exact load lines , and for actual jfets they are even more sheeshee than for toobz , you can't do nothing more than draw prototype ; after that ear and little gadgets can tell more .
remember your last proto jfet xccs@#$%**%$ BOSOZ - we started with 9mA per jfet ; you must decrease current.....and now is time to replace IRFs with little bjts ,because IRFs are starving with so weeny current ........
and what- we are again in teritory of half UGS......


so- Pumpkin,what else......


ZM- proud inventor of The Boiled Water
Excactly. Why use a power-mosfet for 8mA current? I am sure its better to use smaller devices for biasing/cascoding in the Xccs...and so on... BosoZ. My bet is that "The Pumpkin" will sound great
The J-fet BoZ is a nice little toy. I will try and play around with it for fun Might turn out to be a handy little gadget without the powercord. Looking for a lunchbox right now

Steen
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Old 13th June 2007, 08:35 AM   #184
Vix is offline Vix  Yugoslavia
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Quote:
Originally posted by steenoe
Looking for a lunchbox right now

Steen

Even a "STR8" box will work.

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Old 13th June 2007, 09:37 AM   #185
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!!! OFFTOPIC !!!


Steen,

Here is Kubota Takashi preamp which I used time ago for my 0dB
power amp (Hitach MOSFETs). You could make PCB if you like ^^.





!!! OFFTOPIC !!!
Attached Images
File Type: jpg kubota takashi.jpg (60.0 KB, 2320 views)
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Old 13th June 2007, 09:41 AM   #186
steenoe is offline steenoe  Denmark
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Quote:
Originally posted by Vix



Even a "STR8" box will work.

As long as the lid comes off in a snap, for changing the batteries

What is the best way to optimize the loadline without a Distortion Analyzer? I was thinking of installing trimpots like Vix suggested and tweak the values to get the nicest sinus-curves at 1V , 1KHz while watching the screen. Repeating at 10kHz and 20kHz.
Any other suggestions to get the best values Vds/Ids for lowest distortion?

Steen

Edit. Thanks a lot JH. Thats a nice schematic, with lots of
J-fets
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Old 13th June 2007, 09:44 AM   #187
Zen Mod is offline Zen Mod  Serbia
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Quote:
Originally posted by Babowana
!!! OFFTOPIC !!!


Steen,

Here is Kubota Takashi preamp which I used time ago for my 0dB
power amp (Hitach MOSFETs). You could make PCB if you like ^^.





!!! OFFTOPIC !!!

you'll be banned for good if you continue like this;
you KNOW that off topic posts are strictly allowed in threads
started by :
Lucky Luke,Baobabwana,jaccoshmacko,Choky.......mebbe even MetalMasterMag ........

btw- nice one ,even if teuer (but- there is really no point in making any circ non-susy ,if it have more than one transistor )

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Old 13th June 2007, 09:46 AM   #188
Magura is offline Magura  Denmark
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Quote:
Originally posted by steenoe


Any other suggestions to get the best values Vds/Ids for lowest distortion?

Steen


Or drop by sometime and borrow my distortion analyzer


Magura
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Old 13th June 2007, 09:48 AM   #189
Zen Mod is offline Zen Mod  Serbia
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Quote:
Originally posted by Magura



Or drop by sometime and borrow my distortion analyzer


Magura

may I too ,Sir?

please.........


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Old 13th June 2007, 09:54 AM   #190
steenoe is offline steenoe  Denmark
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Quote:
Originally posted by Magura



Or drop by sometime and borrow my distortion analyzer


Magura
Thanks I better do that. How are your amps comming along? Would be nice to hear them too
You better invite Zen Mod too, I am sure he will volunteer being the Grillmeister

Steen
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