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Old 5th March 2006, 10:30 PM   #1
Zen Mod is offline Zen Mod  Serbia
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Default Babbelfish J PCBs

if you want DC gekoppelt feedback network-use C2
if not-use jumper
R6-preliminary value (shoot for 10mA through LTP)
best way is to preset 10mA during PCB assembling-without JFETS in PCB ,or just dial WR1 to have ~ 60 to 70 OHMS in WR1+R6; fine tune to 10mA after

WR2 is for fine tuning of Iq (2A)

C1 (as Papa sez) probably isn't needed at all....CRO will tell...

R14 (AC current gain ) as you wish........1K or more ,or even switch if you don't need Aleph CCS

R18- (current protection) -still didn't bother with calculating value.....with my spks-maybe I'll omit that resistor ....I'll calc value in few days-when Oly make few PCBs ,and when I start to make final version....and when I return from short trip .......

everything other-same as every other bastardized Aleph......WR1 is,besides setting 10mA through LTP,also for setting DC null on output,,,so-preset at 10mA,after full warm-up,just shoot for 0 mV on output

in my experience with Babbelfish J veeeeeery 3-dimensional prototype,messing with WR2 have some influence on offset,but-as always with Pass's bastardzzzz-we are used to some tweaking....hehe


cheers for now



do not forget---THIS IS ANOTHER ONE PAPA's JEWELL (not shoutin'-just lazy to use "underline" button)
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Old 5th March 2006, 10:31 PM   #2
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something more
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Old 5th March 2006, 10:33 PM   #3
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'nuff for now
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Old 5th March 2006, 10:38 PM   #4
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one little addendum-as I already said in partly hi-jacked thread (shame on me) (Pass Jfet amp ,or something) -I also tried this as Mini Aleph J-with 2x15V and Iq 1A-perfect solution for even wimpier Jfets on input...and IRF540 on output..........and your mama's heatsinks she uses every day for Market.....
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Old 6th March 2006, 05:32 AM   #5
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Aha . . .
You are going to make raw fish on a cold plate . . .
Seems that you like Japanese green wasabi very much . . .
You know . . . it s spicy . . .


jh
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Old 6th March 2006, 05:45 AM   #6
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This babbelfish seems to have nothing related to the Pass Jfet but to the Aleph more maybe to the J Aleph, guess itís a good approximation, like it very much Choky, excellent work youíve made along with your friend Oli to say the least.

Whatís the horsepower on this one?
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Old 6th March 2006, 02:57 PM   #7
steenoe is offline steenoe  Denmark
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Beautiful board layout. That is a masterpiece, Choky. Give your friend Oly, my compliments. Very, very nice layout
Yep, this amp is a jewell I think, in fact I think its the crown jewel sparkling over the whole Aleph range of amp's
Are you aware that its a bit dangerous to give me a nice PDF like that

Steen
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Old 6th March 2006, 06:21 PM   #8
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Quote:
Originally posted by apassgear
This babbelfish seems to have nothing related to the Pass Jfet but to the Aleph more maybe to the J Aleph, guess itís a good approximation, like it very much Choky, excellent work youíve made along with your friend Oli to say the least.

Whatís the horsepower on this one?
ya nutz?

this is my babbelfishing around Papa's Aleph J.....not any wimpy other Jfet amp......

horsepower look in Papa's pdf...............


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Old 6th March 2006, 06:27 PM   #9
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Quote:
Originally posted by steenoe
Beautiful board layout. That is a masterpiece, Choky. Give your friend Oly, my compliments. Very, very nice layout
Yep, this amp is a jewell I think, in fact I think its the crown jewel sparkling over the whole Aleph range of amp's
Are you aware that its a bit dangerous to give me a nice PDF like that

Steen

I told ya that Oly is a king with Protel

btw,there is one slight mistake with elco in minus rail....on schm
it's OK on PCB

just make it and enjoy..............

as always,Choky is worst begger here

-typing from sister's PC from Zagreb....without spell-checker etc...will be back in few days-so steen you have enough time to make pcbs for ya,even before me....like always you do.....
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Old 6th March 2006, 06:41 PM   #10
steenoe is offline steenoe  Denmark
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Quote:
Choky is worst begger here
I dont see that? You snatch a piece of knowledge now and then with your own way of asking and give us in return this piece of work Thats just magnificent, Choky. You are the big spender here

Steen

BTW. I am laying the last hand on my house refurbishing at this point! (I want it to be perfect, to keep the Miss'es pleased ) When that is done, I wouldnt be surprised to see a Babbelfish singing around here, shortly, in stereo ofcourse
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