About possible Babelfish J interest

[Zen Mod]

well ...... for J-Babelfishing Aleph 2 , we don't need brain , Papa already did everything ...... and all we need is just to take what's important from recipe :

- rails
-number of outputs
-Iq
-important value of Aleph CCS gain

so everything refers to this :

(now I'm going to kill some pancakes and to play with calculator and Eagle schm editor ; will post results when done)

 

[Zen Mod]

BABELFISH J AS ALEPH 2

here it is , finally ;

look at attached schm , I believe I edited everything ;

note - input JFets doubled , doubled current through them (LTP) , BD140 cascodes instead of eeenyweeeny BC critters

few resistors marked as 1W - you can easily buy metal oxide ones , tiny as regular 600mW metal-films ; up them smidge above pcb

for more necessary info about general approach (how to connect Daughter boards , recipe for eternal life and no need for Viagra ....) read these posts:

#21 (important Snake Oil notes)

#80 (how to actually do it ; imagine 2 daughter boards per side , paralleled)


Greedy Boy Coasttocoast asked for something with 38Vac rails ........ that would be aroundish 47-48Vdc

same applicable

Boyz - you're nutz ........ who need that sort of power ?

 

[Coasttocoast]

Greedy Boy Coasttocoast asked for something with 38Vac rails ........ that would be aroundish 47-48Vdc

Boyz - you're nutz ........ who need that sort of power ?

It’s in my nature. Just finishing up a year long project modifying my 1969 MB230 to install a 500 HP Chevy LS engine. New firewall, new transmission tunnel, rack and pinion steering, shaved everything under the hood and painted. All my work.





Need HiFi project while MB out for paint.

 

[Zen Mod]

completely rational
no need for anything less than ...... overkill

 

[WalterW]

It’s in my nature. Just finishing up a year long project modifying my 1969 MB230 to install a 500 HP Chevy LS engine. New firewall, new transmission tunnel, rack and pinion steering, shaved everything under the hood and painted. All my work.

View attachment 644047

View attachment 644048

Need HiFi project while MB out for paint.

You are really a multi-talented human being with 30 hours in every day

 

[Ultima Thule]

here it is , finally ;
look at attached schm

I looked at the schematic, it also have those "mysterious" P-devices in the IPS, can someone clarify why we would like to choose a P-ch IPS instead of N-ch?

 

[Zen Mod]

J271 or 2SJ74BL

entire construction is ........ Papa's ;

ask him why he chose this polarity instead of other one

 

[carsten.witt]

Hi ZM,

in preparation ... I read the whole thread and copy me some parts from here in a doc for my build but now I have some questions ..

So, i didn't understand what the LEDs do, you wrote here (have read the Aleph CCs mod PDF but my English is not so good ...) :-(
"LED string thingy is fed with anything between 3-5mA ; it can be resistor or MMBF JFet , but I like 3mm greenies combined with JFet CCS sponginess "
=>found which one from Kingbright with 2.8V/20mA and 2.2V/2mA which should it be or misunderstood something?

And for Q4 (BD140-16) found I two different types: hfe 100 or 40@150mA/2V
=> which would be fit best?

Thanks for your hints!

Berlin is greeting ....Carsten

 

[Zen Mod]

there is small constant current source made of MMBF JFet , pushing current through LEDs+1N4148 string ; theyre having pretty nice and constant voltage drop , used here to form voltage level/reference for cascodes ;
I like common/peasant/bauer diodes , green , 3mm ones ; they're having nice drop of 1V93 ..... with currents from 2 to 5mA

regarding BD - whichever you find in drawer , or those easier to buy/get

 

[mpmarino]

ZMs voltage references are responsible, in that they light the room to offset the amplifier's inefficiencies.



(an hour ago I was putting together a 'zener' emitter follower, and needed a 4v reference - nothing in drawer except a couple of greenies )

 

[mpmarino]

It’s in my nature. Just finishing up a year long project .......

Sir, we have something else in common. My '90 Nissan 300zx has a 5.3 LSX.

All work by me as well. Still has the factory 5sp. No kit, just many late nights.

Nice job there! Mine is a lower budget job.

We should stay on topic. ZM would get upset

 

[Zen Mod]

....nothing in drawer except a couple of greenies )

 

[Zen Mod]

.....

We should stay on topic. ZM would get upset

 

[carsten.witt]

@ZM,
thanks for your answers.

An externally hosted image should be here but it was not working when we last tested it.

74er 2002tii 850kg >230HP

 

[Zen Mod]

.........

An externally hosted image should be here but it was not working when we last tested it.

74er 2002tii 850kg >230HP

403. That’s an error.
Your client does not have permission to get URL /axb7rlyCIZmv5jtuBUhZ0skXCT0LAhw55eSpjKnvAa0wCwvt3LWuG-5IfZSf3iR5T3lqcxRL39MSfE0=w2754-h1710 from this server.

 

[carsten.witt]

Hi,
didn't know why preview was ok.

 

[Zen Mod]

that means Fugly!!

same as in your avatar ?

 

[carsten.witt]

Jupp,

but the avatar is a multi pic ... little bigger (lost the original pic), car is a original historical racing car "Gruppe 2".

Ok,
back to topic ...C5 could be also a 6pF?

 

[Coasttocoast]

WalterW, thanks for the compliment! I would love to someday build a Sony project like yours someday if parts could be found.

Carsten.witt, awesome car!

Zen Mod, thanks for supporting our off topic interests!

I’ve spent a few hours putting an order together for “Babelfish J as Aleph2”.

I’m pretty good at hands on construction and following instructions, but understanding and picking electric components is a stretch for me.

So by scaling the pic of the board posted for measuring, research of similar BOM’s and pics posted on this thread here is what I have ordered today.

I welcome all comments to where I have gone astray.

 

[Zen Mod]

I can't see anything wrong ....