About possible Babelfish J interest

Official Court Jester
Joined 2003
Paid Member
Well , after some time , I'm able and willing again to bring some Babelfish J packages ; Sort of altered schematic , including cascodes (easily avoidable by choice) for input LTP , biased through my green (LED string ) trademark thingie .

Package would be comprised of :

-pcbs (one layer , usual thickness/color/overlay mumbo jumbo)) , 2 pcs,
-2 pairs of matched J271 JFets - in this project perfect
substitute/replacement for Toshiba 2SJ74BL ,
-2 pairs of BC556C bjt LTP cascode critters,
-3+3 more BC critters for various position
-2pcs of MMBF5486 smd JFets , working as CCS for cascode biasing,pre-soldered on pcbs,
-2 pcs of 1uF Philips MKC (polycarbonate, my fave ) , bypass for critical position - cap for Aleph CCS modulation .

so , end of list; few more details :

Output mosfets prescribed - IRFP150 (one effectively as two IRFP240), just one pair , no matching needed .
Soldering of outputs - either through hole or on wire bridges on upper pcb surface .

Due to cascoding , PSU voltage can be freely augmented for several volts. Also possible multiplying of outputs with some necessary ingenuity , but if there is enough noise , I can make daughter boards for paralleling of , say , 3 mosfets , when there is no need for additional ingenuity :rofl:

That would be all , if there is enough interest , I'll proceed in Swap Forum .

Price - not cheap , but also not overly expensive , considering that rest what you need is available even in nearest Tobacco store .

Screenshot of pcb attached .

and , yes , I know that BJ isn't exactly in VFet/SIT/SIC frenzy fashion category :clown:

edit: forgot schm

edit edit : in a meantime , trade thread opened: Babelfish J package - diyAudio

editeditedit : link to final schematic and parts placement ........ in case that link is Dodo , post is #138
 

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Official Court Jester
Joined 2003
Paid Member
cascoded input , so no fear for input JFets

like this with no change in values , up to 30-sh V/rail

more ...... there is sense in it only if multiplying outputs in same time , to keep both voltage and current capability in same ratio

working on best logic/implementation of daughter boards for multiple outputs