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
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
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
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
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
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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...I have this one ...and certainly like it a lot!
That is why i am curious .
Why not go for that one and go for the BJ ? because of the outputs ?
C
matter of choice and 200+$ difference in outputs ?
however , speaking of broad interest/possibility - (B)J2 is still sorta uncovered
that's why that opportunity is one time offer
however , speaking of broad interest/possibility - (B)J2 is still sorta uncovered
that's why that opportunity is one time offer
Got my lead free (PBF) IRFP150s in route.
Is there a BOM, or marked up schematic with components that belong where?
Thanks
Is there a BOM, or marked up schematic with components that belong where?
Thanks
will be published in few days
though not brainless BOM in usual meaning , but complete schm with necessary important notes
though not brainless BOM in usual meaning , but complete schm with necessary important notes
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
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