higher Idss is OK , just keep an eye od dissipation (say no more than 150mW per JFet, more is making me nervous...if needed ,just increase resistance of source trimpot,, meaning - use first bigger value )
pot value - that's relevant to sources you have in front of pot - more cojones,lower pot value
so ,10Klog to 100K log
pot value - that's relevant to sources you have in front of pot - more cojones,lower pot value
so ,10Klog to 100K log
Some progress has been made with most of the parts stuffed.
I've also found and picked out jfets for the buffer. For the transformer,
I'll likely use Cinemag (low nickel).
For the 14 pin header, is there a recommended part? The pitch seems
to be 2.5mm or 2.54mm. Would something like these be suitable?
DF1BZ-14DP-2.5DSA Hirose Connector | Mouser Canada
DF1B-14DS-2.5RC Hirose Connector | Mouser Canada
Thanks,
Dennis
I've also found and picked out jfets for the buffer. For the transformer,
I'll likely use Cinemag (low nickel).
For the 14 pin header, is there a recommended part? The pitch seems
to be 2.5mm or 2.54mm. Would something like these be suitable?
DF1BZ-14DP-2.5DSA Hirose Connector | Mouser Canada
DF1B-14DS-2.5RC Hirose Connector | Mouser Canada
Thanks,
Dennis
Attachments
oh , btw.......
there is ongoing e-mail correspondence between Flying Jim (6L6) and Patrick A. (sorry, ZM didn't catch Patrick's Nick) and Mighty ZM ..... you can easily grasp how easily ZM is confused with e-mails flying between 3 of us .......
anyway , topic is final development of Iron Pre preamps ( both SE and non-SE) , mostly related to brushing up nomenclature , enabling all bells and whistles,helping with BOMs and preparing of Build Guide , enclosure(s) etc.
my part is finished (sch and pcbs) , so I'll post just teasers -- how final pcbs are going to look
hope I'm not stepping here on their toes ......
edit: Diyaudio gave me so much during all these years , this is just a smidgen , me trying to give something back
there is ongoing e-mail correspondence between Flying Jim (6L6) and Patrick A. (sorry, ZM didn't catch Patrick's Nick) and Mighty ZM ..... you can easily grasp how easily ZM is confused with e-mails flying between 3 of us .......
anyway , topic is final development of Iron Pre preamps ( both SE and non-SE) , mostly related to brushing up nomenclature , enabling all bells and whistles,helping with BOMs and preparing of Build Guide , enclosure(s) etc.
my part is finished (sch and pcbs) , so I'll post just teasers -- how final pcbs are going to look
hope I'm not stepping here on their toes ......
edit: Diyaudio gave me so much during all these years , this is just a smidgen , me trying to give something back
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well, ''Pre'' in title is somewhat hinting that .......
but , anyway , that's line preamp stage , where you have selector (5inputs) followed with resistive attenuator (volumepot) , then followed by buffer (with reg. psu ) and finally autoformer at output ..... everything on board ;
SE iteration - both channels on one pcb , 3 different brands of autoformers applicable, settable gain 6db or 12db
Bal iteration - one channel- one pcb , 3 different brands of autoformers applicable, gain fixed 6db , arbitrary number of (fixed) SE inputs , rest to 5- Bal inputs, both SE and Bal outputs (active in same time) ; so , functioning as SE in/Bal out and Bal in /SE out converter , and normally as Bal in/Bal out stage
if I forgot something ........ just shoot
but , anyway , that's line preamp stage , where you have selector (5inputs) followed with resistive attenuator (volumepot) , then followed by buffer (with reg. psu ) and finally autoformer at output ..... everything on board ;
SE iteration - both channels on one pcb , 3 different brands of autoformers applicable, settable gain 6db or 12db
Bal iteration - one channel- one pcb , 3 different brands of autoformers applicable, gain fixed 6db , arbitrary number of (fixed) SE inputs , rest to 5- Bal inputs, both SE and Bal outputs (active in same time) ; so , functioning as SE in/Bal out and Bal in /SE out converter , and normally as Bal in/Bal out stage
if I forgot something ........ just shoot
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