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kasey197 24th March 2013 11:13 AM

BD140 I/o 9610 in Aleph type front end?
I compared the BD140 vs the 9610 on a curve tracer and noted the dramatically higher transconductance on the BJT compared to the MOSFET. I don't have much experience with BJTs but they look like a nice upgrade to the 9610s on this front - before I go about making a complete *** of myself - can I just sub them into a aleph type diff pair front end ? Am I missing something obvious ?

Zen Mod 24th March 2013 11:23 AM

just try

be sure to have enough emiter degeneration - you really don't need all that OLG

kasey197 24th March 2013 03:49 PM

You mean just slot them in ?

Zen Mod 24th March 2013 04:11 PM


say 22R for Re are good for start

though , I'll toss at least 100mA through LTP , these days , whatever is choice of biguns for it

decreasing Rd(Rc) accordingly

kasey197 24th March 2013 04:38 PM

Oooo 100ma thru an input LTP ? That at least 5 times more than has ever been done afaik but maybe you're onto something there zm ....

Zen Mod 24th March 2013 04:47 PM

I'm always onto something


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