[sdiy] jfet driver
list at mikebeauchamp.com
Wed Feb 27 01:19:50 CET 2019
> The question is, HOW LOW? That depends on the JFET. Some, like the 2N4391,
> are fairly unforgiving and will only reliably shut off when the Gate is held
> at about -10V or less. It is best to take these right to the negative rail.
> Others, like the 2N5485 (which I see is now "obsolete" on Digikey -- too
> bad, it's a useful one) are more forgiving, and will "usually" shut off at a
> Gate voltage of about -4V.
Is the -10V shut off voltage for the 2N4391 the same as the "Voltage -
Cutoff (VGS off) @ Id" characteristic?
If so I'm seeing N-Channel FETs on Digikey with a VGS(off) anywhere
between 180mV and 10V.
Something like J106FS-ND has a VGS(off) of -2V typical and is through-hole.
More information about the Synth-diy