[sdiy] No1: JFET for Vdivider apps?

[David G Dixon]

The key is that you don't want the negative lobe of your signal to push the
JFET open inadvertently when your trying to hold the JFET closed by applying
the negative rail at the gate.  This means that you don't want a very large
pinchoff voltage.

I've had good luck with 2N5485 (through hole) and MMBF5485 (surface mount)
for things like switching -1/+1 gain cells for shaping circuits etc, given
10Vpp input signals.  I've found 2N4391 to be a bit fussy in this role,
although it's great for resetting sawcore integrators.  2N4392 would
probably be better.  

> I love 2SK363 best.
> Or, 2N4391-4393 (and similar)
> 
> Taku
> 
> (2011/08/05 6:51), karl dalen wrote:
> > Witch JFET would be your no1: choice for simple AC Volt divider 
> > applications (signal to GND)? Some say the 2SK30ATM are 
> particularly 
> > suited.?
> >
> > Don't matter where Vgs off are positioned , a large ohmic 
> region are 
> > preferable since the FET are linearized by a MCU anyway. 
> Costly Vishay 
> > special FETs only? No?
> >
> > Regards
> > KD
> >
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