The people doing the experiments do not have a good idea of or feel for
what they are laying with.

BUT it does sound as if they MAY have "discovered" an affect that could be
useful.
It's possible that what is being reported is due to gate insulation damage,
but it doe not seem likely. The result they are getting seems more likely
to produce the result observed after V+ biasing that inverse biasing - but
their "model" suggests the opposite. ie their result is the opposite of
their prediction whereas I'd expect to see what they do see if it worked at
all.

When I have done this on various past occasions I have ended up in a
majority of cases with massively depletion mode devices requiring Vgs of
nothing or anything you wish to be fully enhanced, essentially sub milliohm
Rdson (and also Rdsoff) and Rgs  and Rgd essentially infinite. In a small
fraction of cases I'd get Rgs of about zero and in such cases Rdson/Rdsoff
might be near infinite.


________________________

aka: MOSFETs that die under power tend to fail DS short, gx open. Sometimes
you get gs short and DS open and sometimes (less often) dsg are all short.

FWIW zeners do not make reliable crowbars. 2W - 10W range glass beads tend
to fail short somewhat more than not, bu open often enough to make neither
failure reliable as a basis of a protection system.

      R

On 25 October 2016 at 00:31, Van Horn, David <
david.vanhorn@backcountryaccess.com> wrote:

>
> Sadly this is as well thought out as a lot of their projects.
>
>
> -----Original Message-----
> From: piclist-bounces@mit.edu [mailto:piclist-bounces@mit.edu] On Behalf
> Of Bob Blick
> Sent: Sunday, October 23, 2016 6:48 PM
> To: piclist@mit.edu
> Subject: [EE] Intentional MOSFET gate voltage overdrive
>
> https://hackaday.io/project/16616-your-mosfet-is-not-good-
> enough-then-modify-it
>
> A Hackaday post suggests that a MOSFET's gate threshold voltage can be
> permanently shifted by applying a one-time momentary gate overvoltage.
>
> "Turn your normal MOSFET into a low-threshold MOSFET in seconds"
>
> Sounds like poking holes in a condom to me - not a good idea :)
>
> Bob
>
> --
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