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From: John Larkin on 8 Apr 2010 21:03
On Thu, 8 Apr 2010 17:30:42 -0700 (PDT), "oparr(a)hotmail.com"
<oparr(a)hotmail.com> wrote:

>>Yet another amateur idiot who thinks he's invented something new, and
>>keeps it a secret because he thinks it's worth something. Wrong and
>>wrong.
>
>Yawn....Sleepy...Too many posts
>to........................zzzzzzzzzzzz
>
>

Ah, you're going away now. Good news.

John

From: John Larkin on 8 Apr 2010 23:11
On Thu, 8 Apr 2010 09:55:13 -0700 (PDT), "oparr(a)hotmail.com"
<oparr(a)hotmail.com> wrote:

>>He's cagey enough about
>>it that either (a) he thinks it's a genuine crown jewel or (b) he
>>doesn't want to get his tailfeathers singed by bragging about a kluge.
>
>I haven't the faintest idea as to what my "circuit" is being likened
>to. This thread is a followup (sort of) to an earlier thread "High
>side current monitor with latch" in which Joerg gives me some advice
>(albeit old school) regarding MOSFET protection.
>
>After throughly investigating the characteristics of MOSFETs, it
>dawned on me that they are probably the easiest of all transistors to
>protect. It also dawned on me that others, including Joerg, were
>probably aware ot this already but have decided to keep this to
>themselves. Hence this thread.

If you're suggesting that one can monitor Vds of a mosfet, and when it
exits its resistive region turn on a bipolar, and steal the gate
drive, that's a great idea. So great it's been used for a dog's age,
or maybe two.

>
>It is my opinion, based on both characteristics and test results, that
>a MOSFET can be operated very close to its absolute maximum
>thresholds, without damage, when used in conjunction with a single
>small signal BJT. Not being one to ever give anything on a silver
>platter (too expensive), that's about all you need to know from me.

Just be careful to turn it mostly off before Vds gets too big. A "300
watt" mosfet can explode at 100 watts if Vds is large. Switchmode fets
don't like being used as linear parts.

John

From: oparr on 10 Apr 2010 07:58
>Ah, you're going away now. Good news.

Yep, riding off into the sunset. I'll post the "circuit" on my website
for maximum mileage. A nanosecond of fame here just isn't woth it. You
probably know the adage regarding "throwing your pearls to swines".
Farewell "screwface Allison".


On Apr 8, 9:03 pm, John Larkin
<jjlar...(a)highNOTlandTHIStechnologyPART.com> wrote:
>
From: John Larkin on 10 Apr 2010 11:02
On Sat, 10 Apr 2010 04:58:42 -0700 (PDT), "oparr(a)hotmail.com"
<oparr(a)hotmail.com> wrote:

>>Ah, you're going away now. Good news.
>
>Yep, riding off into the sunset. I'll post the "circuit" on my website
>for maximum mileage. A nanosecond of fame here just isn't woth it. You
>probably know the adage regarding "throwing your pearls to swines".

You're right, we should be more tolerant of affected fatheads.

John

From: oparr on 10 Apr 2010 11:23
What's that? Can't hear you. I know you're mumbling something but I'm
"hills and vales" away by now.


On Apr 10, 11:02 am, John Larkin
<jjlar...(a)highNOTlandTHIStechnologyPART.com> wrote:
>
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