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From: oparr on 6 Apr 2010 22:11
>If you're not prepared to show your work, what was the purpose of the
>original post?

There are well kept secrets in everyday electronics.


On Apr 6, 7:31 pm, John Fields <jfie...(a)austininstruments.com> wrote:
>
From: John Fields on 6 Apr 2010 22:28
On Tue, 6 Apr 2010 19:11:24 -0700 (PDT), "oparr(a)hotmail.com"
<oparr(a)hotmail.com> wrote:

>On Apr 6, 7:31�pm, John Fields <jfie...(a)austininstruments.com> wrote:

>>If you're not prepared to show your work, what was the purpose of the
>>original post?
>
>There are well kept secrets in everyday electronics.

---
That's certainly true, but keeping those secrets safe usually involves
maintaining a low profile and not blabbing about them in public.

"Loose lips sink ships", you know, so, again, what was the purpose of
the original post?


JF
From: Jim Thompson on 6 Apr 2010 22:43
On Tue, 06 Apr 2010 21:28:33 -0500, John Fields
<jfields(a)austininstruments.com> wrote:

>On Tue, 6 Apr 2010 19:11:24 -0700 (PDT), "oparr(a)hotmail.com"
><oparr(a)hotmail.com> wrote:
>
>>On Apr 6, 7:31�pm, John Fields <jfie...(a)austininstruments.com> wrote:
>
>>>If you're not prepared to show your work, what was the purpose of the
>>>original post?
>>
>>There are well kept secrets in everyday electronics.
>
>---
>That's certainly true, but keeping those secrets safe usually involves
>maintaining a low profile and not blabbing about them in public.
>
>"Loose lips sink ships", you know, so, again, what was the purpose of
>the original post?
>
>
>JF

He's a Larkin spin-off... allusions/illusions of grandeur :-)

...Jim Thompson
--
| James E.Thompson, CTO | mens |
| Analog Innovations, Inc. | et |
| Analog/Mixed-Signal ASIC's and Discrete Systems | manus |
| Phoenix, Arizona 85048 Skype: Contacts Only | |
| Voice:(480)460-2350 Fax: Available upon request | Brass Rat |
| E-mail Icon at http://www.analog-innovations.com | 1962 |

The only thing bipartisan in this country is hypocrisy
From: John Larkin on 7 Apr 2010 01:13
On Tue, 6 Apr 2010 19:11:24 -0700 (PDT), "oparr(a)hotmail.com"
<oparr(a)hotmail.com> wrote:

>>If you're not prepared to show your work, what was the purpose of the
>>original post?
>
>There are well kept secrets in everyday electronics.
>

Since you won't reveal your circuit, maybe you can explain your
business model to us.

John

From: Phil Hobbs on 7 Apr 2010 17:42
On 4/6/2010 12:31 PM, John Larkin wrote:
> On Mon, 5 Apr 2010 17:23:01 -0700 (PDT), "oparr(a)hotmail.com"
> <oparr(a)hotmail.com> wrote:
>
>> No relatively expensive high side current monitor, comparator or latch
>> ICs either. You're wasting your time and money using these items if
>> all you need is a fast electronic "fuse". A single BJT, in conjunction
>> with the MOSFET, is all that is required for UVLO, overcurrent and
>> short circuit protection. Throw in a voltage reference, like the
>> TL431, if the switch has to cover a wide voltage range.
>
> I sort of doubt it.
>
> John
>

He can do most of that (if he's prepared to be crappy enough) by using
one of those beta-dependent BJT circuits of yours--stick a BJT in series
with the source of the MOSFET, and give it just enough base current to
almost saturate at the highest current you want to allow.

NOT how you'd want to do it in real life, but it'd limit the current and
so on.

Cheers

Phil Hobbs

--
Dr Philip C D Hobbs
Principal
ElectroOptical Innovations
55 Orchard Rd
Briarcliff Manor NY 10510
845-480-2058
hobbs at electrooptical dot net
http://electrooptical.net
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