Which N Or P Power MOSFETs ?...

[Phil Allison]

::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::

John Larkin Highland Technology, Inc

The best designs are necessarily accidental.

** Reads much like a: \" The customer is Always Right \" sign.

IOW it\'s quite meaningless and meant to be.

But made me think about the luck element in producing a good design, not just on paper or a prototype - but the final thing.
It\'s lucky if:

1. There are no design mistakes or shortcomings.
2. No components have defects or perform under spec.
3. Assembly is without flaw.
4. Customers want to buy them.
5. The selling price is competitive and no other decides to under cut.
6. The Chines don\'t copy it.


...... Phil

 

[Bill Sloman]

On Sunday, November 29, 2020 at 2:00:54 PM UTC+11, palli...@gmail.com wrote:

::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::


John Larkin Highland Technology, Inc

The best designs are necessarily accidental.

** Reads much like a: \" The customer is Always Right \" sign.

IOW it\'s quite meaningless and meant to be.

But made me think about the luck element in producing a good design, not just on paper or a prototype - but the final thing.
It\'s lucky if:

1. There are no design mistakes or shortcomings.

There always are, but most of them don\'t do enough damage to matter,

> 2. No components have defects or perform under spec.

It doesn\'t matter if you catch the defect when you test before you ship.

> 3. Assembly is without flaw.

It doesn\'t matter if you catch the flaw when you test before you ship.

> 4. Customers want to buy them.

Why design stuff that people don\'t want to buy? I\'ve done it for fun, but stopped the design process at the point where it got tedious of expensive.

> 5. The selling price is competitive and no other decides to under cut.

Which you can\'t find out until you have started selling the product. You can make a well-informed estimate of what might be a competitive selling price, and work out how much your potential competitors can afford to shave off their prices, but it\'s a crap-shoot.

> 6. The Chinese don\'t copy it.

They won\'t bother if the market is small and local. If you are selling into a international mass market, which does require high volume production and expensive tooling up, they are always potential competition. Most people who produce in high volume sub-contract lots of the work to Chinese manufacturers, who are famous for making more parts than they get paid for and assembling the extra parts into a competing product, if they can.

--
Bill Sloman, Sydney

 

[John Larkin]

On Sat, 28 Nov 2020 19:00:48 -0800 (PST), Phil Allison
<pallison49@gmail.com> wrote:

::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::


John Larkin Highland Technology, Inc

The best designs are necessarily accidental.


** Reads much like a: \" The customer is Always Right \" sign.

IOW it\'s quite meaningless and meant to be.

Possibly meaningless to you. We are in different businesses.

But made me think about the luck element in producing a good design, not just on paper or a prototype - but the final thing.
It\'s lucky if:

1. There are no design mistakes or shortcomings.
2. No components have defects or perform under spec.
3. Assembly is without flaw.
4. Customers want to buy them.
5. The selling price is competitive and no other decides to under cut.
6. The Chines don\'t copy it.


..... Phil





--

John Larkin Highland Technology, Inc trk

The cork popped merrily, and Lord Peter rose to his feet.
\"Bunter\", he said, \"I give you a toast. The triumph of Instinct over Reason\"

 

[Bill Sloman]

On Sunday, November 29, 2020 at 3:07:19 PM UTC+11, John Larkin wrote:

On Sat, 28 Nov 2020 19:00:48 -0800 (PST), Phil Allison
palli...@gmail.com> wrote:

The best designs are necessarily accidental.


** Reads much like a: \" The customer is Always Right \" sign.

IOW it\'s quite meaningless and meant to be.

Possibly meaningless to you. We are in different businesses.

Perhaps not as different as John Larkin likes to think. Both sets of customers are fairly unsophisticated about electronics, but pretty rigorous about the results they expect to get.

--
Bill Sloman, Sydney

 

[Phil Allison]

Bill Sloman wrote:
==============
JL opined:

The best designs are necessarily accidental.


** Reads much like a: \" The customer is Always Right \" sign.

IOW it\'s quite meaningless and meant to be.

Possibly meaningless to you. We are in different businesses.

Perhaps not as different as John Larkin likes to think.
Both sets of customers are fairly unsophisticated about electronics,
but pretty rigorous about the results they expect to get.

** Yep - perfection is merely expected.

For a tiny cost and no thanks or praise is ever likely.



....... Phil

 

[Bill Sloman]

On Friday, November 27, 2020 at 2:53:34 AM UTC+11, John Larkin wrote:

On Tue, 24 Nov 2020 23:46:56 -0500, Phil Hobbs
pcdhSpamM...@electrooptical.net> wrote:

On 11/24/20 10:43 PM, jla...@highlandsniptechnology.com wrote:
On Tue, 24 Nov 2020 17:42:14 -0500, Phil Hobbs
pcdhSpamM...@electrooptical.net> wrote:

On 11/23/20 6:57 PM, jla...@highlandsniptechnology.com wrote:
On Mon, 23 Nov 2020 15:17:31 -0500, Phil Hobbs
pcdhSpamM...@electrooptical.net> wrote:

On 11/23/20 10:42 AM, jla...@highlandsniptechnology.com wrote:
On Sun, 22 Nov 2020 16:34:04 -0500, Phil Hobbs
pcdhSpamM...@electrooptical.net> wrote:

On 11/19/20 7:42 PM, John Larkin wrote:
On Thu, 19 Nov 2020 15:25:29 -0800 (PST), George Herold
gghe...@gmail.com> wrote:

On Thursday, November 19, 2020 at 4:51:32 PM UTC-5, John Larkin wrote:
On Thu, 19 Nov 2020 09:12:04 -0800 (PST), George Herold
gghe...@gmail.com> wrote:

On Thursday, November 19, 2020 at 11:51:58 AM UTC-5, piglet wrote:
On 19/11/2020 15:52, George Herold wrote:
On Thursday, November 19, 2020 at 10:37:06 AM UTC-5, jla...@highlandsniptechnology.com wrote:
On Thu, 19 Nov 2020 05:31:20 -0800 (PST), George Herold
gghe...@gmail.com> wrote:

On Thursday, November 19, 2020 at 7:25:48 AM UTC-5, Jeff Urban wrote:

<snip>

From our point of view the main problem working with large groups at
clients is that they\'re generally seriously underdamped. We\'ve learned
to nitpick every specification document they send us--not so much so
we can understand what they want, but so _they_ all have to understand it.

Awhile back we lost a potentially good customer by being too polite
about their specifications document for an ultraquiet laser. Turned out
that the guy who wrote it (and illustrated it profusely) thought we were
replacing one vendor\'s lasers, whereas the rest of their team wanted us
to replace their other vendor\'s laser. They just hadn\'t read their own
document carefully.

We actually fished that one out, and built greatly improved replacements
for _both_ vendors\' lasers within the specified budget, but then their
project lead left the company and the project got cancelled. On the
plus side, we now have this super quiet laser system that we can sell to
other folks.

The bigger any group (engineers, soldiers, rabbits) the more powerful
group dynamics becomes.

Depending how well run they are.

> Peer approval becomes the dominant force. Fun things can happen, like wars.

Peers aren\'t the whole group. What matters is the approval of the people who know what they are talking about - or at least that is what matters in a well run group - and they do tend to agree.

When people who think they know what they are talking about start throwing their weight around the situation can - and frequently does - deteriorate.

--
Bill Sloman, Sydney

 

[legg]

On Sat, 21 Nov 2020 08:10:50 -0800, jlarkin@highlandsniptechnology.com
wrote:

--

John Larkin Highland Technology, Inc

The best designs are necessarily accidental.

If it\'s an accident, it\'s a discovery, not a design.

After that, everybody actually knew it, all along . . . .

RL

 

[John Larkin]

On Thu, 26 Nov 2020 12:46:19 -0500, legg <legg@nospam.magma.ca> wrote:

On Sat, 21 Nov 2020 08:10:50 -0800, jlarkin@highlandsniptechnology.com
wrote:

--

John Larkin Highland Technology, Inc

The best designs are necessarily accidental.




If it\'s an accident, it\'s a discovery, not a design.

If a basic concept comes from a rarely or never explored place in the
solution space, it\'s a discovery. Deliberate, organized searches for
ideas tend to miss those places.

If it involves parts soldered to a board that people buy, it\'s a
design.

The combination can be good.

--

John Larkin Highland Technology, Inc trk

The cork popped merrily, and Lord Peter rose to his feet.
\"Bunter\", he said, \"I give you a toast. The triumph of Instinct over Reason\"

 

[John Larkin]

On Sat, 28 Nov 2020 22:13:15 -0800 (PST), Phil Allison
<pallison49@gmail.com> wrote:

Bill Sloman wrote:
==============
JL opined:


The best designs are necessarily accidental.


** Reads much like a: \" The customer is Always Right \" sign.

IOW it\'s quite meaningless and meant to be.

Possibly meaningless to you. We are in different businesses.

Perhaps not as different as John Larkin likes to think.
Both sets of customers are fairly unsophisticated about electronics,
but pretty rigorous about the results they expect to get.


** Yep - perfection is merely expected.

For a tiny cost and no thanks or praise is ever likely.



...... Phil

My customers appreciate perfection but don\'t expect it. They know that
electronics is complex and things sometimes go wrong. What they truly
appreciate is honesty about what\'s actually going on, and energetic
fixes.

One customer tried to pay us to fix one of our bugs, on the theory
that they could afford it more than we can. I\'m having an ongoing
fight with another to take blame for a problem; they insist it\'s their
fault and we insist it\'s ours.

--

John Larkin Highland Technology, Inc trk

The cork popped merrily, and Lord Peter rose to his feet.
\"Bunter\", he said, \"I give you a toast. The triumph of Instinct over Reason\"