Today's Message Index:
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1. 08:20 AM - Re: best practices for Molex? (Robert L. Nuckolls, III)
2. 09:08 AM - Re: best practices for Molex? (Kent or Jackie Ashton)
3. 10:04 AM - Re: best practices for Molex? (Charlie England)
4. 11:34 AM - Re: TypeS Lithium Jump starter (rparigoris)
5. 08:13 PM - Re: Re: TypeS Lithium Jump starter (Robert L. Nuckolls, III)
6. 08:40 PM - Re: best practices for Molex? (Robert L. Nuckolls, III)
Message 1
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| Subject: | Re: best practices for Molex? |
> I've seen come 'conventions' but they tend to
> be institutional . . .
In the dozens of 'design to specs' products
I've worked, I don't recall any specification
dictating gender of the pins EXCEPT where
the device was form, fit and function for
an existing device.
Virtually all customers had a preference for
the style of connector but the pin out gender
was left open. Most connectors are
relatively 'scoop proof' these days as
illustrated by this combination of pins
and housing . . .
Bob . . .
Message 2
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| Subject: | Re: best practices for Molex? |
Heres a good discussion of Molex connectors
http://tech.mattmillman.com/info/crimpconnectors/
-Kent
> On Jul 20, 2020, at 12:54 PM, prestonkavanagh <preston.kavanagh@gmail.com> wrote:
>
>
> I'm wiring one of my first connectors, a 4-wire molex from wingtip light back
to the wiring conduit and ultimately a faston tab on a panel switch. Is there
a standard for which side is male and which female?
>
> The radios tend to come with female plugs, so I thought to extend that: everything
that points either to center line or the panel is male. But is there a
standard practice? And is there a FAQ on best practices? Did I miss the relevant
section in the book? Thanks for the ongoing help - I'll be paying it forward!
>
> --------
> PBK3
> PA-12, BD-4, RV6a, gliders
>
>
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=497374#497374
>
>
>
>
>
>
>
>
>
Message 3
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| Subject: | Re: best practices for Molex? |
I *try* to keep power supply terminals female if possible. Murphy seems to
hang around my shop too much and even with the shroud around the pins on
Dsub connectors, I can find a way to drop one perfectly vertical on a bolt
head, etc, and find the power pin in a 37 pin connector.
To answer a question you didn't ask...Would I use a typical Molex if there
were any other option? No. Emphatically, NO. I know that a lot of mfgrs use
them and a lot of people have good results with them, but I've seen
countless examples in industrial equipment go intermittent or fail due to
corrosion on the mating surfaces, likely due to vibration. I've had less
than stellar service from them in a/c, too, with really poor performance
from the small ones used for signal wires. My go-to connector for about 90%
of stuff in the a/c is the subD. Anything under about 7A (with the machined
pins), and I'll go higher by ballasting a pair of pins on occasion. Gold
plated so no corrosion issues like Molex, and can be much more compact for
2 pin stuff by just using the pins/sockets/heat shrink with no shell as
detailed in the AEC book.
FWIW...
Charlie
On Tue, Jul 21, 2020 at 11:17 AM Kent or Jackie Ashton <kjashton@vnet.net>
wrote:
> kjashton@vnet.net>
>
> Here=99s a good discussion of Molex connectors
> http://tech.mattmillman.com/info/crimpconnectors/
>
> -Kent
>
> > On Jul 20, 2020, at 12:54 PM, prestonkavanagh <
> preston.kavanagh@gmail.com> wrote:
> >
> preston.kavanagh@gmail.com>
> >
> > I'm wiring one of my first connectors, a 4-wire molex from wingtip ligh
t
> back to the wiring conduit and ultimately a faston tab on a panel switch.
> Is there a standard for which side is male and which female?
> >
> > The radios tend to come with female plugs, so I thought to extend that:
> everything that points either to center line or the panel is male. But i
s
> there a standard practice? And is there a FAQ on best practices? Did I
> miss the relevant section in the book? Thanks for the ongoing help - I'l
l
> be paying it forward!
> >
> > --------
> > PBK3
> > PA-12, BD-4, RV6a, gliders
> >
> >
> >
> >
> > Read this topic online here:
> >
> > http://forums.matronics.com/viewtopic.php?p=497374#497374
> >
> >
> >
> >
> >
> >
> >
> >
> >
>
>
===========
===========
===========
===========
===========
>
>
Message 4
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| Subject: | Re: TypeS Lithium Jump starter |
Hi Group
A note on jump starter packs. I purchased a 4,000amp 12 volt jump starter a while
back. I was working on a project and needed 1,500 watts for 15 seconds (a
little less than 140 amps) and not go below 10.9 volts. Although after speaking
with mfg. they did indeed test and saw 4,000 amps, it was for some nanosecond
at some way low voltage. Here's the real poop: it could hardly hold up 35 amps
for 15 seconds!
https://www.northerntool.com/shop/tools/product_200676383_200676383
Their# is 216-464-8131
Their 4,000 amp unit can put out ~ 40 amps for 3 seconds at minimum of 10.9 volts,
after 15 seconds down to ~35 amps and if it were cold probably 20 or 25 amps.
The battery is only 8aH.
Ron P.
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=497389#497389
Message 5
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| Subject: | Re: TypeS Lithium Jump starter |
At 01:31 PM 7/21/2020, you wrote:
>
>Hi Group
>A note on jump starter packs. I purchased a 4,000amp 12 volt jump
>starter a while back. I was working on a project and needed 1,500
>watts for 15 seconds (a little less than 140 amps) and not go below
>10.9 volts. Although after speaking with mfg. they did indeed test
>and saw 4,000 amps, it was for some nanosecond at some way low
>voltage. Here's the real poop: it could hardly hold up 35 amps for 15 seconds!
>https://www.northerntool.com/shop/tools/product_200676383_200676383
Yeah, there's been a host of similar products
with similar track records. Some of you may
remember the sensational Bolder Technologies,
thin metal film jelly-roll cells that caused
a big stir about 22 years ago:
https://tinyurl.com/yyw6a6j6
https://tinyurl.com/y42v9ztj
https://tinyurl.com/mu8oe6c
We had a sample array of cells in a 12v
configuration test at B&C about a year
or so earlier. Yup, those 2 A.h. cells
would dump current at over 400A when
loaded down to 9v!
They had a boat load of manufacturing
process problems to solve and never quite
made it. I think the company has been
sold several times and presently languishes
in India?
But just because a cell is small does not
necessarily mean it's not up to the stated
task. Take the EarthX product I published
test data on a few days ago. After 6+ years
the battery still stores 10+ a.h. of energy.
When loaded to 9v this morning, it still
offered respectable 400+ amps of cranking
current.
The cell's robustness is exceedingly
sensitive to production and design variables.
The smaller the cell, the greater the
sensitivity. EarthX appears to have their
ducks marching along in good order.
But as Ron has illustrated, not everyone
is so talented.
Bob . . .
Message 6
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| Subject: | Re: best practices for Molex? |
At 12:01 PM 7/21/2020, you wrote:
>=C2 I *try* to keep power supply terminals female
>if possible. Murphy seems to hang around my shop
>too much and even with the shroud around=C2
>the=C2 pins on Dsub=C2 connectors, I can find a way
>to drop one perfectly vertical on a bolt head,
>etc, and find the power pin in a 37 pin connector.=C2 =C2
>
>To answer a question you didn't ask...Would I
>use a typical Molex if there were any other
>option? No. Emphatically, NO. I know that a lot
>of mfgrs use them and a lot of people have good
>results with them, but I've seen countless
>examples in industrial equipment go intermittent
>or fail due to corrosion on the mating surfaces,
>likely due to vibration. I've had less than
>stellar service from them in a/c, too, with
>really poor performance from the small ones used
>for signal wires. My go-to connector for about
>90% of stuff in the a/c is the subD. Anything
>under about 7A (with the machined pins), and
>I'll go higher by ballasting a pair of pins on
>occasion. Gold plated so no corrosion issues
>like Molex, and can be much more compact for 2
>pin stuff by just using the pins/sockets/heat
>shrink with no shell as detailed in the AEC book.
>
>FWIW...
>
>Charlie
Agreed. Paralleling ballasted
pins was employed on the Beech Horizon's DC
power distribution system. I first used
them on a power distribution controller
in the GQM-163 SSST prototype
https://tinyurl.com/yxwsd5p9
https://tinyurl.com/8x5rssq
https://tinyurl.com/6myc494
When considering a new connector
requirement, my first thought is
to figure out why a d-Sub WONT work.
Bob . . .
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