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PICList Thread
'Weatherized DC Power jack'
1998\06\23@200803 by Lewis H. Cobb

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Not exactly a PIC topic but it's being used for a gadget that has a pic in
it - :)

I am looking for a small DC power jack - panel mounted - like a 2.1 or
2.5mm "barrel" type that are used in many rechargable devices, that is
somewhat "weather resistant".  The existing ones that I have seen are
nowhere near usable outdoors as they have openings inside that let moisture
and water in quite freely.  I'd like to make a pic device I am working on,
rechargable and this would be a simple way to provide a connection if it
were moisture resistant.  BTW - the enclosure is metal - hence I can't
easily use metal "tabs" that are seen on cell phones - besides - this would
a 4 zillion dollar industrial design/injection molding process anyway :).

Thanks for any help people can provide.

Regards,
Lewis

1998\06\23@232945 by Sean Breheny

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On Tue, 23 Jun 1998, Lewis H. Cobb wrote:

> Not exactly a PIC topic but it's being used for a gadget that has a pic in
> it - :)
Hi Lewis,

Hey, I'm probably one of the worst offenders in this regard :)

{Quote hidden}

I think that you are looking for the wrong type of jack. I don't think
that there are anytype of coaxial power jacks that are really
"weatherproof". They are inherently exposed to the weather due to the
fact that they are not locking connectors so the hole in the front is not
sealed when the connection is made. I have seen some types of Molex
connectors with plastic "boots" on them to protect them from the elements.
You might look into those.

I am curious as to why your device needs to be easily disconnectable if
it is designed to operate outdoors? If you don't care about being
non-standard, you might consider using connectors designed for outdoor
120VAC or even coaxial RF connectors. These are likely to be much more
common and cheaper.

> Thanks for any help people can provide.
>
> Regards,
> Lewis
>

Good luck,
Sean

1998\06\24@092049 by Dan Larson

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You could also over-engineer things and try something like
inductive power coupling!  Have an inductive coil on the
inside of the box.  The charging device on the outside would
also have an inductive coil.  An AC current through the
charging coil would be coupled to the pickup coil, where it
would then be rectified and used to charge the device's
betteries.

On Tue, 23 Jun 1998 20:56:45 -0400, Sean Breheny wrote:

{Quote hidden}

1998\06\24@122033 by Lewis H. Cobb

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I don't really need the jack to be "operated" outdoors - and in that
regard, I can come up with a small rubber "hood" of sorts to cover it up
when the unit is being used and it's exposed to the elements - that was my
next approach.  I have been looking into the RF connectors as well - that's
not a bad idea at all.

This piclist is a good source for ideas!

Thanks

Lewis


At 08:56 PM 6/23/98 -0400, you wrote:
{Quote hidden}

1998\06\24@123026 by 'Grif' w. keith griffith

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At 07:51 AM 6/24/98 +0000, you wrote:
>You could also over-engineer things and try something like
>inductive power coupling!
>
>On Tue, 23 Jun 1998 20:56:45 -0400, Sean Breheny wrote:
>
>>On Tue, 23 Jun 1998, Lewis H. Cobb wrote:
>>
>>> I am looking for a small DC power jack - panel mounted - like a 2.1 or
>>> 2.5mm "barrel" type that are used in many rechargable devices, that is
>>> somewhat "weather resistant".

Didn't switchcraft build a snap cover for their line of jacks?  I'll look
and see if I can find a real catalog.



'Grif' N7IVS

1998\06\24@133549 by 'Grif' w. keith griffith

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To follow up,,, Little metal snap cover looks like a toilet seat ;-)?  Same
kind of thing on 1/4 phone jacks.  I've a sample comming, I'll let you know
how it fits.  The part number is
2c1072 from switchcraft

I was also looking at one of our gps units for the field by rockwell,,,
they have a really hi dollar connector cover, if I can run the info on that
down, I'll pass it along.



'Grif' N7IVS

1998\06\24@151244 by Mike Keitz

picon face
On Wed, 24 Jun 1998 10:59:25 -0300 "Lewis H. Cobb" <spam_OUTcobbTakeThisOuTspamZEUS.EE.UNB.CA>
writes:
>I don't really need the jack to be "operated" outdoors

>This piclist is a good source for ideas!

Here's some more.  Put a diode in the box so battery voltage doesn't feed
back to the jack.  If the jack gets wet while voltage is applied, it will
corrode rapidly.  Ideally, apply AC to the jack for charging to minimize
corrosion.  Put the jack in a sepearte compartment and seal it up so any
water that does leak in won't get to the rest of the circuit.

If you'd like a "drop-in" charging arrangement, buy a hermetically sealed
feedthrough pin.  Put a pin in a counterbored hole so the end is level
with the box.  Use box ground for the other charge connection.  The
charger would have two springs that make contact.  The charger should
defintiely have an LED or some indication that current is flowing,
indicating good contact is made.



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1998\06\24@175212 by Lewis H. Cobb

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Mike - I like the idea of the drop-in charger arrangement a lot better as I
can come up with better sealing techniques and have these "stainless screw
heads" or something similar in a small block of nylon or delrin.  Kind of
like the way  Mortorola does it for the UHF radios - albeit on a much
smaller volume ;)

On the charger end, I spent a bit of time scouring for those shiny, 1/4"
diameter "spring-loaded" spikes that you see in some of the commercial
2-way radio chargers - no luck though - all I could find was the ATE
fixturing pins - they are much too small and flimsy to use in this sort of
application - do you have any other ideas on this front?
Thanks
Lewis



At 02:07 PM 6/24/98 -0400, you wrote:
{Quote hidden}

1998\06\25@005207 by tjaart

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Lewis H. Cobb wrote:

> I don't really need the jack to be "operated" outdoors - and in that
> regard, I can come up with a small rubber "hood" of sorts to cover it up
> when the unit is being used and it's exposed to the elements - that was my
> next approach.  I have been looking into the RF connectors as well - that's
> not a bad idea at all.

If it will never be opened by the user, you can use
fulcanising tape. It is cheap and seals 100%

--
Friendly Regards

Tjaart van der Walt
tjaartspamKILLspamwasp.co.za

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1998\06\25@154627 by Morgan Olsson

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At 18:27 1998-06-24 -0300, you wrote:
...
>On the charger end, I spent a bit of time scouring for those shiny, 1/4"
>diameter "spring-loaded" spikes that you see in some of the commercial
>2-way radio chargers - no luck though - all I could find was the ATE
>fixturing pins - they are much too small and flimsy to use in this sort of
>application - do you have any other ideas on this front?
>Thanks
>Lewis

It don«t have to be spring loaded if you can arrange so it stands on the
two contacts by it«s own weight, balancing in some way.

I«ve got a rechargeable drill that does that.

/Morgan
/  Morgan Olsson, MORGANS REGLERTEKNIK, SE-277 35 KIVIK, Sweden \
\  EraseMEmrtspam_OUTspamTakeThisOuTiname.com, ph: +46 (0)414 70741; fax +46 (0)414 70331    /

1998\06\26@055913 by Larry G. Nelson Sr.

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This will work but efficiency is low for inductive power coupler unless you
can sense a docked condition and then the coils need to be in close proximity.

At 07:51 AM 6/24/98 +0000, Dan Larson wrote:
{Quote hidden}

moisture
>>> and water in quite freely.  I'd like to make a pic device I am working on,
>>> rechargable and this would be a simple way to provide a connection if it
>>> were moisture resistant.  BTW - the enclosure is metal - hence I can't
>>> easily use metal "tabs" that are seen on cell phones - besides - this
would
{Quote hidden}

Larry G. Nelson Sr.
L.Nelsonspamspam_OUTieee.org
http://www.ultranet.com/~nr


'Weatherized DC Power jack'
1998\07\09@174330 by 'Grif' w. keith griffith
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At 07:51 AM 6/24/98 +0000, you wrote:
>You could also over-engineer things and try something like
>inductive power coupling!
>
>On Tue, 23 Jun 1998 20:56:45 -0400, Sean Breheny wrote:
>
>>On Tue, 23 Jun 1998, Lewis H. Cobb wrote:
>>
>>> I am looking for a small DC power jack - panel mounted - like a 2.1 or
>>> 2.5mm "barrel" type that are used in many rechargable devices, that is
>>> somewhat "weather resistant".

Didn't switchcraft build a snap cover for their line of jacks?  I'll look
and see if I can find a real catalog.

To follow up,,, Little metal snap cover looks like a toilet seat ;-)?  Same
kind of thing on 1/4 phone jacks.  I've a sample comming, I'll let you know
how it fits.  The part number is
2c1072 from switchcraft

I was also looking at one of our gps units for the field by rockwell,,,
they have a really hi dollar connector cover, if I can run the info on that
down, I'll pass it along.

************************************
And to finish the thread?

The gps unit weatherproof cover was built as part of the case, with a built
in o-ring type seal.  Really nice, but has nothing to do with the connector
itself.

The Switchcraft part number   2C1072   Description unknown, but is a
weather resistant, spring loaded cover, black, that mounts with the barrel
connector.  My description from befor as a tiny toilet seat cover is about
the best I can do for a visual.

Fits on the  Switchcraft part number   712A coaxial power jack just fine
this type power jack comes with both 2.1 and 2.5mm center pins, that are
'split' and IMHO hold the plug a bunch better than the jacks with the solid
center pin.  I'm using peak charging and any intermintent in the charge
circuit will cause a false peak, dropping the charge to a maintanence value.

The fit on the weather cover is a bit fussy about how much of the power
jack sticks out, to keep the rubber boot flush with the surface of the
power jack, but other than that, looks like a real good item.  I'd expect
the rubber seal to deform to fit after a day or so, but it looks like a new
normal addition to my goodie stash.



'Grif' N7IVS

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