Today's Message Index:
----------------------
1. 12:31 AM - Re: Preferred Bulkhead Disconnects (Etienne Phillips)
2. 07:02 AM - Re: Switch question (paul wilson)
3. 08:27 AM - Re: Preferred Bulkhead Disconnects (Robert L. Nuckolls, III)
4. 08:29 AM - Re: Switch question (Robert L. Nuckolls, III)
5. 08:59 AM - Re: D-Sub Connector Follow-up (Robert L. Nuckolls, III)
6. 01:29 PM - Re: [OT] Pronunciation question (Gilles Thesee)
7. 02:56 PM - Re: Dimmer Control Units (Henry Trzeciakowski)
8. 04:23 PM - Re: Switch question (William Slaughter)
9. 04:39 PM - Re: Re: Dimmer Control Units (Terry Watson)
10. 08:33 PM - Re: Preferred Bulkhead Disconnects (RALPH HOOVER)
Message 1
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| Subject: | Re: Preferred Bulkhead Disconnects |
2008/10/2 Robert L. Nuckolls, III <nuckolls.bob@cox.net>
> nuckolls.bob@cox.net>
>
> For 22 to 20 AWG wires at 4A or less, the d-subs
> are connectors of choice.
Hi Bob
Would this be 4A per wire? I'd feel very nervous about putting that amount
of current through an itty-bitty pin. Although here on the southern tip of
the dark continent, we don't get the machined pins, only the useless pressed
ones...
If think it's fine, then I'll believe you - I've just spent big bucks on
this (see attached pic) military style breakout plug, which is rated at 5A
per pin. :-(
Etienne
Message 2
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| Subject: | Re: Switch question |
Thanks Bob,
I have been following the Carling thread. Now I ask what the
Microswitch part to match the 2-10 Carling.
Sorry I did not save the Micro link, but now I need a part number.
Thanks again, Paul
======================
At 09:10 PM 10/1/2008, you wrote:
><nuckolls.bob@cox.net>
>
>At 07:13 PM 10/1/2008 -0600, you wrote:
>>
>>Can any one give me a quick answer for the amp rating of a
>>S700-2-10 switch The application is for a fuel pump that draws 8.5
>>amps steady state.
>>Thanks, Paul
>
> It should be okay for this application. We've seen
> a rash of failures for the Carling switches sold
> by B&C and others . . . the ones with riveted fast-on
> tabs. Be sure and install these with LOOSE coupling
> between bundled wires and individual tabs . . . something
> like 2" of free wire that has a pretty good bend
> in it too.
>
> I'm pretty convinced that the failures observed had
> a beginning with too much mechanical stress on these
> riveted joints. Once the pressure in the joint starts
> to relax, resistance goes up and it's downhill from
> there.
>
> Bob . . .
>
> ----------------------------------------)
> ( . . . a long habit of not thinking )
> ( a thing wrong, gives it a superficial )
> ( appearance of being right . . . )
> ( )
> ( -Thomas Paine 1776- )
> ----------------------------------------
>
>
Message 3
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| Subject: | Re: Preferred Bulkhead Disconnects |
At 09:27 AM 10/2/2008 +0200, you wrote:
>2008/10/2 Robert L. Nuckolls, III
><<mailto:nuckolls.bob@cox.net>nuckolls.bob@cox.net>
>><<mailto:nuckolls.bob@cox.net>nuckolls.bob@cox.net>
>>
>>For 22 to 20 AWG wires at 4A or less, the d-subs
>>are connectors of choice.
>
>Hi Bob
>
>Would this be 4A per wire? I'd feel very nervous about putting that amount
>of current through an itty-bitty pin.
See:
http://aeroelectric.com/Mfgr_Data/Connectors/Positronic/HDC_Series.pdf
Note contact current rating of 7.5A. In aircraft wire
bundles this assumes a 20AWG wire. Of course, this
drops to what ever the smaller wire is de-rated to
for bundling . . . 5A in the case of 22AWG.
Conservative designers will look at total connector
current density and de-rate further if most or all
of the pins are continuously loaded to max rated.
The open barrel d-sub pins are generally rated the same electrically
but they're much more process sensitive to the installation of
single pins by the neophyte technician using tools like:
http://aeroelectric.com/Pictures/Tools/Crimp_Tools/bct-1.jpg
http://aeroelectric.com/Pictures/Tools/Crimp_Tools/obc-1.jpg
The machined pins are essentially mil-spec and installed
with either an inexpensive ratchet-handled 4-quadrant
crimp tool like . . .
http://aeroelectric.com/Pictures/Tools/Crimp_Tools/rct-3.jpg
or the super-cool, $high$ tool like . . .
http://aeroelectric.com/Pictures/Tools/Crimp_Tools/4-Quad/Daniels_4-Quad_1.jpg
http://aeroelectric.com/Pictures/Tools/Crimp_Tools/4-Quad/Daniels_4-Quad_2.jpg
http://aeroelectric.com/Pictures/Tools/Crimp_Tools/4-Quad/Daniels_4-Quad_3.jpg
All of which produce a consistent installation of a
machined pin.
Although here on the southern tip of the dark continent, we don't get the
machined pins,
only the useless pressed ones...
Steinair, and B&C both stock them.
>If think it's fine, then I'll believe you - I've just spent big bucks on
>this (see attached pic) military style breakout plug, which is rated at 5A
>per pin. :-(
Then the $time$ invested to swap horses right now
is probably not a good investment. For others watching
this thread, know that it is possible and practical to
achieve nearly full-mil-spec connections in your small
wires using the really good pins and anybody's removable-pin
d-sub shells.
Know too that if you need to run more than 5-7 amps
though any one wire, you CAN parallel pins if you
include a 12" or so total length of 22AWG wire for
ballasting-resistance in series with each pin
(10-20 milliohms). This mall resistance washes
out pin-to-pin variables that make short-wire
paralleling risky. See:
http://www.aeroelectric.com/Pictures/Connectors/D-Subminature/Paralleled_D-Sub_Pins.jpg
I used this technique in a mil-qualified super-sonic
target
http://aeroelectric.com/Pictures/Misc/GQM_1st_Ops_Flight.jpg
power distribution controller . . .
http://aeroelectric.com/Pictures/Misc/GQM_Power_Dist.jpg
to switch 20+ amp battery feeders. I de-rated to 3A
per pin, had 12" 22AWG wire in series with each of
7 paralleled pins to effect a high current feeder
through the d-sub. It passed all the qualification tests.
Bottom line is that the lowly D-Sub is an exceedingly
good value if you can exploit the simple-ideas behind
its design and amplications.
Bob . . .
----------------------------------------)
( . . . a long habit of not thinking )
( a thing wrong, gives it a superficial )
( appearance of being right . . . )
( )
( -Thomas Paine 1776- )
----------------------------------------
Message 4
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| Subject: | Re: Switch question |
At 07:50 AM 10/2/2008 -0600, you wrote:
>
>Thanks Bob,
> I have been following the Carling thread. Now I ask what the Microswitch
> part to match the 2-10 Carling.
>Sorry I did not save the Micro link, but now I need a part number.
>Thanks again, Paul
I published that last week:
-----------------------------------------------
<nuckolls.bob@cox.net>
At 06:27 PM 9/25/2008 -0500, you wrote:
<willslau@comcast.net>
Hi Bob,
Can you furnish a list of the Microswitch part numbers to correlate to the
various switch configurations as shown in Fig 11-14, particularly the
progressive transfer switches? I have some of the Carlings on hand, but am
considering switching to the more robust product line before installing
anything. Thanks.
William Slaughter
There's a Microswitch catalog for the TL series devices on
my server at:
http://aeroelectric.com/Mfgr_Data/Switches/Microswitch_TL-Series.pdf
There is a correlation between the dash-numbers I adopted
(and B&C retained) for identifying switch functionality.
An S700-1-3 is a Micoroswitch 1TL1-3
An S700-2-10 is a Microswitch 2TL1-10
etc.
Bob . . .
Message 5
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| Subject: | Re: D-Sub Connector Follow-up |
Hi Bob
Would this be 4A per wire? I'd feel very nervous about putting that amount
of current through an itty-bitty pin.
See:
http://aeroelectric.com/Mfgr_Data/Connectors/Positronic/HDC_Series.pdf
Note contact current rating of 7.5A. In aircraft wire
bundles this assumes a 20AWG wire. Of course, this
drops to what ever the smaller wire is de-rated to
for bundling . . . 5A in the case of 22AWG.
Conservative designers will look at total connector
current density and de-rate further if most or all
of the pins are continuously loaded to max rated.
The open barrel d-sub pins are generally rated the same electrically
but they're much more process sensitive to the installation of
single pins by the neophyte technician using tools like:
http://aeroelectric.com/Pictures/Tools/Crimp_Tools/bct-1.jpg
http://aeroelectric.com/Pictures/Tools/Crimp_Tools/obc-1.jpg
The machined pins are essentially mil-spec and installed
with either an inexpensive ratchet-handled 4-quadrant
crimp tool like . . .
http://aeroelectric.com/Pictures/Tools/Crimp_Tools/rct-3.jpg
or the super-cool, $high$ tool like . . .
http://aeroelectric.com/Pictures/Tools/Crimp_Tools/4-Quad/Daniels_4-Quad_1.jpg
http://aeroelectric.com/Pictures/Tools/Crimp_Tools/4-Quad/Daniels_4-Quad_2.jpg
http://aeroelectric.com/Pictures/Tools/Crimp_Tools/4-Quad/Daniels_4-Quad_3.jpg
All of which produce a consistent installation of a
machined pin.
Although here on the southern tip of the dark continent, we don't get the
machined pins,
only the useless pressed ones...
Steinair, and B&C both stock them.
If think it's fine, then I'll believe you - I've just spent big bucks on
this (see attached pic) military style breakout plug, which is rated at 5A
per pin. :-(
Then the $time$ invested to swap horses right now
is probably not a good investment. For others watching
this thread, know that it is possible and practical to
achieve nearly full-mil-spec connections in your small
wires using the really good pins and anybody's removable-pin
d-sub shells.
Know too that if you need to run more than 5-7 amps
though any one wire, you CAN parallel pins if you
include a 12" or so total length of 22AWG wire for
ballasting-resistance in series with each pin
(10-20 milliohms). This mall resistance washes
out pin-to-pin variables that make short-wire
paralleling risky. See:
http://www.aeroelectric.com/Pictures/Connectors/D-Subminature/Paralleled_D-Sub_Pins.jpg
I used this technique in a mil-qualified super-sonic
target
http://aeroelectric.com/Pictures/Misc/GQM_1st_Ops_Flight.jpg
power distribution controller . . .
http://aeroelectric.com/Pictures/Misc/GQM_Power_Dist.jpg
to switch 20+ amp battery feeders. I de-rated to 3A
per pin, had 12" 22AWG wire in series with each of
7 paralleled pins to effect a high current feeder
through the d-sub. It passed all the qualification tests.
Bottom line is that the lowly D-Sub is an exceedingly
good value if you can exploit the simple-ideas behind
its design and applications.
Here's the tool/locator reference chart for those
of you who prowl about the hall of the auctions:
http://aeroelectric.com/Pictures/Tools/Crimp_Tools/4-Quad/Tool-Locater_Cross_Reference.jpg
Note that there's a super-pin for D-subs that handles
a single 18AWG wire or two 22AWG wires. This pin's crimp
is at the back of a long pin where the wire grip resides
outside the connector shell.
Bob . . .
----------------------------------------)
( . . . a long habit of not thinking )
( a thing wrong, gives it a superficial )
( appearance of being right . . . )
( )
( -Thomas Paine 1776- )
----------------------------------------
Message 6
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| Subject: | Re: [OT] Pronunciation question |
Robert McCallum a crit :
>
> Now, now Gilles. Lets not carry this too far. We could go on forever. Your
> command of English is excellent by the way. Far better than some whose first
> language is English.
>
Bob,
Thank you for your message.
Sorry for bothering everyone with non-electric questions.
Best regards,
--
Gilles
http://contrails.free.fr
Message 7
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| Subject: | Re: Dimmer Control Units |
Bob:
My instrument panel is about 80% complete and the next piece of hardware is
the dimmer system. I've been looking at numerous systems and controllers:
ACS has many types...
Ameri-King Light Dimmers Solid State Light
Kits
Lc-40E/LC-40 Lighting Controllers Val CLA 500 Solid
State Assembly
Multiple Circuit Solid State Dimmers
MAX DIM DIMMER Control Unit
B&C's Dimmer System
VANS ES Dimmer
Is one better than another: i.e. solid state vs using rheostats?
My plan is to have 2 systems: 1 for flight instruments and 1 for
radio/gps/transponder.
What experience or suggestions do you or anyone have....
Henry
Message 8
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"There's a Microswitch catalog for the TL series devices on
my server at:
http://aeroelectric.com/Mfgr_Data/Switches/Microswitch_TL-Series.pdf
There is a correlation between the dash-numbers I adopted
(and B&C retained) for identifying switch functionality.
An S700-1-3 is a Micoroswitch 1TL1-3
An S700-2-10 is a Microswitch 2TL1-10
etc.
Bob . . ."
You can order them through DigiKey. Note that the TL series all use screw
terminals, but Honeywell has similar switches with Fast-On Tabs. It appears
that the -50 and -70 types are only available in the TL series. The Digikey
catalog page has all the details.
William Slaughter
RV-8QB
-----Original Message-----
From: owner-aeroelectric-list-server@matronics.com
[mailto:owner-aeroelectric-list-server@matronics.com] On Behalf Of paul
wilson
Sent: Thursday, October 02, 2008 8:50 AM
Subject: Re: AeroElectric-List: Switch question
Thanks Bob,
I have been following the Carling thread. Now I ask what the
Microswitch part to match the 2-10 Carling.
Sorry I did not save the Micro link, but now I need a part number.
Thanks again, Paul
======================
At 09:10 PM 10/1/2008, you wrote:
><nuckolls.bob@cox.net>
>
>At 07:13 PM 10/1/2008 -0600, you wrote:
>>
>>Can any one give me a quick answer for the amp rating of a
>>S700-2-10 switch The application is for a fuel pump that draws 8.5
>>amps steady state.
>>Thanks, Paul
>
> It should be okay for this application. We've seen
> a rash of failures for the Carling switches sold
> by B&C and others . . . the ones with riveted fast-on
> tabs. Be sure and install these with LOOSE coupling
> between bundled wires and individual tabs . . . something
> like 2" of free wire that has a pretty good bend
> in it too.
>
> I'm pretty convinced that the failures observed had
> a beginning with too much mechanical stress on these
> riveted joints. Once the pressure in the joint starts
> to relax, resistance goes up and it's downhill from
> there.
>
> Bob . . .
>
> ----------------------------------------)
> ( . . . a long habit of not thinking )
> ( a thing wrong, gives it a superficial )
> ( appearance of being right . . . )
> ( )
> ( -Thomas Paine 1776- )
> ----------------------------------------
>
>
Message 9
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| Subject: | Re: Dimmer Control Units |
I'm not Bob and this doesn't directly answer your question, but I saw an ad
in the current (8/08) issue of Sport Aviation, page 17, for a new dimmer
that looks interesting. http://pilotlights.net/
They sell various lights and light strips and stuff too.
Terry
-----Original Message-----
From: owner-aeroelectric-list-server@matronics.com
[mailto:owner-aeroelectric-list-server@matronics.com] On Behalf Of Henry
Trzeciakowski
Sent: Thursday, October 02, 2008 5:59 PM
Subject: AeroElectric-List: Re: Dimmer Control Units
<hammer408@comcast.net>
Bob:
My instrument panel is about 80% complete and the next piece of hardware is
the dimmer system. I've been looking at numerous systems and controllers:
ACS has many types...
Ameri-King Light Dimmers Solid State Light
Kits
Lc-40E/LC-40 Lighting Controllers Val CLA 500 Solid
State Assembly
Multiple Circuit Solid State Dimmers
MAX DIM DIMMER Control Unit
B&C's Dimmer System
VANS ES Dimmer
Is one better than another: i.e. solid state vs using rheostats?
My plan is to have 2 systems: 1 for flight instruments and 1 for
radio/gps/transponder.
What experience or suggestions do you or anyone have....
Henry
Message 10
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| Subject: | Preferred Bulkhead Disconnects |
The EN3 series from switchcraft is also a good choice available in both
bulkhead and cord mount, weather tite, not difficult to solder. They are
small, light, good strain relief, inexpensive and work well for the trim
system. I also have one in the panel for a Hand held radio power/audio
interface to the audio panel. (Available from Digikey
http://dkc3.digikey.com/PDF/T083/P0394.pdf)
http://www.switchcraft.com/products/pdf_files/connector-28c_schematic.pdf
Ralph & Laura Hoover
RV7A N527LR
-----Original Message-----
From: owner-aeroelectric-list-server@matronics.com
[mailto:owner-aeroelectric-list-server@matronics.com] On Behalf Of Robert L.
Nuckolls, III
Sent: Wednesday, October 01, 2008 11:16 PM
Subject: RE: AeroElectric-List: Preferred Bulkhead Disconnects
<nuckolls.bob@cox.net>
Picked up the end of this thread late and wasn't
sure what kinds of wires were being considered.
For 22 to 20 AWG wires at 4A or less, the d-subs
are connectors of choice. They're inexpensive and
tooling for installing the machined pins is also
inexpensive. For transitions between the gawd-awful
26AWG leadwires on a RAC trim actuator, consider
this technique:
http://aeroelectric.com/articles/macservo/macservo.html
If you need to break robust wires that carry
landing lights or pitot heat, consider this technique
http://aeroelectric.com/articles/wingwire/wingwire.html
or something similar.
Bob . . .
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