Today's Message Index:
----------------------
1. 07:33 AM - Re: Why CB on regulator field supply? (user9253)
2. 08:06 AM - Re: Wiring Best Practices? (An anecdotal follow-up) (user9253)
3. 08:27 AM - Re: Re: Wiring Best Practices? (An anecdotal follow-up) (Charlie England)
4. 09:39 AM - Re: Re: Wiring Best Practices? (An anecdotal follow-up) (Christopher Cee Stone)
5. 10:12 AM - SURFACE MOUNTED THROUGH HOLE COMPONENTS (user9253)
6. 10:40 AM - Re: Re: Wiring Best Practices? (An anecdotal follow-up) (David Carter)
7. 11:40 AM - Re: Wiring Best Practices? (allenmaris)
8. 01:10 PM - Re: Wiring Best Practices? (An anecdotal follow-up) (user9253)
9. 02:45 PM - Re: Re: Wiring Best Practices? (Robert L. Nuckolls, III)
10. 04:21 PM - Re: Re: Wiring Best Practices? (An anecdotal follow-up) (Sebastien)
11. 05:29 PM - Re: Re: Wiring Best Practices? (An anecdotal follow-up) (Stuart Hutchison)
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| Subject: | Re: Why CB on regulator field supply? |
> or from loose wire terminals that make heat . .
>
> (terminal on the breaker itself? probably
> not . . . you'd have to conduct a LOT of
> loose-joint, heat-energy into the breaker
> to trip it's bi-metal current sense mechanism)
I was speaking in general when I gave 3 causes for breakers tripping, not specifically
the alternator field circuit.
I worked in an industrial electrical setting. On more than one occasion I found
circuit breakers tripped due to heat caused by their screws being loose. Of
course those circuit were probably carrying 15 amps or more. The whole electrical
system in my RV-12 uses less than 15 amps. :-)
Speaking of loose screws, it seems that the vast majority of electrical problems
are caused by loose connections.
--------
Joe Gores
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=505855#505855
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| Subject: | Re: Wiring Best Practices? (An anecdotal follow-up) |
> Folks who pass along various and sundry admonitions
> for 'avoiding problems' are offering the ideas
> in good faith. But it can be difficult to separate ol'
> hangar tales and legends from good physics. There
> are plenty of talented engineers and technicians
> who are victims of poor advice propagated in the
> name of safety and good performance.
That makes me think of using red cockpit lights at night.
Every pilot knows that red light does not ruin night vision as much as white light,
right?
But is that really true? Are builders installing red lights for naught?
Is this another old wives tale that never dies?
Dim red lights are used in camera film dark rooms. So if red lights are good for
film, they must be good for our eyes too, or so the reasoning goes.
What are the physics?
--------
Joe Gores
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=505856#505856
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| Subject: | Re: Wiring Best Practices? (An anecdotal follow-up) |
On 1/31/2022 10:05 AM, user9253 wrote:
>
>
>> Folks who pass along various and sundry admonitions
>> for 'avoiding problems' are offering the ideas
>> in good faith. But it can be difficult to separate ol'
>> hangar tales and legends from good physics. There
>> are plenty of talented engineers and technicians
>> who are victims of poor advice propagated in the
>> name of safety and good performance.
> That makes me think of using red cockpit lights at night.
> Every pilot knows that red light does not ruin night vision as much as white
light, right?
> But is that really true? Are builders installing red lights for naught?
> Is this another old wives tale that never dies?
> Dim red lights are used in camera film dark rooms. So if red lights are good
for film, they must be good for our eyes too, or so the reasoning goes.
> What are the physics?
>
> --------
> Joe Gores
Here you go:
https://www.nps.gov/articles/dark-adaptation-of-the-human-eye-and-the-value-of-red-flashlights.htm
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| Subject: | Re: Wiring Best Practices? (An anecdotal follow-up) |
For very low levels of intensity (scotopic vision
<https://en.wikipedia.org/wiki/Scotopic_vision>), the sensitivity of the
eye is mediated by rods, not cones, and shifts toward the violet
<https://en.wikipedia.org/wiki/Violet_(color)>, peaking around 507 nm for
young eyes; the sensitivity is equivalent to 1699 lm/W[9]
<https://en.wikipedia.org/wiki/Luminous_efficiency_function#cite_note-Kohei2004-16>
or 1700 lm/W[10]
<https://en.wikipedia.org/wiki/Luminous_efficiency_function#cite_note-Casimer1998-17>
at
this peak. (wikipedia)
For low light illumination ideally we would illuminate with a source of 507
nm.
[image: image.png]
...Chris
On Mon, Jan 31, 2022 at 8:12 AM user9253 <fransew@gmail.com> wrote:
>
>
> > Folks who pass along various and sundry admonitions
> > for 'avoiding problems' are offering the ideas
> > in good faith. But it can be difficult to separate ol'
> > hangar tales and legends from good physics. There
> > are plenty of talented engineers and technicians
> > who are victims of poor advice propagated in the
> > name of safety and good performance.
>
> That makes me think of using red cockpit lights at night.
> Every pilot knows that red light does not ruin night vision as much as
> white light, right?
> But is that really true? Are builders installing red lights for naught?
> Is this another old wives tale that never dies?
> Dim red lights are used in camera film dark rooms. So if red lights are
> good for film, they must be good for our eyes too, or so the reasoning goes.
> What are the physics?
>
> --------
> Joe Gores
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=505856#505856
>
>
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| Subject: | SURFACE MOUNTED THROUGH HOLE COMPONENTS |
I made a circuit on perf board with all components and wires on the top surface
so that the perf board can be be fastened directly
to aluminum without shorting out. I glued the components to the board with E6000.
When completed, I coated everything with a layer of E6000. That keeps wires apart
that are not supposed to touch.
The value of R1 determines setpoint. You might want to use a POT. The light
comes on at about 13.2 volts.
Choose the value of the LED resistor based on the voltage drop of your LED.
I don't need this warning light because my EFIS warns if the voltage is low.
It was a fun winter project.
--------
Joe Gores
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=505861#505861
Attachments:
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| Subject: | Re: Wiring Best Practices? (An anecdotal follow-up) |
This older thread on VAF
https://vansairforce.net/community/showthread.php?t=64051&page=3 mentions
interesting findings from the Air Force Night Vision Research Lab.
Key points:
Cool White: White was preferred by 2 of the experts, the 3rd chose green
1st and white 2nd. Cool white encompasses the scotopic (night
vision)sensitivity peak of 507nm while providing the benefit of full color
readability on maps etc. The Air Force has established cool white as a
MILSPEC for ambient cockpit lighting due to emergency procedure concerns.
Dimmed down low everyone said that cool white would be fine for night
vision.
Green lights: Scotopic (night vision) is most sensitive to light of 507nm
wavelength which is an aqua green. This means that with green light you can
dim the lights to a greater degree while still perceiving objects.
Practically this means better night vision, maintaining pupil dilation and
reduced reflections in our cockpit.
Red/orange: The old red goggle adage has lost its fame. Yes red minimizes
the bleaching of rodopsin which is important for night vision. But Red
lighting is another matter because we lose red on charts etc. Green
minimizes rodopsin bleaching while maximizing sensitivity.
Blue: This was unanimously the worse color choice. Blue also messes with
reds/orange making them shades of grey. But Blues greatest detractor is
that as the shortest wavelength of visible light it is easiest to refract.
This means those with corneal scars from PRK/LASIK or scratches on glasses
will aggravate glare under blue light. This also means the possibility of
increased reflections as we need to have them turned up alittle higher than
the other colors or white.
Wavelength of 5050 LEDs by color:
Cool white ? 6,000k-7000k which encompasses all vivible spectrums
Blue ? 465-470nm
Red ? 625-630nm
Green ? 515-520nm
---
David Carter
david@carter.net
On Mon, Jan 31, 2022 at 12:40 PM Christopher Cee Stone <rv8iator@gmail.com>
wrote:
> For very low levels of intensity (scotopic vision
> <https://en.wikipedia.org/wiki/Scotopic_vision>), the sensitivity of the
> eye is mediated by rods, not cones, and shifts toward the violet
> <https://en.wikipedia.org/wiki/Violet_(color)>, peaking around 507 nm for
> young eyes; the sensitivity is equivalent to 1699 lm/W[9]
> <https://en.wikipedia.org/wiki/Luminous_efficiency_function#cite_note-Kohei2004-16>
> or 1700 lm/W[10]
> <https://en.wikipedia.org/wiki/Luminous_efficiency_function#cite_note-Casimer1998-17>
at
> this peak. (wikipedia)
>
> For low light illumination ideally we would illuminate with a source of
> 507 nm.
> [image: image.png]
> ...Chris
>
>
> On Mon, Jan 31, 2022 at 8:12 AM user9253 <fransew@gmail.com> wrote:
>
>>
>>
>> > Folks who pass along various and sundry admonitions
>> > for 'avoiding problems' are offering the ideas
>> > in good faith. But it can be difficult to separate ol'
>> > hangar tales and legends from good physics. There
>> > are plenty of talented engineers and technicians
>> > who are victims of poor advice propagated in the
>> > name of safety and good performance.
>>
>> That makes me think of using red cockpit lights at night.
>> Every pilot knows that red light does not ruin night vision as much as
>> white light, right?
>> But is that really true? Are builders installing red lights for naught?
>> Is this another old wives tale that never dies?
>> Dim red lights are used in camera film dark rooms. So if red lights are
>> good for film, they must be good for our eyes too, or so the reasoning goes.
>> What are the physics?
>>
>> --------
>> Joe Gores
>>
>>
>>
>>
>> Read this topic online here:
>>
>> http://forums.matronics.com/viewtopic.php?p=505856#505856
>>
>>
>>
>>
>>
>>
>> ==========
>> -
>> Electric-List" rel="noreferrer" target="_blank">
>> http://www.matronics.com/Navigator?AeroElectric-List
>> ==========
>> FORUMS -
>> eferrer" target="_blank">http://forums.matronics.com
>> ==========
>> WIKI -
>> errer" target="_blank">http://wiki.matronics.com
>> ==========
>> b Site -
>> -Matt Dralle, List Admin.
>> ="noreferrer" target="_blank">https://matronics.com/contribution
>> ==========
>>
>>
>>
>>
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| Subject: | Re: Wiring Best Practices? |
Thank you all for the input and the story, Bob. I am using best practices for shielding/grounds
to the best of the common theories that I've come across from
multiple sources. It was the best practices from one source but no mention from
another source that had me thrown. I'm feeling much more confident that I'll
probably be fine. And for sure, pushing the PTT button won't fire the ejector
seat.
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=505864#505864
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| Subject: | Re: Wiring Best Practices? (An anecdotal follow-up) |
The link in the above post takes one to the thread.
This link below takes you to the specific post about Air Force night lighting research:
https://vansairforce.net/community/showpost.php?p=479679&postcount=23
--------
Joe Gores
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=505865#505865
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| Subject: | Re: Wiring Best Practices? |
At 01:40 PM 1/31/2022, you wrote:
>
>Thank you all for the input and the story, Bob. I am using best
>practices for shielding/grounds to the best of the common theories
>that I've come across from multiple sources. It was the best
>practices from one source but no mention from another source that
>had me thrown. I'm feeling much more confident that I'll probably be
>fine. And for sure, pushing the PTT button won't fire the ejector seat.
>
>
About those shields . . . the most mis-understood feature
in systems interfacing: Follow them manufacturer's
recommendations when given in the installation manual.
SOMETIMES the shield is BOTH a mitigator of noise propagation
AND conductor of energy. I have purposely used shielded wire
as the power feeder for LED indicator lights meaning that
both center conductor and shield need to be 'powered'.
But shields in small signal and data systems are USUALLY
intended only to mitigate ELECTRO-STATICALLY coupling between
adjacent wires in a bundle. In these cases, no substantial
energy is conducted on the shield and only one end is
'grounded'. In rare cases, builders have mistakenly
deduced, 'if one ground is good, two grounds are better'
only to find that a new, magnetically coupled noise has
appeared in the victimized system due to ground loop
currents flowing on the shield.
Confucius says, "When in doubt, read the instructions.
If still in doubt, check it out on the AeroElectric-List."
Bob . . .
Un impeachable logic: George Carlin asked, "If black boxes
survive crashes, why don't they make the whole airplane
out of that stuff?"
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| Subject: | Re: Wiring Best Practices? (An anecdotal follow-up) |
It really depends on what you want to see. If you're dealing with paper
checklists and especially paper maps, you're far better off with white
since you'll need less light to see clearly. On the other hand if you are
using a tablet for mapping and an EFIS for flight and engine instruments,
then red light will be better for night vision while identifying switches,
finding lost pens, etc.
On our Super Rebel we went with white light under the lip of the dashboard
to provide flood lighting for reading maps and checklists and also
illuminate panel switches. Testing revealed that even at the dimmest
setting there was far more light than desirable. I didn't think it would be
a problem since we can just turn the lights off when not needed and turn
them on again when flipping switches but then I couldn't find the bloody
dimmer switch in the dark. Might place some glow in the dark tape or
something around that switch or reduce the number of lights.
Also do yourself a favour and place as bright a light as possible in the
baggage compartment for loading and unloading. Don't place it on the
battery bus.
On Mon, Jan 31, 2022 at 1:15 PM user9253 <fransew@gmail.com> wrote:
>
> The link in the above post takes one to the thread.
> This link below takes you to the specific post about Air Force night
> lighting research:
> https://vansairforce.net/community/showpost.php?p=479679&postcount=23
>
> --------
> Joe Gores
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=505865#505865
>
>
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| Subject: | Re: Wiring Best Practices? (An anecdotal follow-up) |
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