Today's Message Index:
----------------------
1. 06:39 AM - Dual Power Inputs, Dual Buss Electrical System (Michael Easley)
2. 08:10 AM - Re: Dual Power Inputs, Dual Buss Electrical System (Robert L. Nuckolls, III)
3. 09:06 AM - Constructing an automatic RCA video camera feed splitter (Airdog77)
4. 10:04 AM - Re: Constructing an automatic RCA video camera feed splitter (Robert L. Nuckolls, III)
5. 11:22 AM - Re: Constructing an automatic RCA video camera feed splitter (Robert L. Nuckolls, III)
6. 11:52 AM - Re: Constructing an automatic RCA video camera feed splitter (Joel Ventura)
7. 11:54 AM - Re: Constructing an automatic RCA video camera feed splitter (Robert L. Nuckolls, III)
8. 12:12 PM - Re: Constructing an automatic RCA video camera feed splitter (C&K)
9. 02:28 PM - Re: Constructing an automatic RCA video camera feed splitter (Robert L. Nuckolls, III)
10. 03:33 PM - Re: Constructing an automatic RCA video camera feed splitter (Charlie England)
11. 03:35 PM - Re: Constructing an automatic RCA video camera feed splitter (C&K)
12. 04:07 PM - Re: Constructing an automatic RCA video camera feed splitter (Robert L. Nuckolls, III)
13. 04:10 PM - Re: Constructing an automatic RCA video camera feed splitter (Robert L. Nuckolls, III)
14. 04:49 PM - Re: Constructing an automatic RCA video camera feed splitter (Charlie England)
15. 05:04 PM - Re: Constructing an automatic RCA video camera feed splitter (chris smale)
Message 1
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| Subject: | Dual Power Inputs, Dual Buss Electrical System |
I'm redoing my panel in my aircraft which I built 15 years ago with a Z-14
electrical system. I'm installing a Garmin G3X panel and all the associated
boxes. Most of them have the capability to wire for 2 separate power
sources. With dual buss with crossfeed, I'm wondering if there is any
significant benefit to having two CBs and two power feeds. I can think of a
couple failure modes, but they seem remote. There is also a configuration
using a backup battery on the second power feed, maybe that's a better
choice. Thanks in advance for the feedback.
Message 2
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| Subject: | Re: Dual Power Inputs, Dual Buss Electrical System |
At 08:37 AM 10/11/2017, you wrote:
>I'm redoing my panel in my aircraft which I built 15 years ago with
>a Z-14 electrical system. I'm installing a Garmin G3X panel and all
>the associated boxes. Most of them have the capability to wire for
>2 separate power sources. With dual buss with crossfeed, I'm
>wondering if there is any significant benefit to having two CBs and
>two power feeds. I can think of a couple failure modes, but they
>seem remote. There is also a configuration using a backup battery
>on the second power feed, maybe that's a better choice. Thanks in
>advance for the feedback.
>
With two batteries, two alternators and crossfeed,
there is no value in exploiting the redundancy
features you cited. Z14 has all that stuff built
in.
Bob . . .
Message 3
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| Subject: | Constructing an automatic RCA video camera feed splitter |
Hi Bob, et al.
I recently purchased a GRT EFIS for the Long-EZ that I'm building. The GRT EFIS
has an option to connect up a single video feed to it via USB (in this case,
my 4-port USB hub). I've tested out some mini-video cameras I picked up off
of Amazon that are about the size of a dime, and the picture quality is great
for what I want to use them for.
As I'm sure many of you know, most canard aircraft have fuel site gages in the
back seat area. Look inside these birds parked on the ramp and invariable you'll
find a mirror, which is what canard pilots often use to check out their fuel
site gages in the back. I figured with such diminutive sizes on these cameras,
why not hook one up focused on each site gage, and while I'm at it point
a 3rd camera looking aft at the engine from atop the pilot head rest. A 4th camera
on the bottom CL looking aft would be round out my initial camera installation.
My issue is that I would like to have a timed cycle display of each of these camera
views in a little window on my EFIS (GRT has taken care of the EFIS display
part), say 3-5 seconds per camera. However, every RCA jack 4-into-1 video
channel selector I have found --while cheap-- are bulky plastic housing a large
mechanical switch to select the video channel.... mainly used by video gamers.
I talked with GRT and any machinations going on with the video feed is fine,
as long as only one physical RCA video jack is presented to their USB video
input device.
I would like to construct a 4x (or more) channel IN and 1x RCA jack channel out
device that is small, and automatically cycles through each camera view, again
for 3-5 seconds. Adjustable viewing times would be good, and maybe a manual
pause or cycle button would be good as well.
Does anybody know of a device like this that exists? Would the circuitry for something
like this be too complicated? Finally, is there any detriment to swapping
out the thicker RCA cabling with 24 AWG shielded wire?
Thanks!
Wade
--------
Airdog
Wade Parton
Building Long-EZ 916WP
www.longezpush.com
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=473469#473469
Message 4
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| Subject: | Re: Constructing an automatic RCA video camera feed |
splitter
My Byte Thrasher in Chief (Paul Fisher) helped me craft
a universal, 4 step timer chip described here:
http://tinyurl.com/y96wc8rh
I've used this chip on several applications and
it's easily adapted to your task. The link
above contains a description of the chip which
can be supplied you to at no cost with what
ever time intervals you wish programmed in.
Further, there is a hold function on the chip
that can be used to pause switching in the
current state.
Somewhere in the pile on my bench, I have some of the
development ecbs shown on the linked page.
You could assemble one with driver transistors
and build an array of relays to handle video
switching.
Alternatively, could cut-n-paste the ECB
artwork into a new board that would eliminate
the driver transistors and drive some really
small, surface mounted relays to handle
video switching.
http://tinyurl.com/ybhnq6m6
It wouldn't take much time to lay out the
board . . . but I'm up to my eyeballs right
now in projects that need to be cleared
off the bench. If anyone wants to take the
data posted and lay out a new board, I'd
be pleased to critique the work product before
boards are ordered.
Does anybody know of a device like this that exists? Would the
circuitry for something like this be too complicated? Finally, is
there any detriment to swapping out the thicker RCA cabling with 24
AWG shielded wire?
That would be fine too. There are ECB
mounted RCA jacks that could be incorporated
into your video switcher board.
Bob . . .
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| Subject: | Re: Constructing an automatic RCA video camera |
feed splitter
>
> Somewhere in the pile on my bench, I have some of the
> development ecbs shown on the linked page.
> You could assemble one with driver transistors
> and build an array of relays to handle video
> switching.
Found one . . .
Emacs!
Bob . . .
Message 6
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| Subject: | Re: Constructing an automatic RCA video camera feed |
splitter
What cameras are you using?
Thanks. --Joel
On Wed, Oct 11, 2017 at 12:05 PM, Airdog77 <Airdog77@gmail.com> wrote:
>
> Hi Bob, et al.
>
> I recently purchased a GRT EFIS for the Long-EZ that I'm building. The
> GRT EFIS has an option to connect up a single video feed to it via USB (in
> this case, my 4-port USB hub). I've tested out some mini-video cameras I
> picked up off of Amazon that are about the size of a dime, and the picture
> quality is great for what I want to use them for.
>
>
> Thanks!
> Wade
>
> --------
> Airdog
> Wade Parton
> Building Long-EZ 916WP
> www.longezpush.com
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=473469#473469
>
>
Message 7
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| Subject: | Re: Constructing an automatic RCA video camera |
feed splitter
> Somewhere in the pile on my bench, I have some of the
> development ecbs shown on the linked page.
> You could assemble one with driver transistors
> and build an array of relays to handle video
> switching.
Poked around a bit in the residual components
and assemblies from other tasks. Ran across this
4-relay assembly that already has driver couplers
and transistors. This board could be combined with
the timer board (sans drivers) to get you
75% of the way to video switching Nirvana . . .
Emacs!
You'd need to box the thing up with connectors
to mate with your external components. I'd probably
fabricate a box about 3.5 square by 1.0 thick with
a d-sub connector on it.
Bob . . .
Message 8
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| Subject: | Re: Constructing an automatic RCA video camera feed |
splitter
I'm curious why you'd consider driving relays instead of a 4 into 1
analog switching chip.
Ken
On 11/10/2017 2:22 PM, Robert L. Nuckolls, III wrote:
>>
>> Somewhere in the pile on my bench, I have some of the
>> development ecbs shown on the linked page.
>> You could assemble one with driver transistors
>> and build an array of relays to handle video
>> switching.
>
> Found one . . .
> Emacs!
>
>
> Bob . . .
>
Message 9
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| Subject: | Re: Constructing an automatic RCA video camera feed |
splitter
At 02:10 PM 10/11/2017, you wrote:
>
>I'm curious why you'd consider driving relays instead of a 4 into 1
>analog switching chip.
If I were laying out a board and doing it myself,
that's the first approach to be considered. Haven't
played video lately so I'm unsure what the constraints
might be for solid-state switching. Some applications
and switch choices called for +/- power supplies
which complicates the circuitry.
The next choice to consider would be taking the barefoot
chip and using digital outputs to drive low current
form A relays directly. This would let us craft the
1:4 sequential switcher with a grand total of 11
parts and no concerns for DC levels on the video
lines.
The approach being offered is the short-path, minimum
risk to success for a neophyte builder using junkbox
parts.
Bob . . .
Message 10
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| Subject: | Re: Constructing an automatic RCA video camera feed |
splitter
On 10/11/2017 11:05 AM, Airdog77 wrote:
>
> Hi Bob, et al.
>
> I recently purchased a GRT EFIS for the Long-EZ that I'm building. The GRT EFIS
has an option to connect up a single video feed to it via USB (in this case,
my 4-port USB hub). I've tested out some mini-video cameras I picked up off
of Amazon that are about the size of a dime, and the picture quality is great
for what I want to use them for.
>
> As I'm sure many of you know, most canard aircraft have fuel site gages in the
back seat area. Look inside these birds parked on the ramp and invariable you'll
find a mirror, which is what canard pilots often use to check out their
fuel site gages in the back. I figured with such diminutive sizes on these cameras,
why not hook one up focused on each site gage, and while I'm at it point
a 3rd camera looking aft at the engine from atop the pilot head rest. A 4th
camera on the bottom CL looking aft would be round out my initial camera installation.
>
> My issue is that I would like to have a timed cycle display of each of these
camera views in a little window on my EFIS (GRT has taken care of the EFIS display
part), say 3-5 seconds per camera. However, every RCA jack 4-into-1 video
channel selector I have found --while cheap-- are bulky plastic housing a large
mechanical switch to select the video channel.... mainly used by video gamers.
I talked with GRT and any machinations going on with the video feed is fine,
as long as only one physical RCA video jack is presented to their USB video
input device.
>
> I would like to construct a 4x (or more) channel IN and 1x RCA jack channel out
device that is small, and automatically cycles through each camera view, again
for 3-5 seconds. Adjustable viewing times would be good, and maybe a manual
pause or cycle button would be good as well.
>
> Does anybody know of a device like this that exists? Would the circuitry for
something like this be too complicated? Finally, is there any detriment to swapping
out the thicker RCA cabling with 24 AWG shielded wire?
>
> Thanks!
> Wade
>
> --------
> Airdog
> Wade Parton
> Building Long-EZ 916WP
> www.longezpush.com
>
There was an article on a diy 8 channel video/audio using a bank of
solid state switches about 30 years ago in, if memory serves, Byte
Magazine. Much easier to buy off the rack these days.
How about
http://www.ebay.com/itm/4-CH-Channel-DVR-CCTV-Quad-Video-Camera-Processor-System-Kit-Splitter-Switcher-/391156611012?epid=1839817989&hash=item5b12c037c4:g:Op4AAOxyuR5TbcoS
or
http://www.ebay.com/itm/4-Channel-Automatic-Video-Switcher-for-Automotive-Cars-/172847332805?hash=item283e80fdc5:g:UW8AAOSwmhJZqR5f
or, ask GRT why this won't work
http://www.ebay.com/itm/4-Channel-BNC-RCA-To-USB-Converter-DVR-Adapter-Camera-Video-Switcher-/191162842864?hash=item2c82317ef0:g:D3MAAOSwstxVJd7K
---
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Message 11
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| Subject: | Re: Constructing an automatic RCA video camera feed |
splitter
Thanks for the explanation.
I've never played with USB video but I think the D+ and D- USB signals
are both normally only positive with respect to the power ground and
that the signal information is differential between those pins. Makes me
wonder if dual pole relays would be needed.
Ken
On 11/10/2017 5:28 PM, Robert L. Nuckolls, III wrote:
> At 02:10 PM 10/11/2017, you wrote:
>>
>> I'm curious why you'd consider driving relays instead of a 4 into 1
>> analog switching chip.
>
> If I were laying out a board and doing it myself,
> that's the first approach to be considered. Haven't
> played video lately so I'm unsure what the constraints
> might be for solid-state switching. Some applications
> and switch choices called for +/- power supplies
> which complicates the circuitry.
>
> The next choice to consider would be taking the barefoot
> chip and using digital outputs to drive low current
> form A relays directly. This would let us craft the
> 1:4 sequential switcher with a grand total of 11
> parts and no concerns for DC levels on the video
> lines.
>
> The approach being offered is the short-path, minimum
> risk to success for a neophyte builder using junkbox
> parts.
>
>
> Bob . . .
>
Message 12
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| Subject: | Re: Constructing an automatic RCA video camera feed |
splitter
At 05:34 PM 10/11/2017, you wrote:
>
>Thanks for the explanation.
>I've never played with USB video but I think the D+ and D- USB
>signals are both normally only positive with respect to the power
>ground and that the signal information is differential between those
>pins. Makes me wonder if dual pole relays would be needed.
>Ken
I was driving off the original posting
that talked about RCA connectors which
I chased down the single-wire, analog
rabbit hole.
If were talking about USB digital data,
yeah, that's easily managed in the +5v
world . . .
Bob . . .
Message 13
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| Subject: | Re: Constructing an automatic RCA video camera feed |
splitter
>There was an article on a diy 8 channel video/audio using a bank of
>solid state switches about 30 years ago in, if memory serves, Byte
>Magazine. Much easier to buy off the rack these days.
>
>How about
<snip>
These appear to be capable video switches. We'd
still need to integrate some form of sequential switching
timer . . .
Bob . . .
Message 14
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| Subject: | Re: Constructing an automatic RCA video camera feed |
splitter
On 10/11/2017 6:10 PM, Robert L. Nuckolls, III wrote:
>> There was an article on a diy 8 channel video/audio using a bank of
>> solid state switches about 30 years ago in, if memory serves, Byte
>> Magazine. Much easier to buy off the rack these days.
>>
>> How about
>
> <snip>
>
> These appear to be capable video switches. We'd
> still need to integrate some form of sequential switching
> timer . . .
>
> Bob . . .
>
Don't remember if any of those links I sent include sequential
switching, but I saw at least one on ebay that did include that in its
functionality. Price point was in the same ~$50 range.
---
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| Subject: | Re: Constructing an automatic RCA video camera feed |
splitter
On 10/11/17 09:05, Airdog77 wrote:
>
> Hi Bob, et al.
>
> I recently purchased a GRT EFIS for the Long-EZ that I'm building. The GRT EFIS
has an option to connect up a single video feed to it via USB (in this case,
my 4-port USB hub). I've tested out some mini-video cameras I picked up off
of Amazon that are about the size of a dime, and the picture quality is great
for what I want to use them for.
>
> As I'm sure many of you know, most canard aircraft have fuel site gages in the
back seat area. Look inside these birds parked on the ramp and invariable you'll
find a mirror, which is what canard pilots often use to check out their
fuel site gages in the back. I figured with such diminutive sizes on these cameras,
why not hook one up focused on each site gage, and while I'm at it point
a 3rd camera looking aft at the engine from atop the pilot head rest. A 4th
camera on the bottom CL looking aft would be round out my initial camera installation.
>
> My issue is that I would like to have a timed cycle display of each of these
camera views in a little window on my EFIS (GRT has taken care of the EFIS display
part), say 3-5 seconds per camera. However, every RCA jack 4-into-1 video
channel selector I have found --while cheap-- are bulky plastic housing a large
mechanical switch to select the video channel.... mainly used by video gamers.
I talked with GRT and any machinations going on with the video feed is fine,
as long as only one physical RCA video jack is presented to their USB video
input device.
>
> I would like to construct a 4x (or more) channel IN and 1x RCA jack channel out
device that is small, and automatically cycles through each camera view, again
for 3-5 seconds. Adjustable viewing times would be good, and maybe a manual
pause or cycle button would be good as well.
>
> Does anybody know of a device like this that exists? Would the circuitry for
something like this be too complicated? Finally, is there any detriment to swapping
out the thicker RCA cabling with 24 AWG shielded wire?
>
> Thanks!
> Wade
>
> --------
> Airdog
> Wade Parton
> Building Long-EZ 916WP
> www.longezpush.com
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=473469#473469
>
>
If you have some computer skill or know someone who has, the raspberry
pi can do what you want.
csmale@bak.rr.com
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