---------------------------------------------------------- AeroElectric-List Digest Archive --- Total Messages Posted Wed 10/11/17: 15 ---------------------------------------------------------- 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 _____________________________________ Time: 06:39:52 AM PST US From: "Michael Easley" Subject: AeroElectric-List: 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 _____________________________________ Time: 08:10:05 AM PST US From: "Robert L. Nuckolls, III" Subject: Re: AeroElectric-List: 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 _____________________________________ Time: 09:06:31 AM PST US Subject: AeroElectric-List: Constructing an automatic RCA video camera feed splitter From: "Airdog77" 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 _____________________________________ Time: 10:04:18 AM PST US From: "Robert L. Nuckolls, III" Subject: Re: AeroElectric-List: 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 . . . ________________________________ Message 5 _____________________________________ Time: 11:22:45 AM PST US From: "Robert L. Nuckolls, III" Subject: Re: AeroElectric-List: 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 _____________________________________ Time: 11:52:17 AM PST US From: Joel Ventura Subject: Re: AeroElectric-List: 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 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 _____________________________________ Time: 11:54:31 AM PST US From: "Robert L. Nuckolls, III" Subject: Re: AeroElectric-List: 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 _____________________________________ Time: 12:12:08 PM PST US Subject: Re: AeroElectric-List: Constructing an automatic RCA video camera feed splitter From: C&K 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 _____________________________________ Time: 02:28:48 PM PST US From: "Robert L. Nuckolls, III" Subject: Re: AeroElectric-List: 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 ____________________________________ Time: 03:33:40 PM PST US Subject: Re: AeroElectric-List: Constructing an automatic RCA video camera feed splitter From: Charlie England 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 --- This email has been checked for viruses by Avast antivirus software. https://www.avast.com/antivirus ________________________________ Message 11 ____________________________________ Time: 03:35:39 PM PST US Subject: Re: AeroElectric-List: Constructing an automatic RCA video camera feed splitter From: C&K 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 ____________________________________ Time: 04:07:32 PM PST US From: "Robert L. Nuckolls, III" Subject: Re: AeroElectric-List: 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 ____________________________________ Time: 04:10:49 PM PST US From: "Robert L. Nuckolls, III" Subject: Re: AeroElectric-List: 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 These appear to be capable video switches. We'd still need to integrate some form of sequential switching timer . . . Bob . . . ________________________________ Message 14 ____________________________________ Time: 04:49:14 PM PST US Subject: Re: AeroElectric-List: Constructing an automatic RCA video camera feed splitter From: Charlie England 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 > > > > 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. --- This email has been checked for viruses by Avast antivirus software. https://www.avast.com/antivirus ________________________________ Message 15 ____________________________________ Time: 05:04:44 PM PST US Subject: Re: AeroElectric-List: Constructing an automatic RCA video camera feed splitter From: chris smale 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 ------------------------------------------------------------------------------------- Other Matronics Email List Services ------------------------------------------------------------------------------------- Post A New Message aeroelectric-list@matronics.com UN/SUBSCRIBE http://www.matronics.com/subscription List FAQ http://www.matronics.com/FAQ/AeroElectric-List.htm Web Forum Interface To Lists http://forums.matronics.com Matronics List Wiki http://wiki.matronics.com Full Archive Search Engine http://www.matronics.com/search 7-Day List Browse http://www.matronics.com/browse/aeroelectric-list Browse Digests http://www.matronics.com/digest/aeroelectric-list Browse Other Lists http://www.matronics.com/browse Live Online Chat! http://www.matronics.com/chat Archive Downloading http://www.matronics.com/archives Photo Share http://www.matronics.com/photoshare Other Email Lists http://www.matronics.com/emaillists Contributions http://www.matronics.com/contribution ------------------------------------------------------------------------------------- These Email List Services are sponsored solely by Matronics and through the generous Contributions of its members.