---------------------------------------------------------- AeroElectric-List Digest Archive --- Total Messages Posted Mon 10/30/17: 12 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 07:54 AM - Re: Alt. drop out while pulling Gs... (Steve Stearns) 2. 08:54 AM - Re: Alt. drop out while pulling Gs... (user9253) 3. 10:19 AM - Re: Alt. drop out while pulling Gs... (Robert L. Nuckolls, III) 4. 12:45 PM - Re: Alt. drop out while pulling Gs... (Earl Schroeder) 5. 12:46 PM - Re: Re: Rotax/Ducati Voltage Regulator/Rectifier (Graeme Hart) 6. 01:20 PM - Re: Re: Rotax/Ducati Voltage Regulator/Rectifier (Ken Ryan) 7. 01:35 PM - Re: Re: Rotax/Ducati Voltage Regulator/Rectifier (Graeme Hart) 8. 02:03 PM - homebrew alternative to Ducati, etc regulators?? (Charlie England) 9. 04:04 PM - Re: Re: Constructing an automatic RCA video camera feed splitter (Richard Girard) 10. 05:07 PM - Re: Constructing an automatic RCA video camera feed splitter (Eric Page) 11. 08:00 PM - Re: homebrew alternative to Ducati, etc regulators?? (C&K) 12. 09:39 PM - Re: homebrew alternative to Ducati, etc regulators?? (Richard Girard) ________________________________ Message 1 _____________________________________ Time: 07:54:01 AM PST US From: Steve Stearns Subject: Re: AeroElectric-List: Alt. drop out while pulling Gs... >>Of course I'll be double checking connections >>etc. but I'm wondering if it's possible that the >>ford-style regulator I installed could be G >>sensitive? I can't image it but thought I would ask... >No, but alternator brushes are. They are held >against a slip ring with springs that don't >want to be too aggressive . . . they're relatively >soft carbon on soft copper. >If you could monitor output voltage from the >regulator's field terminal... Didn't expect that... This sounds like a good excuse for me to buy an inexpensive stand-alone multi-channel data logger. I assumed there would be many to choose from but a quick look on Amazon didn't turn one up. Anyone have any recommendations? Thanks, Steve Stearns Longeze N45FC Boulder/Longmont CO ________________________________ Message 2 _____________________________________ Time: 08:54:38 AM PST US Subject: AeroElectric-List: Re: Alt. drop out while pulling Gs... From: "user9253" This sounds like a good excuse to buy an EFIS with a data logger feature built in. :-) -------- Joe Gores Read this topic online here: http://forums.matronics.com/viewtopic.php?p=473970#473970 ________________________________ Message 3 _____________________________________ Time: 10:19:09 AM PST US From: "Robert L. Nuckolls, III" Subject: Re: AeroElectric-List: Alt. drop out while pulling Gs... >=C2 >No, but alternator brushes are. They are held >=C2 >against a slip ring with springs that don't >=C2 >want to be too aggressive . . . they're relatively >=C2 >soft carbon on soft copper. > >=C2 >If you could monitor output voltage from the >=C2 >regulator's field terminal... > >Didn't expect that...=C2 This sounds like a good >excuse for me to buy an inexpensive stand-alone >multi-channel data logger.=C2 I assumed there >would be many to choose from but a quick look on Amazon didn't turn one up. > >Anyone have any recommendations? Lots of products for monitoring temperature and shipping shocks . . . I've not seen any that would be very useful to the work we do. That's what prompted this project a couple of years ago now 99% ready for beta testing. Hmmmm . . . Paul and I are putting the final touches on the OBAM aircraft friendly data logger I mentioned a few days ago. Maybe you could be the 'beta test' project. Emacs! Emacs! Here's what the proof of concept assembly looks like. A very rudimentary configuration would suffice to get a look-see on significant parameters of your difficulty. I am going to install one on my pickup truck and just leave it in place to gather a constellation of data . . . but no reason we couldn't use it to get a peek at your airplane. Bob . . . ________________________________ Message 4 _____________________________________ Time: 12:45:09 PM PST US Subject: Re: AeroElectric-List: Alt. drop out while pulling Gs... From: Earl Schroeder I would like to have a couple of stand alone data loggers. Do not need anot her =98display=99 or have room for one. Earl > On Oct 30, 2017, at 12:17 PM, Robert L. Nuckolls, III wrote: > >> =C3=82 >No, but alternator brushes are. They are held >> =C3=82 >against a slip ring with springs that don't >> =C3=82 >want to be too aggressive . . . they're relatively >> =C3=82 >soft carbon on soft copper. >> >> =C3=82 >If you could monitor output voltage from the >> =C3=82 >regulator's field terminal... >> >> Didn't expect that...=C3=82 This sounds like a good excuse for me to buy an inexpensive stand-alone multi-channel data logger.=C3=82 I assumed ther e would be many to choose from but a quick look on Amazon didn't turn one up .. >> >> Anyone have any recommendations? > > Lots of products for monitoring temperature > and shipping shocks . . . I've not seen any > that would be very useful to the work we do. > > That's what prompted this project a couple > of years ago now 99% ready for beta testing. > > Hmmmm . . . Paul and I are putting the final > touches on the OBAM aircraft friendly data > logger I mentioned a few days ago. Maybe > you could be the 'beta test' project. > > <329c07f5.jpg> > > <329c0834.jpg> > > Here's what the proof of concept assembly > looks like. A very rudimentary configuration > would suffice to get a look-see on significant > parameters of your difficulty. > > I am going to install one on my pickup truck > and just leave it in place to gather a constellation > of data . . . but no reason we couldn't use > it to get a peek at your airplane. > > > Bob . . . ________________________________ Message 5 _____________________________________ Time: 12:46:00 PM PST US From: Graeme Hart Subject: Re: AeroElectric-List: Re: Rotax/Ducati Voltage Regulator/Rectifier I was able to order a regulator from Silent Hektik around this time last year. I had it shipped to a UK based re-shipping service that I used to get the regulator to NZ as Silent Hektik don't appear to ship outside of EU. There was a delay of about a month as they were on holiday but their website told me this before I placed the order. On Mon, Oct 30, 2017 at 5:27 AM, kenryan wrote: > > Thanks. I will probably sand the rough casting smooth and flat (at the > mounting ears) and use the paste. I've got some temp monitoring strips so > I'll determine how hot things get and then make a decision on dedicated > cooling air. I will only be using under 5 amps under normal circumstances > so I'm hoping the thing lasts. > > Sidenote: I have a German friend who is an avid aviation enthusiast and > the last time he went over there he tried to get me a Silent-Hektik > regulator. Unfortunately the company was non-responsive to his telephone > calls. They never answered their phone nor returned his messages. > > > Read this topic online here: > > http://forums.matronics.com/viewtopic.php?p=473933#473933 > > ________________________________ Message 6 _____________________________________ Time: 01:20:10 PM PST US From: Ken Ryan Subject: Re: AeroElectric-List: Re: Rotax/Ducati Voltage Regulator/Rectifier Great info Graeme. Do you have a link to the re-shipping service? On Mon, Oct 30, 2017 at 11:44 AM, Graeme Hart wrote: > I was able to order a regulator from Silent Hektik around this time last > year. I had it shipped to a UK based re-shipping service that I used to > get the regulator to NZ as Silent Hektik don't appear to ship outside of EU. > > There was a delay of about a month as they were on holiday but their > website told me this before I placed the order. > > On Mon, Oct 30, 2017 at 5:27 AM, kenryan wrote: > >> > >> >> Thanks. I will probably sand the rough casting smooth and flat (at the >> mounting ears) and use the paste. I've got some temp monitoring strips so >> I'll determine how hot things get and then make a decision on dedicated >> cooling air. I will only be using under 5 amps under normal circumstances >> so I'm hoping the thing lasts. >> >> Sidenote: I have a German friend who is an avid aviation enthusiast and >> the last time he went over there he tried to get me a Silent-Hektik >> regulator. Unfortunately the company was non-responsive to his telephone >> calls. They never answered their phone nor returned his messages. >> >> >> >> >> Read this topic online here: >> >> http://forums.matronics.com/viewtopic.php?p=473933#473933 >> >> >> >> >> >> >> =================================== >> - >> 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. >> rel="noreferrer" target="_blank">http://www.matronics.com/contribution >> =================================== >> >> >> >> > ________________________________ Message 7 _____________________________________ Time: 01:35:48 PM PST US From: Graeme Hart Subject: Re: AeroElectric-List: Re: Rotax/Ducati Voltage Regulator/Rectifier It was Youshop which is a NZ only service so unlikely to be of use to you. Others may be able to recommend a service that ships to your location. On Tue, 31 Oct 2017, 09:29 Ken Ryan wrote: > Great info Graeme. Do you have a link to the re-shipping service? > > On Mon, Oct 30, 2017 at 11:44 AM, Graeme Hart > wrote: > >> I was able to order a regulator from Silent Hektik around this time last >> year. I had it shipped to a UK based re-shipping service that I used to >> get the regulator to NZ as Silent Hektik don't appear to ship outside of EU. >> >> There was a delay of about a month as they were on holiday but their >> website told me this before I placed the order. >> > >> ________________________________ Message 8 _____________________________________ Time: 02:03:41 PM PST US From: Charlie England Subject: AeroElectric-List: homebrew alternative to Ducati, etc regulators?? With all the regulator failures on Rotax (insert version here) regulators, I've been wondering about whether the job could be accomplished using a different tack. What about a diode bridge using diodes that can handle the higher frequencies being generated by the 'wild' output from PM dynamos, followed by a 'buck' style switching regulator that could withstand the fairly high DC voltage that would result from high rpm and low load. Both the diode bridge and the 'switcher' might well be off-the-shelf items, that could be wired together to get a very high efficiency DC output. If I've been correctly interpreting some of the data on the traditional regulators, their efficiency is atrocious (which probably helps explain the horrible failure rate). A bit of filtering might be required to clean up the switcher's noise, but the idea seems worth exploring. If I had a dog in the hunt, I'd certainly take a shot at something like that. Charlie --- This email has been checked for viruses by Avast antivirus software. https://www.avast.com/antivirus ________________________________ Message 9 _____________________________________ Time: 04:04:18 PM PST US From: Richard Girard Subject: Re: AeroElectric-List: Re: Constructing an automatic RCA video camera feed splitter If I understand this project, it's just switching between cameras that are making a continual feed. How much more difficult would it be to not only switch between cameras but turn the camera off and on, too? I found this little guy at Gearbest (although it was only $33.41 when I bought it just last month): https://www.gearbest.com/fpv-system/pp_219405.html Amazing little camera that has a socket for a micro SD of up to 32 Gb. Even with that much storage it's only good for about 120 minutes of 1080P video. It seems like a lot until you consider how much is wasted in taxi and transit to the area where you want to film. As my trike is slow (42 mph cruise) that can amount to a quarter to half of the storage gone before I get to where I want to actually start recording. If the price comes back down again I'd like to have one on each wingtip, another on a boom from the nose, and a fourth on a drogue ( https://www.youtube.com/watch?v=_9hX5qY_ nO8 ) I've been using GoPro clones but being able to turn the HD19 on and off as I want would be much better. Rick Girard On Sun, Oct 29, 2017 at 10:16 PM, Alec Myers wrote: > > I didn=99t get a schematic attached. > > But - if you have a PIC, isn=99t it a better idea to get the PIC to do the > POR? Even if we can=99t contrive a way to spare a pin with an 8 pin PIC ou > could go back to the 14 pin PIC at no extra cost, and have plenty of IO > pins, comparators etc. No extra cost and you save the POR IC. > > > On Oct 29, 2017, at 11:10 PM, Eric Page wrote: > > > > alec(at)alecmyers.com wrote: > > 201 instructions, now, and still 9 bytes of data. So you saved 19 > instructions by changing IC. > > > > I=C3=A2=82=AC=84=A2ve run it through PICSIM as best I can; hardwa re would be the next > step. Unfortunately I don=C3=A2=82=AC=84=A2t have any trash PCBs fo r 8-pin PICs. > > > Beauty! > > I've got the schematic (PDF attached) and a fist pass at the board layout > complete. > > I exchanged a few questions/answers with a TI engineer about using the > CD74HC4051E, and he told me the main "gotcha" with the part is applying a > signal to an input before the IC is powered up. Apparently there's a pat h > from the inputs to Vdd until the internal FETs are properly biased. To > eliminate this possibility, I added a small circuit (bottom right corner of > the schematic) consisting of a power-on reset (POR) IC and a couple of > MOSFETs. The POR watches the +5V rail, and as soon as 1V is reached it > begins to hold Q1 off, thus allowing Q2 to be held off by R2. Once the + 5V > rail reaches 4.85V and a 150mS delay elapses, the reset signal is release d, > Q1 turns on, turning on Q2 and allowing bus power to reach the cameras. If > the +5V rail falls below 4.85V, the cameras are immediately shut off. > Assuming the cameras consume ~100mA each, it should be no problem to powe r > eight of them through a single D-Sub pin. > > The PCB is designed to fit between the two rows of solder cups on a DB-25 > connector and be soldered in place. Q2 will probably have to have its le gs > bent so it lays back, over the BAT46 diode. > > I'd say we're about done for now. Once we see how Wade's RCA-to-USB > converter and EFIS handle being switched between camera feeds, and Bob > checks the camera output signal, we'll know if any changes are necessary or > if we can go ahead with a hardware prototype. > > Eric > > > Top side of PCB: > > > Bottom side of PCB: > > > Read this topic online here: > > http://forums.matronics.com/viewtopic.php?p=473955#473955 > > > Attachments: > > http://forums.matronics.com//files/8_ch_vid_cam_mux_rev_c_213.pdf > > =========== =========== =========== =========== =========== > > -- =9CBlessed are the cracked, for they shall let in the light.=9D Groucho Marx ________________________________ Message 10 ____________________________________ Time: 05:07:12 PM PST US Subject: AeroElectric-List: Re: Constructing an automatic RCA video camera feed splitter From: "Eric Page" rickofudall wrote: > If I understand this project, it's just switching between cameras that are making a continual feed. Correct. > How much more difficult would it be to not only switch between cameras but turn the camera off and on, too? In principle, trivial, but it would certainly complicate the design of what we're doing in response to Wade's request. What exactly is it that you want to accomplish? I presume that on a trike you're not feeding your cameras into an EFIS display, but rather letting them record to memory, then editing the recorded video later. Do you want to be able to power the cameras ON/OFF remotely to save battery charge AND be able to toggle recording, or is it OK to have the cameras ON for the whole flight, and just be able to remotely toggle recording when desired? Without opening one of those cameras it's hard to know for sure, but judging by the buttons on them, it looks like you should be able to wire an additional switch parallel to the RECORD button and place it in a convenient location. If you want to control four cameras, a small board (1" x 2-1/2" should do) with four tactile switches could be mounted wherever you like and wired to the cameras. You could open each camera and install a pigtail from the RECORD switch to a two-pin connector outside the camera body, then route a wire pair with matching connector to the switch panel. Unless I've misunderstood what you want, I don't think any electronics would be required. Eric Read this topic online here: http://forums.matronics.com/viewtopic.php?p=473987#473987 ________________________________ Message 11 ____________________________________ Time: 08:00:49 PM PST US Subject: Re: AeroElectric-List: homebrew alternative to Ducati, etc regulators?? From: C&K Charlie, I agree that 80 watts dissipation while outputting 240 watts of power is not impressive. I suspect it is tough to do a lot better on a 12volt system though. 20 amps through any full wave silicon bridge arrangement is perhaps 30 watts lost and I'd guess at least another 20 watts from the buck converter inductor, mosfet(s), and diode. Such a commercially built converter would be larger and more expensive compared to existing after market offerings. Advantages should include a couple more amps of output and a I think a generally cooler running stator. I cobbled together a 50khz dc/dc buck converter for a 120 volt solar array for perhaps $30. of parts so a homebrew should be doable if one really wanted to. The output from my unit is electrically fairly noisy. Ken On 30/10/2017 5:06 PM, Charlie England wrote: > > > With all the regulator failures on Rotax (insert version here) > regulators, I've been wondering about whether the job could be > accomplished using a different tack. > > What about a diode bridge using diodes that can handle the higher > frequencies being generated by the 'wild' output from PM dynamos, > followed by a 'buck' style switching regulator that could withstand > the fairly high DC voltage that would result from high rpm and low > load. Both the diode bridge and the 'switcher' might well be > off-the-shelf items, that could be wired together to get a very high > efficiency DC output. If I've been correctly interpreting some of the > data on the traditional regulators, their efficiency is atrocious > (which probably helps explain the horrible failure rate). A bit of > filtering might be required to clean up the switcher's noise, but the > idea seems worth exploring. If I had a dog in the hunt, I'd certainly > take a shot at something like that. > > Charlie > > --- > This email has been checked for viruses by Avast antivirus software. > https://www.avast.com/antivirus > > ________________________________ Message 12 ____________________________________ Time: 09:39:48 PM PST US From: Richard Girard Subject: Re: AeroElectric-List: homebrew alternative to Ducati, etc regulators?? There are lots of dynamos on lots of motorcycle engines, tractors and industrial engines. Surely there must be an RR out there from the likes of John Deere, Kubota, or Harley Davidson. If not there then the aftermarket has units from Accel, Custom Chrome, JP Cycles or Dennis Kirk just to name a few. As an aside, the first thing you learn when you work on Rotax engines is that the first place to look when there's a problem is how the owner deviated from the engine's Installation Manual. Just sayin' Rick Girard On Mon, Oct 30, 2017 at 9:58 PM, C&K wrote: > > Charlie, I agree that 80 watts dissipation while outputting 240 watts of > power is not impressive. I suspect it is tough to do a lot better on a > 12volt system though. 20 amps through any full wave silicon bridge > arrangement is perhaps 30 watts lost and I'd guess at least another 20 > watts from the buck converter inductor, mosfet(s), and diode. Such a > commercially built converter would be larger and more expensive compared to > existing after market offerings. Advantages should include a couple more > amps of output and a I think a generally cooler running stator. > > I cobbled together a 50khz dc/dc buck converter for a 120 volt solar arra y > for perhaps $30. of parts so a homebrew should be doable if one really > wanted to. The output from my unit is electrically fairly noisy. > > Ken > > > On 30/10/2017 5:06 PM, Charlie England wrote: > >> ceengland7@gmail.com> >> >> With all the regulator failures on Rotax (insert version here) >> regulators, I've been wondering about whether the job could be accomplis hed >> using a different tack. >> >> What about a diode bridge using diodes that can handle the higher >> frequencies being generated by the 'wild' output from PM dynamos, follow ed >> by a 'buck' style switching regulator that could withstand the fairly hi gh >> DC voltage that would result from high rpm and low load. Both the diode >> bridge and the 'switcher' might well be off-the-shelf items, that could be >> wired together to get a very high efficiency DC output. If I've been >> correctly interpreting some of the data on the traditional regulators, >> their efficiency is atrocious (which probably helps explain the horrible >> failure rate). A bit of filtering might be required to clean up the >> switcher's noise, but the idea seems worth exploring. If I had a dog in the >> hunt, I'd certainly take a shot at something like that. >> >> Charlie >> >> --- >> This email has been checked for viruses by Avast antivirus software. >> https://www.avast.com/antivirus >> >> >> >> >> >> =========== =========== =========== =========== =========== > > -- =9CBlessed are the cracked, for they shall let in the light.=9D Groucho Marx ------------------------------------------------------------------------------------- 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.