---------------------------------------------------------- AeroElectric-List Digest Archive --- Total Messages Posted Thu 07/05/07: 9 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 06:47 AM - Re: Re: Automatic Headlight Hi/Lo Fallover Circuit (Robert L. Nuckolls, III) 2. 12:59 PM - Re: Re: Automatic Headlight Hi/Lo Fallover Circuit (Carlos Trigo) 3. 02:12 PM - Re: Dynon Compass mounting (Vernon Smith) 4. 03:28 PM - Clarification between: main/essential/battery bus? (mikef) 5. 04:13 PM - Re: Clarification between: main/essential/battery bus? (Matt Prather) 6. 04:16 PM - Re: Dynon Compass mounting (Jim Jewell) 7. 04:44 PM - Re: Re: Automatic Headlight Hi/Lo Fallover Circuit (Ralph Hoover) 8. 05:43 PM - Re: Dynon Compass mounting (Emrath) 9. 10:13 PM - Re: Attitude gyro problem. (Nick1) ________________________________ Message 1 _____________________________________ Time: 06:47:39 AM PST US From: "Robert L. Nuckolls, III" Subject: Re: AeroElectric-List: Re: Automatic Headlight Hi/Lo Fallover Circuit At 08:30 PM 7/4/2007 -0400, you wrote: > >Several turns of heavy magnet wire ~18 ga wound the length of a magnetic >reed switch in place of the .01 ohm resistor and you could bias the FET on >when the current flow stops. A similar idea is used to drive the bulb >failure indicator on some cars (Volvo, uses a Bosch module) It turns on a >warning bulb not an FET but the idea is there. Not sure what you're referring to here . . . perhaps your message was truncated? I considered a variety of current sensing techniques for the article but settled on the reed switch as the simplest and most likely to be successfully assembled by a neophyte. The last few circuits I designed that included a non-contact, current sense feature used hall devices from Amploc. See: http://amploc.com/HANDBOOK%204.pdf I use these critters a lot when I need to grab a medium quality current value from a wire in an airplane where I need to avoid cutting into it for a shunt. Bob . . . ________________________________ Message 2 _____________________________________ Time: 12:59:50 PM PST US From: "Carlos Trigo" Subject: Re: AeroElectric-List: Re: Automatic Headlight Hi/Lo Fallover Circuit > I considered a variety of current sensing techniques for > the article but settled on the reed switch as the simplest > and most likely to be successfully assembled by a neophyte. > The last few circuits I designed that included a non-contact, > current sense feature used hall devices from Amploc. See: > > http://amploc.com/HANDBOOK%204.pdf > > I use these critters a lot when I need to grab a > medium quality current value from a wire in an airplane > where I need to avoid cutting into it for a shunt. > > Bob . . . Bob And with this critters as current sensors, which is the dedicated digital indicator we can use in our aircraft's instrument panel ? Carlos ________________________________ Message 3 _____________________________________ Time: 02:12:34 PM PST US From: Vernon Smith Subject: RE: AeroElectric-List: Dynon Compass mounting Thanks for asking the question and the answers. I was running into the same dilemma. Dan's solution is much easier than mine. Vern Smith do not archive From: N81JG@aol.comDate: Thu, 5 Jul 2007 01:43:56 -0400Subject: Re: AeroEle ctric-List: Dynon Compass mountingTo: aeroelectric-list@matronics.com www.rvproject.com Many photos of the magnetometer installation of Dan Chec koway in his construction log. John See what's free at AOL.com. _________________________________________________________________ PC Magazine=92s 2007 editors=92 choice for best web mail=97award-winning Wi ndows Live Hotmail. ration_HMWL_mini_pcmag_0707 ________________________________ Message 4 _____________________________________ Time: 03:28:00 PM PST US Subject: AeroElectric-List: Clarification between: main/essential/battery bus? From: "mikef" Hi, I'm a new aircraft owner and am considering reworking the electrical system, and my av electric knowledge is rudimentary. I am having a hard time understanding the difference between the main, essential, and battery bus. I've have, and have read the AeroConnection and the figure 17-3 is what I think I'd like to get to given my aircraft and flying type. I guess I am mostly confused over what is essential vs battery bus. I would think anything categorized as essential would need to be on the battery bus too. Thanks for any clarification, Mike Read this topic online here: http://forums.matronics.com/viewtopic.php?p=122419#122419 ________________________________ Message 5 _____________________________________ Time: 04:13:47 PM PST US Subject: Re: AeroElectric-List: Clarification between: main/essential/battery bus? From: "Matt Prather" It's been a while since I've thought about this, but here are a couple of items: - The "essential bus" has been renamed to "endurance bus" to make the name more accurately reflect the purpose - namely to efficiently provide power to the items that you need in order to comfortably complete a flight after the failure of the primary electrical energy source (alternator). Switching the main bus off and leaving the endurance bus on offers a single switch method of load shedding.. - The battery bus should power the items that are needed to keep the engine running while the rest of the electrical system is de-energized. If your engine has EFI or electronic ignition, it should probably powered from the battery bus. Additionally, certain accessories might be powered from the battery bus - maybe a cabin courtesy/panel light. Nav/comm/txp equipment shouldn't be on the battery bus - not required for keeping the engine running. An EFI fuel pump shouldn't be on the endurance bus.. Regards, Matt- > > Hi, > > I'm a new aircraft owner and am considering reworking the electrical > system, and my av electric knowledge is rudimentary. I am having a hard > time understanding the difference between the main, essential, and battery > bus. I've have, and have read the AeroConnection and the figure 17-3 is > what I think I'd like to get to given my aircraft and flying type. > > I guess I am mostly confused over what is essential vs battery bus. I > would think anything categorized as essential would need to be on the > battery bus too. > > Thanks for any clarification, > > Mike > > > Read this topic online here: > > http://forums.matronics.com/viewtopic.php?p=122419#122419 > > ________________________________ Message 6 _____________________________________ Time: 04:16:36 PM PST US From: "Jim Jewell" Subject: Re: AeroElectric-List: Dynon Compass mounting My solution was to mount the Dynon D10-A magnetometer well forward on the horizontal stab deck below the vertical stab. After 30 hours of flight it works there with good accuracy. No magnetic deflection from the chrome molly steel elevator horns or rudder cables some 18 to 20 inches away. The temperature sensor is mounted on the fuse right hand side in the shade under the horizontal stab. Jim in Kelowna ----- Original Message ----- From: Vernon Smith To: aeroelectric-list@matronics.com Sent: Thursday, July 05, 2007 2:07 PM Subject: RE: AeroElectric-List: Dynon Compass mounting Thanks for asking the question and the answers. I was running into the same dilemma. Dan's solution is much easier than mine. Vern Smith do not archive ------------------------------------------------------------------------- --- From: N81JG@aol.com Date: Thu, 5 Jul 2007 01:43:56 -0400 Subject: Re: AeroElectric-List: Dynon Compass mounting To: aeroelectric-list@matronics.com www.rvproject.com Many photos of the magnetometer installation of Dan Checkoway in his construction log. John ------------------------------------------------------------------------- --- See what's free at AOL.com. ist" target=_blank>http://www.matronics.com/Navigator?AeroElectric-List p://forums.matronics.com ------------------------------------------------------------------------- ----- PC Magazine=92s 2007 editors=92 choice for best web mail=97award-winning Windows Live Hotmail. Check it out! ________________________________ Message 7 _____________________________________ Time: 04:44:59 PM PST US From: Ralph Hoover Subject: Re: AeroElectric-List: Re: Automatic Headlight Hi/Lo Fallover Circuit Bob, Sorry I wasn't clear. The magnetic current sense element as described could be applied to the circuit described by Eric and thus eliminating the gain block and the series resistor required to develop the I/R drop that is the input to the gain block. Just after sending my previous post I saw your sensor circuit post. So my concept was to utilize the reed switch to turn on the FET just as you suggest turning on the LED indicator. The Volvo/Bosch module is interesting in that it uses a bifilar winding with current from one bulb going one way and current from the other in a pair (say front and rear right turn signal). If both bulbs are burning the fields cancel and no warning. This eliminates the problem of triggering a warning if the lights are turned off or flashing. The only state that will switch the module is unbalanced current in the 2 coils as in only one bulb lighted. Ralph Hoover RV7A Robert L. Nuckolls, III wrote: > > > At 08:30 PM 7/4/2007 -0400, you wrote: > >> >> >> Several turns of heavy magnet wire ~18 ga wound the length of a >> magnetic reed switch in place of the .01 ohm resistor and you could >> bias the FET on when the current flow stops. A similar idea is used >> to drive the bulb failure indicator on some cars (Volvo, uses a Bosch >> module) It turns on a warning bulb not an FET but the idea is there. > > Not sure what you're referring to here . . . perhaps your > message was truncated? > > I considered a variety of current sensing techniques for > the article but settled on the reed switch as the simplest > and most likely to be successfully assembled by a neophyte. > The last few circuits I designed that included a non-contact, > current sense feature used hall devices from Amploc. See: > > http://amploc.com/HANDBOOK%204.pdf > > I use these critters a lot when I need to grab a > medium quality current value from a wire in an airplane > where I need to avoid cutting into it for a shunt. > > Bob . . . > > -- Ralph C. Hoover RV7A hooverra at verizon dot net ________________________________ Message 8 _____________________________________ Time: 05:43:00 PM PST US From: "Emrath" Subject: AeroElectric-List: RE: Dynon Compass mounting Thanks to everyone for their comments and thoughts. I forget to check Dan's site first. While not exactly what I'd seen, that has started my o'grey matter to think of what to do. The tail cone seems like a neat idea unless you even need to service it. Then I'll need a "baggage compartment monkey" to get back there and fix it, not to be confused with a "trunk monkey". Marty -----Original Message----- From: Emrath [mailto:emrath@comcast.net] Sent: Wednesday, July 04, 2007 9:51 AM Subject: Dynon Compass mounting I have seen some pictures of the EDC-10 compass mounting in a side by side RV behind the baggage compartment near the top of the fuselage but I have lost the reference for these pictures. I would like to review how this was accompished to be able to replicate in my ship flattering the inventor of this install method. Does anyone have pictures of their installation of the compass module behind the baggage compartment bulkhead that they can share with me? Marty in Brentwood TN RV-6A panel wiring and sanding fiberglass. ________________________________ Message 9 _____________________________________ Time: 10:13:04 PM PST US Subject: AeroElectric-List: Re: Attitude gyro problem. From: "Nick1" Greg, Just curious what was the problem? Do you need any more suggestions? Nick Read this topic online here: http://forums.matronics.com/viewtopic.php?p=122481#122481 ------------------------------------------------------------------------------------- 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.