---------------------------------------------------------- AeroElectric-List Digest Archive --- Total Messages Posted Thu 02/17/11: 11 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 05:58 AM - Re: cell phone rechargers (John Morgensen) 2. 06:10 AM - Wiring diagram question for Pitot Heat On indicator light (plevyakh) 3. 06:46 AM - 9005 LVWABM (dj45) 4. 07:32 AM - Re: 9005 LVWABM (Robert L. Nuckolls, III) 5. 07:32 AM - Re: Wiring diagram question for Pitot Heat On indicator light (Robert L. Nuckolls, III) 6. 07:40 AM - Re: follow up shielded wire/hub question (Robert L. Nuckolls, III) 7. 07:58 AM - Re: Wiring diagram question for Pitot Heat On indicator light (plevyakh) 8. 08:04 AM - Re: Wiring diagram question for Pitot Heat On indicator light (plevyakh) 9. 08:13 AM - Re: Re: AOA indicator (rayj) 10. 10:56 AM - Re: Re: Wiring diagram question for Pitot Heat On indicator light (Robert L. Nuckolls, III) 11. 07:39 PM - "Starter Engaged" Warning Light Circuit Refresher (Bob Falstad) ________________________________ Message 1 _____________________________________ Time: 05:58:41 AM PST US From: John Morgensen Subject: Re: AeroElectric-List: cell phone rechargers Bob Noffs, I would be very interested in duplicating your set-up. You said the LIGHT from the phone activated the contact? John Morgensen On 2/16/2011 5:38 PM, bob noffs wrote: > hi all, > with my $10 tracfone came a car recharger so i am all set. have a > garden tractor battery i bought for a trail cam and never used and at > least 1/2 dz. battery tenders around . i put a contacter together > today in a metal box with 120 volt plug and receptacle so handling a > 15 amp load is no problem. > i was still a little worried about something triggering the device [ > although not so much now as a power outage wont be a factor] and it > would run something for a week or two. this morning it came to me to > plug a timer in the power supply cord and interrupt the power to the > circuit board every 8 hrs or so. board will shut off if on and will > resume operation if it gets the light signals. > including the tracfone i have $40 in this and it works like a > million bucks! > thanks for the input. bob noffs > On Wed, Feb 16, 2011 at 10:17 AM, Carlos Trigo > wrote: ________________________________ Message 2 _____________________________________ Time: 06:10:27 AM PST US Subject: AeroElectric-List: Wiring diagram question for Pitot Heat On indicator light From: "plevyakh" Guys, I'm using Bob's pitot heat.pdf schematic as the base for a "Pitot Heat ON" amber LED light on my annunicator / warning light panel. http://www.aeroelectric.com/PPS/DeIce/Pitot_Heat.pdf In comparing this schematic to his article titled "Failure Detection and Annunciation I notice a few differences in the two schematics. http://www.aeroelectric.com/articles/Failure_Detection_and_Annunciation.pdf Questions: 1. In pitot_heat.pdf the relay is positioned just before the Pitot heater load and after the Reed switch sensor, vs in the second article the relay is positioned BEFORE the Reed switch sensor. Does it matter? 2. The Reed switch current sensor wire layout is different in the two articles. For example, the LED light wire is after the resistor in one, -vs- the LED wire is after the Radio Shack 275-232 reed relay in the second article. Does it matter? 3. Does anyone have a picture to share on how they boxed up and made flight worthy the Reed Switch Current Sensor? Thanks for any help here, Howard -------- Howard Plevyak GlaStar / North Bend, Ohio hplevyak@mac.com Read this topic online here: http://forums.matronics.com/viewtopic.php?p=331328#331328 Attachments: http://forums.matronics.com//files/pitot_heat_202.pdf http://forums.matronics.com//files/failure_detection_and_annunciation_134.pdf ________________________________ Message 3 _____________________________________ Time: 06:46:31 AM PST US Subject: AeroElectric-List: 9005 LVWABM From: "dj45" Hi Bob, Let me start with the warning that I am dumber than a box of rocks when it comes to electron herding. I just received the circuit bd. 9005-301-10. while placing the parts I find no holes for the IN4742A Optional diode. I assume that this is needed for the battery management function. I sure could use some direction on this before I solder things up. Thank you Dan Stanton -------- Do not archive Dan Stanton N9801S 99.9% Done and Flying N226BS 99.9% done Read this topic online here: http://forums.matronics.com/viewtopic.php?p=331329#331329 ________________________________ Message 4 _____________________________________ Time: 07:32:30 AM PST US From: "Robert L. Nuckolls, III" Subject: Re: AeroElectric-List: 9005 LVWABM At 09:43 AM 2/17/2011, you wrote: > >Hi Bob, >Let me start with the warning that I am dumber than a box of rocks >when it comes to electron herding. >I just received the circuit bd. 9005-301-10. while placing the parts >I find no holes for the IN4742A Optional diode. I assume that this >is needed for the battery management function. That part was deleted as not necessary . . . Bob . . . ________________________________ Message 5 _____________________________________ Time: 07:32:33 AM PST US From: "Robert L. Nuckolls, III" Subject: Re: AeroElectric-List: Wiring diagram question for Pitot Heat On indicator light At 09:07 AM 2/17/2011, you wrote: Guys, I'm using Bob's pitot heat.pdf schematic as the base for a "Pitot Heat ON" amber LED light on my annunicator / warning light panel. http://www.aeroelectric.com/PPS/DeIce/Pitot_Heat.pdf In comparing this schematic to his article titled "Failure Detection and Annunciation I notice a few differences in the two schematics. http://www.aeroelectric.com/articles/Failure_Detection_and_Annunciation.pdf Questions: 1. In pitot_heat.pdf the relay is positioned just before the Pitot heater load and after the Reed switch sensor, vs in the second article the relay is positioned BEFORE the Reed switch sensor. Does it matter? No 2. The Reed switch current sensor wire layout is different in the two articles. For example, the LED light wire is after the resistor in one, -vs- the LED wire is after the Radio Shack 275-232 reed relay in the second article. Does it matter? Depends on what you want to display. Light ON = "Pitot heat powered up and drawing current" (Page 3) Light ON = "Pitot heat powered but NOT drawing current". (Page 4) Bob . . . ________________________________ Message 6 _____________________________________ Time: 07:40:36 AM PST US From: "Robert L. Nuckolls, III" Subject: Re: AeroElectric-List: follow up shielded wire/hub question At 01:50 PM 2/16/2011, you wrote: >My first question needed to be more specific. My audio panel >installation manual shows that the shielded wires are "open" (shield >not grounded) at the end where the wires connect to the radio, and >the shields are all grounded together at the audio panel. > >If I use a "hub" system, where all avionics go in and then out of >the hub, do I keep each shield on a separate pin going in and out of >the hub, or do I ground all the shields together going into the hub >and then start a set of new shielded wires comng out of he hub (open >coming out of the hub) and tie all the shields to ground at the audio panel? Exactly where shields go to ground in small airplanes is pretty much irrelevant. IF the shield is connected at both ends and is obviously a return path for signal or power, then carry it through the hub on it's own pathway. If the shield is not a signal/power pathway, connect to common ground in hub (which still needs to be carried to shield ground at the audio panel) FYI . . . when replying to a message lumped with others in the 'digest' configuration, please trim away all non-relevant text from the message. Bob . . . ________________________________ Message 7 _____________________________________ Time: 07:58:54 AM PST US Subject: AeroElectric-List: Re: Wiring diagram question for Pitot Heat On indicator light From: "plevyakh" Thanks Bob...that helps. Can you comment on use of the 18AWG fuselink in the Pitot Heat.pdf schematic in place of a 15amp fuse? Why wouldn't I just use a 15amp fuse at the bus to protect my wire? Thanks, Howard -------- Howard Plevyak GlaStar / North Bend, Ohio hplevyak@mac.com Read this topic online here: http://forums.matronics.com/viewtopic.php?p=331341#331341 ________________________________ Message 8 _____________________________________ Time: 08:04:59 AM PST US Subject: AeroElectric-List: Re: Wiring diagram question for Pitot Heat On indicator light From: "plevyakh" Thanks Bob...that helps. Can you comment on use of the 18AWG fuselink in the Pitot Heat.pdf schematic in place of a 15amp fuse? Why wouldn't I just use a 15amp fuse at the bus to protect my wire? Thanks, Howard -------- Howard Plevyak GlaStar / North Bend, Ohio hplevyak@mac.com Read this topic online here: http://forums.matronics.com/viewtopic.php?p=331342#331342 ________________________________ Message 9 _____________________________________ Time: 08:13:39 AM PST US From: rayj Subject: Re: AeroElectric-List: Re: AOA indicator do not archive Thanks! Raymond Julian Kettle River, MN On 02/16/2011 07:09 PM, Robert L. Nuckolls, III wrote: > > > At 05:23 PM 2/16/2011, you wrote: >> >> Are they online somewhere? Or am I looking in the wrong place? > > I've posted them here. > > http://www.aeroelectric.com/articles/Angle_of_Attack/ > > > Bob . . . > > ________________________________ Message 10 ____________________________________ Time: 10:56:02 AM PST US From: "Robert L. Nuckolls, III" Subject: Re: AeroElectric-List: Re: Wiring diagram question for Pitot Heat On indicator light At 10:59 AM 2/17/2011, you wrote: > >Thanks Bob...that helps. > >Can you comment on use of the 18AWG fuselink in the Pitot Heat.pdf >schematic in place of a 15amp fuse? > >Why wouldn't I just use a 15amp fuse at the bus to protect my wire? The cold resistance of a heated pitot tube is about 1/2 that of the warmed up condition. Here's some data I gathered on a 28v tube. Cut the resistance values by about 1/2 for a 14v tube. [] Further, from the time power is first applied until the tube reaches operating temperature can be 20-60 seconds depending on environmental conditions. A 100w tube will nominally draw 7A at 14v, a 150w tube will be 11A. Inrush during warm up can by 2x those values. The duration of that inrush is protracted compared to a motor or incandescent lamp. Hence the suggestion for a 'robust' circuit protection. You can put in larger fuses too. Suggest 30A for fuse. A 15A circuit breaker would probably stay in . . . but be prepared to upsize if you get nuisance trips. Bob . . . ________________________________ Message 11 ____________________________________ Time: 07:39:59 PM PST US From: Bob Falstad Subject: AeroElectric-List: "Starter Engaged" Warning Light Circuit Refresher Bob N., I'm putting a "starter engaged" warning light in my new IFR panel. I simply hooked the incandescent bulb from my B&C alternator "low voltage" warning light between a fused wire that runs from the hot side of the starter contactor and ground. (I now have the standby B&C alternator and will use its controller's "standby alternator on" light in lieu of the low voltage light on the primary alternator controller.) But then I ran across a handwritten sketch that I believe you drew up for this circuit. It has a 470 Ohm - 1 Watt resistor in the wire between the hot side of the starter contactor and the lamp. It also shows a 1N4001 protection diode in parallel with the lamp and ground. It isn't clear from your sketch (and my electrical symbols knowledge is limited) whether the lamp is incandescent or an LED. If incandescent, is the protection diode required? Recommended? If incandescent, is the resistor required? Recommended? If the lamp is an LED, same questions. I can modify the circuit pretty easily right now but I'm towards the end of running all my wires in the plane and will be finishing all the harnesses soon. Thanks, as always, and Best regards, Bob Falstad GlaStar N248BF ------------------------------------------------------------------------------------- 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.