---------------------------------------------------------- AeroElectric-List Digest Archive --- Total Messages Posted Fri 08/29/08: 13 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 05:37 AM - Re: Electroair ignition (Chuck Jensen) 2. 05:42 AM - Re: Electroair ignition (Peter Laurence) 3. 06:37 AM - Re: Kitplanes article on an Elegant LED driver (David E. Nelson) 4. 07:11 AM - Re: Kitplanes article on an Elegant LED driver (Ernest Christley) 5. 07:19 AM - Re: Electroair ignition (Dave Leikam) 6. 08:05 AM - Avionics Back-Up Power (Carlos Trigo) 7. 08:26 AM - Re: Kitplanes article on an Elegant LED driver (Robert L. Nuckolls, III) 8. 08:28 AM - Re: Avionics Back-Up Power (Robert L. Nuckolls, III) 9. 08:38 AM - Re: Kitplanes article on an Elegant LED driver (David E. Nelson) 10. 09:18 AM - Re: Avionics Back-Up Power (Carlos Trigo) 11. 10:39 AM - Re: Kitplanes article on an Elegant LED driver (Ernest Christley) 12. 12:34 PM - 430W to Analog autopilot (sam@fr8dog.net) 13. 01:22 PM - Re: 430W to Analog autopilot (Bill Denton) ________________________________ Message 1 _____________________________________ Time: 05:37:15 AM PST US Subject: RE: AeroElectric-List: Electroair ignition From: "Chuck Jensen" Experience in, like how to troubleshoot and adjust, or in, like has anyone flown them. I can only help on the latter. About 700 hours with Electroair on one side, mag on the other on a Velocity XLRG. I woudn't know much about troubleshooting/repairing....never had to. Chuck Jensen -----Original Message----- From: owner-aeroelectric-list-server@matronics.com [mailto:owner-aeroelectric-list-server@matronics.com]On Behalf Of Dave Leikam Sent: Friday, August 29, 2008 12:09 AM Subject: AeroElectric-List: Electroair ignition Does anyone have experience with Electroair ignitions? Compared to Lightspeed? Dave Leikam RV-10 #40496 N89DA (Reserved) Muskego, WI Canopy trimming ________________________________ Message 2 _____________________________________ Time: 05:42:22 AM PST US From: "Peter Laurence" Subject: RE: AeroElectric-List: Electroair ignition Yes Peter _____ From: owner-aeroelectric-list-server@matronics.com [mailto:owner-aeroelectric-list-server@matronics.com] On Behalf Of Dave Leikam Sent: Friday, August 29, 2008 12:09 AM Subject: AeroElectric-List: Electroair ignition Does anyone have experience with Electroair ignitions? Compared to Lightspeed? Dave Leikam RV-10 #40496 N89DA (Reserved) Muskego, WI Canopy trimming ________________________________ Message 3 _____________________________________ Time: 06:37:00 AM PST US From: "David E. Nelson" Subject: Re: AeroElectric-List: Kitplanes article on an Elegant LED driver Hi Bob, I'm curious, why is such a high freq (1-2MHz) needed for an application such as this? Rather, why not in high 100's of Hz given that the eye can't even discern above 30 Hz? Thank you, /\/elson ~~ Lately my memory seems to be like a steel trap .... without any spring. ~~ On Thu, 28 Aug 2008, Robert L. Nuckolls, III wrote: > > http://www.national.com/ds/LM/LM3404.pdf > > This is one of a host of similar one to multi-channel dimmer > controllers. The 3404 delivers up to of constant current > to it's companion loads. > > It's a switcher. It hums at 1 to 2 Mhz with a butt-ugly > wave-form rich in harmonics. This device needs to be > a very compact layout (small antenna aperture) and be fitted > with conduction filters on the input/output wires. It > MIGHT be okay in a plastic enclosure . . . but a metal > one never hurts. > ________________________________ Message 4 _____________________________________ Time: 07:11:46 AM PST US From: Ernest Christley Subject: Re: AeroElectric-List: Kitplanes article on an Elegant LED driver David E. Nelson wrote: > > > > Hi Bob, > > I'm curious, why is such a high freq (1-2MHz) needed for an > application such as this? Rather, why not in high 100's of Hz given > that the eye can't even discern above 30 Hz? > 100's of Hz will put you in the audio range and possibly give a humm in the audio portions of the airplane. Somewhere just above 30KHz would seem like the best frequency range. ________________________________ Message 5 _____________________________________ Time: 07:19:36 AM PST US From: "Dave Leikam" Subject: Re: AeroElectric-List: Electroair ignition Would you be willing to elaborate? If so, please do. Thanks. Dave Leikam RV-10 #40496 N89DA (Reserved) Muskego, WI ----- Original Message ----- From: Peter Laurence To: aeroelectric-list@matronics.com Sent: Friday, August 29, 2008 7:41 AM Subject: RE: AeroElectric-List: Electroair ignition Yes Peter ------------------------------------------------------------------------- ----- From: owner-aeroelectric-list-server@matronics.com [mailto:owner-aeroelectric-list-server@matronics.com] On Behalf Of Dave Leikam Sent: Friday, August 29, 2008 12:09 AM To: aeroelectric-list@matronics.com; RV-10 matronics Subject: AeroElectric-List: Electroair ignition Does anyone have experience with Electroair ignitions? Compared to Lightspeed? Dave Leikam RV-10 #40496 N89DA (Reserved) Muskego, WI Canopy trimming http://www.matronics.com/contribution ________________________________ Message 6 _____________________________________ Time: 08:05:31 AM PST US From: "Carlos Trigo" Subject: AeroElectric-List: Avionics Back-Up Power Bob and the group Since I had to put some weight in the tail of my RV-9A, I decided to install a battery as back-up power to some avionics, the EFIS, the COMM Radio and the Transponder. My GRT EFIS has 2 power inputs, which are internally controlled (EFIS uses the electrons from the highest source), so this is easy to wire. However, the Radio (SL-30) and the Transponder (GTX-330) only have 1 power input, therefore the question: - How should I wire power, both from Main Battery and Back-Up Battery, to the COMM Radio and the Transponder? Help appreciated Carlos ________________________________ Message 7 _____________________________________ Time: 08:26:56 AM PST US From: "Robert L. Nuckolls, III" Subject: Re: AeroElectric-List: Kitplanes article on an Elegant LED driver At 08:31 AM 8/29/2008 -0500, you wrote: > > > >Hi Bob, > >I'm curious, why is such a high freq (1-2MHz) needed for an application >such as this? Rather, why not in high 100's of Hz given that the eye >can't even discern above 30 Hz? > >Thank you, > > /\/elson Great question. The problem of selecting an operating frequency comes from a trade-off in reactances . . . in the form of inductors and capacitors. The higher you go in frequency, the more energy can be stored on a given size inductor (assuming the core is loss less). The higher you go in frequency, the easier it is to couple energy via capacitors . . . both for the purpose of bypassing and transfer. In this case, the power supply is an energy conversion system that stores a short pulse of current on and inductor and then retrieves that energy at a different voltage level. Given no other considerations for efficiency of the switching devices and losses in the magnetics, one would LIKE to operate at the highest possible frequency to drive down the physical size of components. Example. Step down transformers for 60 Hz AC delivered to the house can handle about 60 watts per pound of transformer core and copper. Airplanes use 400 Hz and the same transformer weight and volume can handle over 6 times the power . . . but the iron for the transformer must be tailored for low losses at the higher frequency. The high output LEDs need about 4v per lamp (whites) but they're CURRENT driven devices. The really cool thing about switchmode power supplies is that you can take energy in at voltages in a much below or above the desired output levels and bring the energy out as either a constant current or constant votlage. The LM3404 is designed to operate in the constant-current mode. Batteries are not constant voltage devices . . . so the most efficient flashlights will have a rather sophisticated voltage to constant current generator that accepts battery voltage over the full range useful output and delivers a constant current to the lamp until the batteries are truly drained. These converters need to be tiny and efficient . . . highest practical operating frequency is a strong consideration in meeting design goals. Bob . . . ________________________________ Message 8 _____________________________________ Time: 08:28:48 AM PST US From: "Robert L. Nuckolls, III" Subject: Re: AeroElectric-List: Avionics Back-Up Power At 04:04 PM 8/29/2008 +0100, you wrote: >Bob and the group > > >Since I had to put some weight in the tail of my RV-9A, I decided to >install a battery as back-up power to some avionics, the EFIS, the COMM >Radio and the Transponder. > > >My GRT EFIS has 2 power inputs, which are internally controlled (EFIS uses >the electrons from the highest source), so this is easy to wire. > >However, the Radio (SL-30) and the Transponder (GTX-330) only have 1 power >input, therefore the question: > > > - How should I wire power, both from Main Battery and Back-Up Battery, > to the COMM Radio and the Transponder? How big a battery is it? How many batteries does the airplane carry already . . . in other words do you already have an AUX battery? Bob . . . ----------------------------------------) ( . . . a long habit of not thinking ) ( a thing wrong, gives it a superficial ) ( appearance of being right . . . ) ( ) ( -Thomas Paine 1776- ) ---------------------------------------- ________________________________ Message 9 _____________________________________ Time: 08:38:25 AM PST US From: "David E. Nelson" Subject: Re: AeroElectric-List: Kitplanes article on an Elegant LED driver Hi Ernest, Ok, 30KHz makes sense. Although 30Hz may not be within the dynamic range of the audio equipment, I could definately see a square wave's odd harmonics (90 Hz and 150 Hz, etc IIRC) reaching up into a sensitive audio area. Interesting. So now, why the MHz freq the LM3404? Thank you, /\/elson ~~ Lately my memory seems to be like a steel trap .... without any spring. ~~ On Fri, 29 Aug 2008, Ernest Christley wrote: > > > David E. Nelson wrote: >> >> >> >> Hi Bob, >> >> I'm curious, why is such a high freq (1-2MHz) needed for an application >> such as this? Rather, why not in high 100's of Hz given that the eye can't >> even discern above 30 Hz? >> > 100's of Hz will put you in the audio range and possibly give a humm in the > audio portions of the airplane. Somewhere just above 30KHz would seem like > the best frequency range. > > ________________________________ Message 10 ____________________________________ Time: 09:18:14 AM PST US From: "Carlos Trigo" Subject: RE: AeroElectric-List: Avionics Back-Up Power > > > >Since I had to put some weight in the tail of my RV-9A, I decided to > >install a battery as back-up power to some avionics, the EFIS, the COMM > >Radio and the Transponder. > > > > > >My GRT EFIS has 2 power inputs, which are internally controlled (EFIS uses > >the electrons from the highest source), so this is easy to wire. > > > >However, the Radio (SL-30) and the Transponder (GTX-330) only have 1 power > >input, therefore the question: > > > > > > - How should I wire power, both from Main Battery and Back-Up Battery, > > to the COMM Radio and the Transponder? > > How big a battery is it? How many batteries does the airplane > carry already . . . in other words do you already have an > AUX battery? > > Bob . . . I don't know exactly, because I still don't know the exact weight I need for W & B, but I am planning for a battery around 10Ah I do have 2 other batteries, Main and AUX, since my engine is an electron-dependant Subaru. Carlos ________________________________ Message 11 ____________________________________ Time: 10:39:46 AM PST US From: Ernest Christley Subject: Re: AeroElectric-List: Kitplanes article on an Elegant LED driver David E. Nelson wrote: > > So now, why the MHz freq the LM3404? I think Bob answered that well. Switching power supplies have an easier time of it at higher frequencies. The power supply in the back of your computer converts the 60Hz line signal up to something like 10KHz (IIRC) for the same reason. It is much easier to transform and then rectify a higher frequency signal to a clean output. The components can be much smaller and there is less heat generated. ________________________________ Message 12 ____________________________________ Time: 12:34:53 PM PST US From: "sam@fr8dog.net" Subject: AeroElectric-List: 430W to Analog autopilot Does anybody know if there is a way to connect a Garmin 430W to a Piper IIIB analog autopilot?Maybe where I can find information? ________________________________ Message 13 ____________________________________ Time: 01:22:28 PM PST US From: "Bill Denton" Subject: RE: AeroElectric-List: 430W to Analog autopilot You might try: http://www.centuryflight.com/index.html I think they made the autopilot... Thanks! Bill Denton bdenton@bdenton.com -----Original Message----- From: owner-aeroelectric-list-server@matronics.com [mailto:owner-aeroelectric-list-server@matronics.com] On Behalf Of sam@fr8dog.net Sent: Friday, August 29, 2008 3:31 PM Subject: AeroElectric-List: 430W to Analog autopilot Does anybody know if there is a way to connect a Garmin 430W to a Piper IIIB analog autopilot?Maybe where I can find information? ------------------------------------------------------------------------------------- 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.