---------------------------------------------------------- AeroElectric-List Digest Archive --- Total Messages Posted Tue 07/31/12: 4 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 05:06 AM - What guage wire for alternator to bus bar (kmiller) 2. 07:01 AM - Re: Using LEDs in Series (Eric M. Jones) 3. 10:31 AM - Re: Using LEDs in Series (dfritzj) 4. 10:31 AM - Ipad for glass cockpit display (Eric M. Jones) ________________________________ Message 1 _____________________________________ Time: 05:06:05 AM PST US Subject: AeroElectric-List: What guage wire for alternator to bus bar From: "kmiller" sorry ( i am a newbie to this forum ) if this is already answered else where, but i would like to know the minimum gauge wire i should use for a 60amp alternator (15V) to the Bus bar which is 5ft away. In normal operation max current draw in flight would be 12 amps ( landing lights , nav lights, radio, transponder, solenoids) In addition, (and this may seem like a silly idea), but I actually want to limit the maximum current that could go into my lithium Ion Phosphate battery immediately after start up to say 10 amps, how would I go about this ? Currently it is drawing max amps out of the alternator for the rotation speed (1200 rpm) for a few minutes, and I think this was the reason for my alternator drive coupling slipping. Keith -------- KIS owner Read this topic online here: http://forums.matronics.com/viewtopic.php?p=379681#379681 ________________________________ Message 2 _____________________________________ Time: 07:01:34 AM PST US Subject: AeroElectric-List: Re: Using LEDs in Series From: "Eric M. Jones" > ... For a switching regulator (digital) that is "noise free with really good design," you say that it involves knowing what frequency spectrum you can use for switching ... something that won't interfere. As diverse as our airplanes are, with several systems and with ubiquitous installation techniques and paths, how does one design a noise free switching regulator? The only way I can think of is to design it with passive filtering and packaging methods such that radiated and conducted EMI is reduced to something extremely low. This would also involve extensive testing to verify the low EMI. That kind of design and testing would cost a pretty peso. > > Seems to me the safest way to go is an active linear regulator with a sufficient back plate to dissipate the heat. Henador Titzoff Henador, Yes, yes and yes. But this is drifting off the AeroElectric List interest level, so let's not post here. I carefully removed the potting from the Buck-Puck that Bob N. designed the filter for and discovered that it was (IMHO) a very poor design. It could have been much quieter with 1) A clock line that didn't wander around the board like a drunken sailor and 2) a four-layer board which would have cost a dime more. Several of the semiconductor companies (like National and TI) have design programs where you just punch in the parameters and they give you a well-designed PCB and parts list. Also Vicor, Astrodyne and other higher-end companies have good switcher designs that are used in aircraft all the time. I once had a 175W switcher design tested by an RFI/EMI lab and the test guy said he thought his equipment had broken because he couldn't tell if the unit was ON or OFF by looking at his spectrum analyzer. High praise indeed! It was remarkable, quite simple and used virtually no line filtering. The designer was brilliant...but he said he didn't really like designing power supplies and went to work for a specialty custom IC house. do not archive -------- Eric M. Jones www.PerihelionDesign.com 113 Brentwood Drive Southbridge, MA 01550 (508) 764-2072 emjones(at)charter.net Read this topic online here: http://forums.matronics.com/viewtopic.php?p=379690#379690 ________________________________ Message 3 _____________________________________ Time: 10:31:35 AM PST US Subject: Re: AeroElectric-List: Using LEDs in Series From: dfritzj Thanks for the in-depth answer, Eric. It sounds like I should stick to a more classic approach. I didn't like the idea of a whole set of lights going out for one failure anyway (too many bad Christmas-tree memories...) Dan ________________________________ Message 4 _____________________________________ Time: 10:31:35 AM PST US Subject: AeroElectric-List: Ipad for glass cockpit display From: "Eric M. Jones" Not a heads up display but remarkable. Prices are going down... http://preview.tinyurl.com/cgz9t2r do not archive -------- Eric M. Jones www.PerihelionDesign.com 113 Brentwood Drive Southbridge, MA 01550 (508) 764-2072 emjones(at)charter.net Read this topic online here: http://forums.matronics.com/viewtopic.php?p=379711#379711 ------------------------------------------------------------------------------------- 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.