---------------------------------------------------------- AeroElectric-List Digest Archive --- Total Messages Posted Fri 08/23/13: 2 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 02:09 PM - Re: Failed brownout battery experiment (Eric M. Jones) 2. 03:04 PM - Re: Failed brownout battery experiment (user9253) ________________________________ Message 1 _____________________________________ Time: 02:09:33 PM PST US Subject: AeroElectric-List: Re: Failed brownout battery experiment From: "Eric M. Jones" > Since the Dynon normally is powered through a separate terminal, I believe that DS-1 can be eliminated and DS-3 can be shorted. Since this circuit will only be needed for less than a second during engine start, does R1 need to have such a high wattage rating? > Joe Joe, I think DS1 and 3 are needed. Bob? Does R1 need to be 35W? This is a TO-220 resistor, so it's pretty small. When the circuit is first charged (or after sitting) the capacitor current is a dead short. So no, 35W is excessive, but it has to be high wattage. 1.4A x 1.4A x 10 W. You might get by with a lot smaller part. Make sure you note that Bob N. pointed out that the Supercaps needed to be pulse rated, so I've changed them. -------- 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=407385#407385 ________________________________ Message 2 _____________________________________ Time: 03:04:03 PM PST US Subject: AeroElectric-List: Re: Failed brownout battery experiment From: "user9253" Thanks Eric This circuit might have to be powered on when ever the D-180 is on (instead of through the start swtch) in order to give the capacitors time to charge. According to an online time constant calculator, it could take up to 2.5 seconds. http://easycalculation.com/engineering/electrical/capacitor-energy-rc-time-constant.php -------- Joe Gores Read this topic online here: http://forums.matronics.com/viewtopic.php?p=407391#407391 ------------------------------------------------------------------------------------- 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.