---------------------------------------------------------- AeroElectric-List Digest Archive --- Total Messages Posted Wed 12/29/21: 4 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 02:26 AM - Re: Re: Low voltage warning light (Peter Pengilly) 2. 03:53 AM - Re: Re: Low voltage warning light (bob noffs) 3. 06:50 AM - Re: Re: Low voltage warning light (Charles Davis) 4. 08:45 AM - Re: Low voltage warning light (user9253) ________________________________ Message 1 _____________________________________ Time: 02:26:37 AM PST US From: "Peter Pengilly" Subject: RE: AeroElectric-List: Re: Low voltage warning light In theory all that is needed is something like a TLV431 Zener, 2 or 3 resistors and a flashing 12V LED. Wouldn=92t need a PCB, so Veroboard would suffice. The values of the resistors is key to the voltage set point (and so 2 or 3 in series are probably required). I have no idea of the temperature stability. Small flashing 12v LEDs are available, but a 10mm item would be desirable. So a flashing circuit would be desirable, using something like a 555IC, meaning more components, complexity and testing. Perhaps an LM311 comparator would make a better a better job of monitoring the voltage as Bob has used. But when something that will just about do the job is available for =A311 it is hardly worth breaking out the soldering iron. I have learnt a lot about what is available, and what is not. Seems that the component cost is greater than the commercially available product, even though the commercial item doesn=92t do exactly I would like. Probably better to spend the time on other aspects of the overall aeroplane project. Peter From: owner-aeroelectric-list-server@matronics.com On Behalf Of Jared Yates Sent: 28 December 2021 12:32 Subject: Re: AeroElectric-List: Re: Low voltage warning light All it would take is someone ordering a batch of printed circuit boards, right? On December 28, 2021 06:09:44 "John M Tipton" > wrote: > So: what we all want it seems, is for 'Bob' to reintroduce his AEC9005 Series Low Voltage Warning mudules Read this topic online here: http://forums.matronics.com/viewtopic.php?p=505497#505497 ================ c-List Email Forum - n, FAQ, roElectric-List ================ MATRONICS WEB FORUMS - s! ================ EW MATRONICS LIST WIKI - v> ================ ntribution Web Site - bsp; -Matt Dralle, List Admin. iv> ================ ________________________________ Message 2 _____________________________________ Time: 03:53:19 AM PST US From: bob noffs Subject: Re: AeroElectric-List: Re: Low voltage warning light the problem with some low voltage monitors in the past was they let you use up a lot of lipo reserve power as they were set too low.you are right, you should be alerted as soon as alternator goes off line. On Tue, Dec 28, 2021 at 4:14 PM Charlie England wrote: > On 12/28/2021 2:58 PM, bob noffs wrote: > > fwiw i tried a circuit board, under the guidance of an elect. wizard i > also built a board from scratch and in the end i ordered the light from > perihelion .this is in the last couple of years. i talked to eric[owner] > and he can design it for any voltage. and his worked, at a > consistent voltage.lot different voltage for lead acid compared to lipo. > > On Tue, Dec 28, 2021 at 6:36 AM Jared Yates wrote: > >> All it would take is someone ordering a batch of printed circuit boards, >> right? >> >> On December 28, 2021 06:09:44 "John M Tipton" >> wrote: >> >>> johntiptonuk@hotmail.com> >>> >>> So: what we all want it seems, is for 'Bob' to reintroduce his >>> AEC9005 Series Low Voltage Warning mudules >>> >> If we're using the LV warning to alert for alternator failure, I'd think > the setpoint wouldn't change; the alternator is going to operate at a bit > north of 14V regardless of battery chemistry. Once I know I've lost the > alternator and know I'm operating on battery power (electrically dependent > engine), I want to be finding the ground ASAP, and can monitor battery > voltage with the voltmeter. Same should apply if in IMC with an > all-electric panel, though urgency might be a *little* lower if battery > consumption is lower. > > > Virus-free. > www.avast.com > > <#m_5199142161192957910_DAB4FAD8-2DD7-40BB-A1B8-4E2AA1F9FDF2> > ________________________________ Message 3 _____________________________________ Time: 06:50:51 AM PST US Subject: Re: AeroElectric-List: Re: Low voltage warning light From: Charles Davis Would a Hall-effect current transducer not be a solution ... configured to keep an LED off if current is flowing, and come ON at zero current. If all systems are off, and the battery is full there may be a low enough current to light the LED, switching on a load (eg landing light) will draw current, and extinguish the LED Charles On 29/12/21 01:52 pm, bob noffs wrote: > the problem with some low voltage monitors in the past was they let > you use up a lot of lipo reserve power as they were set too low.you > are right, you should be alerted=C2-as soon as alternator goes off li ne. > > On Tue, Dec 28, 2021 at 4:14 PM Charlie England > wrote: > > On 12/28/2021 2:58 PM, bob noffs wrote: >> fwiw i tried a circuit board, under the guidance of an elect. >> wizard i also=C2- built a board from scratch and in the end i >> ordered the light from perihelion .this is in the last couple of >> years. i talked to eric[owner] and he can design it for any >> voltage. and his worked, at a consistent=C2-voltage.lot differen t >> voltage for lead acid compared to lipo. >> >> On Tue, Dec 28, 2021 at 6:36 AM Jared Yates >> wrote: >> >> All it would take is someone ordering a batch of printed >> circuit boards, right? >> >> On December 28, 2021 06:09:44 "John M Tipton" >> wrote: >> >>> >>> >>> So: what we all want it seems, is for 'Bob' to reintroduce hi s >>> AEC9005 Series Low Voltage Warning mudules >> > If we're using the LV warning to alert for alternator failure, I'd > think the setpoint wouldn't change; the alternator is going to > operate at a bit north of 14V regardless of battery chemistry. > Once I know I've lost the alternator and know I'm operating on > battery power (electrically dependent engine), I want to be > finding the ground ASAP, and can monitor battery voltage with the > voltmeter. Same should apply if in IMC with an all-electric panel, > though urgency might be a *little* lower if battery consumption is > lower. > > > Virus-free. www.avast.com > > > > <#m_5199142161192957910_DAB4FAD8-2DD7-40BB-A1B8-4E2AA1F9FDF2> > ________________________________ Message 4 _____________________________________ Time: 08:45:39 AM PST US Subject: AeroElectric-List: Re: Low voltage warning light From: "user9253" Here is a link to a homemade low voltage indicator circuit: https://www.homemade-circuits.com/low-battery-indicator-circuit-using-two/ -------- Joe Gores Read this topic online here: http://forums.matronics.com/viewtopic.php?p=505522#505522 ------------------------------------------------------------------------------------- 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.