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
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| Subject: | 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
<https://gammatronixltd.com/epages/bae94c71-c5b6-4572-89a1-e89006e78fbe.s
f/e
n_GB/?ObjectPath=/Shops/bae94c71-c5b6-4572-89a1-e89006e78fbe/Categories
/Cate
gory1> 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
<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" <johntiptonuk@hotmail.com
<mailto:johntiptonuk@hotmail.com> > wrote:
<johntiptonuk@hotmail.com <mailto:johntiptonuk@hotmail.com> >
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
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Message 2
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| Subject: | 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 <ceengland7@gmail.com>
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 <email@jaredyates.com> 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" <johntiptonuk@hotmail.com>
>> 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.
>
>
> <https://www.avast.com/sig-email?utm_medium=email&utm_source=link&utm_campaign=sig-email&utm_content=emailclient&utm_term=icon> Virus-free.
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Message 3
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| Subject: | Re: Low voltage warning light |
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 <ceengland7@gmail.com>
> 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
>> <email@jaredyates.com> 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"
>> <johntiptonuk@hotmail.com> wrote:
>>
>>> <johntiptonuk@hotmail.com>
>>>
>>> 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.
>
> <https://www.avast.com/sig-email?utm_medium=email&utm_source=li
nk&utm_campaign=sig-email&utm_content=emailclient&utm_term=icon>
> Virus-free. www.avast.com
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>
> <#m_5199142161192957910_DAB4FAD8-2DD7-40BB-A1B8-4E2AA1F9FDF2>
>
Message 4
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| Subject: | Re: Low voltage warning light |
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
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