Today's Message Index:
----------------------
1. 12:08 PM - Re: Re: IVO current limiter project (Robert L. Nuckolls, III)
2. 12:08 PM - Re: Re: Rotax Charging System (Robert L. Nuckolls, III)
3. 02:56 PM - Did you install a "battery bus"? (Mickey Coggins)
4. 03:12 PM - Re: Did you install a "battery bus"? (Peter Pengilly)
5. 03:33 PM - Re: Did you install a "battery bus"? (Robert Borger)
6. 06:22 PM - Re: Did you install a "battery bus"? (Sebastien)
7. 06:34 PM - Re: Battery Minder connector (ronaldcox)
8. 08:55 PM - Re: Did you install a "battery bus"? (Art Zemon)
Message 1
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Subject: | Re: IVO current limiter project |
At 09:29 PM 9/17/2018, you wrote:
>The last 2 posts I saw on this were these 2:
>
>Robert L. Nuckolls, III <nuckolls.bob@aeroelectric.com>
>Fri 7/21/2017, 12:23 PM
>Got the board stuffed.
>
>http://tinyurl.com/ycemckye
>
>I need to get my pic programmer up and running
>for a couple other programs. I'll pop a 9023 chip
>and see how critter works.
>
> Bob . . .
>
>AND
>
>Paul A. Fisher <paulf@hughes.net>
>Wed 10/4/2017, 11:53 AM
>Bob and all,
>Did we ever finish this project? The message attached below was the
>last one I heard about it. I don't know if that means it worked,
>that it didn't work and we gave up, or everyone just lost interest.
>I don't have an IVO prop, so I don't need the limiter. I just
>wondered if the software that I contributed needs any additional refinement.
>Paul A. Fisher
>Q-200, N17PF
>RV-7A, N18PF
>
>If there was a limiter produced I didn't see it.
>
>Deems
Okay guys . . . looks like I dropped the ball on this
one. I'll hide behind the 'too many projects' phenomenon.
Got another grand-kid living with us for a year to
try alternatives to Wichita schools . . . etc. But
that's not an excuse. I'll dig around and get that
package together.
I know Paul had sent me some POC software and I
don't recall having loaded it into a chip. We'll
get that pot back on a front burner today.
Bob . . .
Message 2
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Subject: | Re: Rotax Charging System |
At 10:24 PM 9/17/2018, you wrote:
>>I wonder if that capacitor is an artifact from back when PM
>>alternators were operated in vehicles that were designed with no
>>battery. Not unlike the avionics master as a holdover from the
>>prehistoric germanium semiconductor days.
>>
>>Charlie
>
> An excellent hypothesis . . . but it seems
> it equally likely that somebody looked at that
> full wave rectifier downstream of an AC
> source and thought, "Gee, every circuit like
> that in the past has had a capacitor across
> the output . . . shucks . . . why not?"
Let's noodle some of the math that helps
us figure out just how effective a capacitor
might be for 'filtering' a PM alternator system:
A fundamental quality of capacitors is described
by this formula:
Volts/Second = Amps/Farad
meaning that if you apply 1 amp of constant
current to a 1 Farad capacitor, you'll see
voltage across the capacitor rise at a rate
of 1 Volt per Second.
How rapidly will the voltage change
across at 22,000uF capacitor in a
PM alternator system with 10A load
assuming the positive excursion has just
charged the capacitor to the expected peak
voltage?
V/S = 10/0.022 = 454 Volts/Second or let's
say about 500 mVolts/mSecond.
Adding a 500 mV/mS plot to the no-capacitor
plot of SD8 performance we see
Emacs!
By inspection we can deduce that the addition of
22KuF to the output would have no appreciable effect
on the voltage plot shown. If we put a 47KuF cap
on it (less than 1/2 the slope) we might see a reduction
in pk-pk excursion to something on the order of 200mV
. . . but why bother? We know that appliances qualified to run
in aircraft EXPECT to see noises equal to or perhaps
greater than what's depicted above with no capacitor.
I might also add that automotive electrical systems
are completely devoid of electrical system noise
filters that address the spectrum of alternator
ripple and switching.
So if there is a reason based on physics for adding
capacitors to the PM alternators, it's not intuitively
clear.
Bob . . .
Message 3
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Subject: | Did you install a "battery bus"? |
Hi,
I'm struggling to find anything that really needs to be connected to an
always-hot battery bus.
I have an io360 with pmags which will power themselves in case of issue
with the normal power bus, my mission is vfr day, GRT EFIS, Trig Radio and
transponder, some lights (that I don't really need), and that's about it.
I could see some value in an always hot cigar lighter-type connection to
charge a phone while on the ground, or to send some electrons to the
battery, but not much else.
Am I missing something or are there others that don't have a battery bus?
Mickey Coggins
Message 4
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Subject: | Did you install a "battery bus"? |
Clock is about the only thing
From: owner-aeroelectric-list-server@matronics.com
<owner-aeroelectric-list-server@matronics.com> On Behalf Of Mickey
Coggins
Sent: 18 September 2018 13:36
Subject: AeroElectric-List: Did you install a "battery bus"?
Hi,
I'm struggling to find anything that really needs to be connected to an
always-hot battery bus.
I have an io360 with pmags which will power themselves in case of issue
with the normal power bus, my mission is vfr day, GRT EFIS, Trig Radio
and transponder, some lights (that I don't really need), and that's
about it.
I could see some value in an always hot cigar lighter-type connection to
charge a phone while on the ground, or to send some electrons to the
battery, but not much else.
Am I missing something or are there others that don't have a battery
bus?
Mickey Coggins
Message 5
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Subject: | Re: Did you install a "battery bus"? |
Some GPS units have a keep-alive circuit requiring connection to a battery buss.
Ensures that the GPS is always ready to go without the usual boot up time.
On Sep 18, 2018, at 7:35 AM, Mickey Coggins <mick-matronics@rv8.ch> wrote:
Hi,
I'm struggling to find anything that really needs to be connected to an always-hot
battery bus.
I have an io360 with pmags which will power themselves in case of issue with the
normal power bus, my mission is vfr day, GRT EFIS, Trig Radio and transponder,
some lights (that I don't really need), and that's about it.
I could see some value in an always hot cigar lighter-type connection to charge
a phone while on the ground, or to send some electrons to the battery, but not
much else.
Am I missing something or are there others that don't have a battery bus?
Mickey Coggins
Message 6
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Subject: | Re: Did you install a "battery bus"? |
I have an always hot plug that I can use to either charge the battery or
power an accessory (12v air pump, phone charger). I use automotive
connector plugs rather than cigarette lighter plugs but basically one
cigarette lighter plug wired directly to the battery can be very handy but
I can't figure out a use for anything more.
On Sep 18, 2018 16:01, "Mickey Coggins" <mick-matronics@rv8.ch> wrote:
Hi,
I'm struggling to find anything that really needs to be connected to an
always-hot battery bus.
I have an io360 with pmags which will power themselves in case of issue
with the normal power bus, my mission is vfr day, GRT EFIS, Trig Radio and
transponder, some lights (that I don't really need), and that's about it.
I could see some value in an always hot cigar lighter-type connection to
charge a phone while on the ground, or to send some electrons to the
battery, but not much else.
Am I missing something or are there others that don't have a battery bus?
Mickey Coggins
Message 7
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Subject: | Re: Battery Minder connector |
You might try something like one of these.
https://www.ebay.com/p/Authentic-Anderson-Sb50-Connector-Kit-Gray-8-AWG-2-Pack-2-Connectors/1856190812?iid=221669705387&chn=ps
Designed for golf carts, so would certainly handle the current.
You could hard-mount one end flush in the fuselage somewhere, and have a robust
one-hand connection.
Ron
--------
Ron Cox
Glasair Super II F/T
Under Construction at C77 - Still just about to fly!
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=483275#483275
Message 8
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Subject: | Re: Did you install a "battery bus"? |
Mike,
I have a battery bus but it only powers two things: the keep-alive line for
my MGL EFIS and an LED ceiling light (which has its own on/off switch).
If your EFIS doesn't require any keep-alive then you truly might not need a
battery bus.
And remember... nothing is forever. If you start without one and change
your mind, it's OK. You can add a battery bus.
Cheers,
-- Art Z.
On Tue, Sep 18, 2018 at 5:13 PM Mickey Coggins <mick-matronics@rv8.ch>
wrote:
> Hi,
>
> I'm struggling to find anything that really needs to be connected to an
> always-hot battery bus.
>
> I have an io360 with pmags which will power themselves in case of issue
> with the normal power bus, my mission is vfr day, GRT EFIS, Trig Radio and
> transponder, some lights (that I don't really need), and that's about it.
>
> I could see some value in an always hot cigar lighter-type connection to
> charge a phone while on the ground, or to send some electrons to the
> battery, but not much else.
>
> Am I missing something or are there others that don't have a battery bus?
>
--
https://CheerfulCurmudgeon.com/
*"We do not see the world as it is. We see the world as we are."*
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