Today's Message Index:
----------------------
1. 06:47 AM - Re: Re: Automatic Headlight Hi/Lo Fallover Circuit (Robert L. Nuckolls, III)
2. 12:59 PM - Re: Re: Automatic Headlight Hi/Lo Fallover Circuit (Carlos Trigo)
3. 02:12 PM - Re: Dynon Compass mounting (Vernon Smith)
4. 03:28 PM - Clarification between: main/essential/battery bus? (mikef)
5. 04:13 PM - Re: Clarification between: main/essential/battery bus? (Matt Prather)
6. 04:16 PM - Re: Dynon Compass mounting (Jim Jewell)
7. 04:44 PM - Re: Re: Automatic Headlight Hi/Lo Fallover Circuit (Ralph Hoover)
8. 05:43 PM - Re: Dynon Compass mounting (Emrath)
9. 10:13 PM - Re: Attitude gyro problem. (Nick1)
Message 1
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| Subject: | Re: Automatic Headlight Hi/Lo Fallover Circuit |
At 08:30 PM 7/4/2007 -0400, you wrote:
>
>Several turns of heavy magnet wire ~18 ga wound the length of a magnetic
>reed switch in place of the .01 ohm resistor and you could bias the FET on
>when the current flow stops. A similar idea is used to drive the bulb
>failure indicator on some cars (Volvo, uses a Bosch module) It turns on a
>warning bulb not an FET but the idea is there.
Not sure what you're referring to here . . . perhaps your
message was truncated?
I considered a variety of current sensing techniques for
the article but settled on the reed switch as the simplest
and most likely to be successfully assembled by a neophyte.
The last few circuits I designed that included a non-contact,
current sense feature used hall devices from Amploc. See:
http://amploc.com/HANDBOOK%204.pdf
I use these critters a lot when I need to grab a
medium quality current value from a wire in an airplane
where I need to avoid cutting into it for a shunt.
Bob . . .
Message 2
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| Subject: | Re: Automatic Headlight Hi/Lo Fallover Circuit |
> I considered a variety of current sensing techniques for
> the article but settled on the reed switch as the simplest
> and most likely to be successfully assembled by a neophyte.
> The last few circuits I designed that included a non-contact,
> current sense feature used hall devices from Amploc. See:
>
> http://amploc.com/HANDBOOK%204.pdf
>
> I use these critters a lot when I need to grab a
> medium quality current value from a wire in an airplane
> where I need to avoid cutting into it for a shunt.
>
> Bob . . .
Bob
And with this critters as current sensors, which is the dedicated digital
indicator we can use in our aircraft's instrument panel ?
Carlos
Message 3
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| Subject: | Dynon Compass mounting |
Thanks for asking the question and the answers. I was running into the same
dilemma. Dan's solution is much easier than mine.
Vern Smith
do not archive
From: N81JG@aol.comDate: Thu, 5 Jul 2007 01:43:56 -0400Subject: Re: AeroEle
ctric-List: Dynon Compass mountingTo: aeroelectric-list@matronics.com
www.rvproject.com Many photos of the magnetometer installation of Dan Chec
koway in his construction log.
John
See what's free at AOL.com.
_________________________________________________________________
PC Magazine=92s 2007 editors=92 choice for best web mail=97award-winning Wi
ndows Live Hotmail.
ration_HMWL_mini_pcmag_0707
Message 4
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| Subject: | Clarification between: main/essential/battery bus? |
Hi,
I'm a new aircraft owner and am considering reworking the electrical system, and
my av electric knowledge is rudimentary. I am having a hard time understanding
the difference between the main, essential, and battery bus. I've have, and
have read the AeroConnection and the figure 17-3 is what I think I'd like to
get to given my aircraft and flying type.
I guess I am mostly confused over what is essential vs battery bus. I would think
anything categorized as essential would need to be on the battery bus too.
Thanks for any clarification,
Mike
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=122419#122419
Message 5
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| Subject: | Re: Clarification between: main/essential/battery |
bus?
It's been a while since I've thought about this, but here are a couple of
items:
- The "essential bus" has been renamed to "endurance bus" to make the
name more accurately reflect the purpose - namely to efficiently provide
power to the items that you need in order to comfortably complete a
flight after the failure of the primary electrical energy source
(alternator). Switching the main bus off and leaving the endurance bus
on offers a single switch method of load shedding..
- The battery bus should power the items that are needed to keep the
engine running while the rest of the electrical system is de-energized.
If your engine has EFI or electronic ignition, it should probably powered
from the battery bus. Additionally, certain accessories might be powered
from the battery bus - maybe a cabin courtesy/panel light.
Nav/comm/txp equipment shouldn't be on the battery bus - not required for
keeping the engine running. An EFI fuel pump shouldn't be on the
endurance bus..
Regards,
Matt-
>
> Hi,
>
> I'm a new aircraft owner and am considering reworking the electrical
> system, and my av electric knowledge is rudimentary. I am having a hard
> time understanding the difference between the main, essential, and battery
> bus. I've have, and have read the AeroConnection and the figure 17-3 is
> what I think I'd like to get to given my aircraft and flying type.
>
> I guess I am mostly confused over what is essential vs battery bus. I
> would think anything categorized as essential would need to be on the
> battery bus too.
>
> Thanks for any clarification,
>
> Mike
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=122419#122419
>
>
Message 6
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| Subject: | Re: Dynon Compass mounting |
My solution was to mount the Dynon D10-A magnetometer well forward on
the horizontal stab deck below the vertical stab. After 30 hours of
flight it works there with good accuracy. No magnetic deflection from
the chrome molly steel elevator horns or rudder cables some 18 to 20
inches away. The temperature sensor is mounted on the fuse right hand
side in the shade under the horizontal stab.
Jim in Kelowna
----- Original Message -----
From: Vernon Smith
To: aeroelectric-list@matronics.com
Sent: Thursday, July 05, 2007 2:07 PM
Subject: RE: AeroElectric-List: Dynon Compass mounting
Thanks for asking the question and the answers. I was running into the
same dilemma. Dan's solution is much easier than mine.
Vern Smith
do not archive
-------------------------------------------------------------------------
---
From: N81JG@aol.com
Date: Thu, 5 Jul 2007 01:43:56 -0400
Subject: Re: AeroElectric-List: Dynon Compass mounting
To: aeroelectric-list@matronics.com
www.rvproject.com Many photos of the magnetometer installation of
Dan Checkoway in his construction log.
John
-------------------------------------------------------------------------
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See what's free at AOL.com.
ist"
target=_blank>http://www.matronics.com/Navigator?AeroElectric-List
p://forums.matronics.com
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-----
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mail=97award-winning Windows Live Hotmail. Check it out!
Message 7
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| Subject: | Re: Automatic Headlight Hi/Lo Fallover Circuit |
Bob,
Sorry I wasn't clear. The magnetic current sense element as
described could be applied to the circuit described by Eric and thus
eliminating the gain block and the series resistor required to develop
the I/R drop that is the input to the gain block. Just after sending my
previous post I saw your sensor circuit post. So my concept was to
utilize the reed switch to turn on the FET just as you suggest turning
on the LED indicator. The Volvo/Bosch module is interesting in that it
uses a bifilar winding with current from one bulb going one way and
current from the other in a pair (say front and rear right turn signal).
If both bulbs are burning the fields cancel and no warning. This
eliminates the problem of triggering a warning if the lights are turned
off or flashing. The only state that will switch the module is
unbalanced current in the 2 coils as in only one bulb lighted.
Ralph Hoover
RV7A
Robert L. Nuckolls, III wrote:
> <nuckollsr@cox.net>
>
> At 08:30 PM 7/4/2007 -0400, you wrote:
>
>> <hooverra@verizon.net>
>>
>> Several turns of heavy magnet wire ~18 ga wound the length of a
>> magnetic reed switch in place of the .01 ohm resistor and you could
>> bias the FET on when the current flow stops. A similar idea is used
>> to drive the bulb failure indicator on some cars (Volvo, uses a Bosch
>> module) It turns on a warning bulb not an FET but the idea is there.
>
> Not sure what you're referring to here . . . perhaps your
> message was truncated?
>
> I considered a variety of current sensing techniques for
> the article but settled on the reed switch as the simplest
> and most likely to be successfully assembled by a neophyte.
> The last few circuits I designed that included a non-contact,
> current sense feature used hall devices from Amploc. See:
>
> http://amploc.com/HANDBOOK%204.pdf
>
> I use these critters a lot when I need to grab a
> medium quality current value from a wire in an airplane
> where I need to avoid cutting into it for a shunt.
>
> Bob . . .
>
>
--
Ralph C. Hoover
RV7A
hooverra at verizon dot net
Message 8
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| Subject: | RE: Dynon Compass mounting |
Thanks to everyone for their comments and thoughts. I forget to check Dan's
site first. While not exactly what I'd seen, that has started my o'grey
matter to think of what to do. The tail cone seems like a neat idea unless
you even need to service it. Then I'll need a "baggage compartment monkey"
to get back there and fix it, not to be confused with a "trunk monkey".
Marty
-----Original Message-----
From: Emrath [mailto:emrath@comcast.net]
Sent: Wednesday, July 04, 2007 9:51 AM
Subject: Dynon Compass mounting
I have seen some pictures of the EDC-10 compass mounting in a side by side
RV behind the baggage compartment near the top of the fuselage but I have
lost the reference for these pictures. I would like to review how this was
accompished to be able to replicate in my ship flattering the inventor of
this install method. Does anyone have pictures of their installation of the
compass module behind the baggage compartment bulkhead that they can share
with me?
Marty in Brentwood TN
RV-6A panel wiring and sanding fiberglass.
Message 9
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| Subject: | Re: Attitude gyro problem. |
Greg,
Just curious what was the problem?
Do you need any more suggestions?
Nick
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=122481#122481
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