Today's Message Index:
----------------------
1. 05:58 AM - Re: cell phone rechargers (John Morgensen)
2. 06:10 AM - Wiring diagram question for Pitot Heat On indicator light (plevyakh)
3. 06:46 AM - 9005 LVWABM (dj45)
4. 07:32 AM - Re: 9005 LVWABM (Robert L. Nuckolls, III)
5. 07:32 AM - Re: Wiring diagram question for Pitot Heat On indicator light (Robert L. Nuckolls, III)
6. 07:40 AM - Re: follow up shielded wire/hub question (Robert L. Nuckolls, III)
7. 07:58 AM - Re: Wiring diagram question for Pitot Heat On indicator light (plevyakh)
8. 08:04 AM - Re: Wiring diagram question for Pitot Heat On indicator light (plevyakh)
9. 08:13 AM - Re: Re: AOA indicator (rayj)
10. 10:56 AM - Re: Re: Wiring diagram question for Pitot Heat On indicator light (Robert L. Nuckolls, III)
11. 07:39 PM - "Starter Engaged" Warning Light Circuit Refresher (Bob Falstad)
Message 1
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| Subject: | Re: cell phone rechargers |
Bob Noffs,
I would be very interested in duplicating your set-up. You said the
LIGHT from the phone activated the contact?
John Morgensen
On 2/16/2011 5:38 PM, bob noffs wrote:
> hi all,
> with my $10 tracfone came a car recharger so i am all set. have a
> garden tractor battery i bought for a trail cam and never used and at
> least 1/2 dz. battery tenders around . i put a contacter together
> today in a metal box with 120 volt plug and receptacle so handling a
> 15 amp load is no problem.
> i was still a little worried about something triggering the device [
> although not so much now as a power outage wont be a factor] and it
> would run something for a week or two. this morning it came to me to
> plug a timer in the power supply cord and interrupt the power to the
> circuit board every 8 hrs or so. board will shut off if on and will
> resume operation if it gets the light signals.
> including the tracfone i have $40 in this and it works like a
> million bucks!
> thanks for the input. bob noffs
> On Wed, Feb 16, 2011 at 10:17 AM, Carlos Trigo <trigo@mail.telepac.pt
> <mailto:trigo@mail.telepac.pt>> wrote:
Message 2
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| Subject: | Wiring diagram question for Pitot Heat On indicator |
light
Guys,
I'm using Bob's pitot heat.pdf schematic as the base for a "Pitot Heat ON" amber
LED light on my annunicator / warning light panel.
http://www.aeroelectric.com/PPS/DeIce/Pitot_Heat.pdf
In comparing this schematic to his article titled "Failure Detection and Annunciation
I notice a few differences in the two schematics.
http://www.aeroelectric.com/articles/Failure_Detection_and_Annunciation.pdf
Questions:
1. In pitot_heat.pdf the relay is positioned just before the Pitot heater load
and after the Reed switch sensor, vs in the second article the relay is positioned
BEFORE the Reed switch sensor. Does it matter?
2. The Reed switch current sensor wire layout is different in the two articles.
For example, the LED light wire is after the resistor in one, -vs- the LED wire
is after the Radio Shack 275-232 reed relay in the second article. Does
it matter?
3. Does anyone have a picture to share on how they boxed up and made flight worthy
the Reed Switch Current Sensor?
Thanks for any help here,
Howard
--------
Howard Plevyak
GlaStar / North Bend, Ohio
hplevyak@mac.com
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=331328#331328
Attachments:
http://forums.matronics.com//files/pitot_heat_202.pdf
http://forums.matronics.com//files/failure_detection_and_annunciation_134.pdf
Message 3
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Hi Bob,
Let me start with the warning that I am dumber than a box of rocks when it comes
to electron herding.
I just received the circuit bd. 9005-301-10. while placing the parts I find no
holes for the IN4742A Optional diode. I assume that this is needed for the battery
management function.
I sure could use some direction on this before I solder things up.
Thank you
Dan Stanton
--------
Do not archive
Dan Stanton
N9801S
99.9% Done and Flying
N226BS 99.9% done
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=331329#331329
Message 4
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At 09:43 AM 2/17/2011, you wrote:
>
>Hi Bob,
>Let me start with the warning that I am dumber than a box of rocks
>when it comes to electron herding.
>I just received the circuit bd. 9005-301-10. while placing the parts
>I find no holes for the IN4742A Optional diode. I assume that this
>is needed for the battery management function.
That part was deleted as not necessary . . .
Bob . . .
Message 5
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| Subject: | Re: Wiring diagram question for Pitot Heat On indicator |
light
At 09:07 AM 2/17/2011, you wrote:
Guys,
I'm using Bob's pitot heat.pdf schematic as the base for a "Pitot
Heat ON" amber LED light on my annunicator / warning light panel.
http://www.aeroelectric.com/PPS/DeIce/Pitot_Heat.pdf
In comparing this schematic to his article titled "Failure Detection
and Annunciation I notice a few differences in the two schematics.
http://www.aeroelectric.com/articles/Failure_Detection_and_Annunciation.pdf
Questions:
1. In pitot_heat.pdf the relay is positioned just before the Pitot
heater load and after the Reed switch sensor, vs in the second
article the relay is positioned BEFORE the Reed switch sensor. Does
it matter?
No
2. The Reed switch current sensor wire layout is different in the two
articles. For example, the LED light wire is after the resistor in
one, -vs- the LED wire is after the Radio Shack 275-232 reed relay in
the second article. Does it matter?
Depends on what you want to display.
Light ON = "Pitot heat powered up and
drawing current" (Page 3)
Light ON = "Pitot heat powered but NOT
drawing current". (Page 4)
Bob . . .
Message 6
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| Subject: | Re: follow up shielded wire/hub question |
At 01:50 PM 2/16/2011, you wrote:
>My first question needed to be more specific. My audio panel
>installation manual shows that the shielded wires are "open" (shield
>not grounded) at the end where the wires connect to the radio, and
>the shields are all grounded together at the audio panel.
>
>If I use a "hub" system, where all avionics go in and then out of
>the hub, do I keep each shield on a separate pin going in and out of
>the hub, or do I ground all the shields together going into the hub
>and then start a set of new shielded wires comng out of he hub (open
>coming out of the hub) and tie all the shields to ground at the audio panel?
Exactly where shields go to ground in small
airplanes is pretty much irrelevant. IF the
shield is connected at both ends and is obviously
a return path for signal or power, then carry
it through the hub on it's own pathway.
If the shield is not a signal/power pathway,
connect to common ground in hub (which still
needs to be carried to shield ground at the
audio panel)
FYI . . . when replying to a message lumped
with others in the 'digest' configuration, please
trim away all non-relevant text from the message.
Bob . . .
Message 7
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| Subject: | Re: Wiring diagram question for Pitot Heat On indicator |
light
Thanks Bob...that helps.
Can you comment on use of the 18AWG fuselink in the Pitot Heat.pdf schematic in
place of a 15amp fuse?
Why wouldn't I just use a 15amp fuse at the bus to protect my wire?
Thanks,
Howard
--------
Howard Plevyak
GlaStar / North Bend, Ohio
hplevyak@mac.com
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=331341#331341
Message 8
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| Subject: | Re: Wiring diagram question for Pitot Heat On indicator |
light
Thanks Bob...that helps.
Can you comment on use of the 18AWG fuselink in the Pitot Heat.pdf schematic in
place of a 15amp fuse?
Why wouldn't I just use a 15amp fuse at the bus to protect my wire?
Thanks,
Howard
--------
Howard Plevyak
GlaStar / North Bend, Ohio
hplevyak@mac.com
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=331342#331342
Message 9
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| Subject: | Re: AOA indicator |
do not archive
Thanks!
Raymond Julian
Kettle River, MN
On 02/16/2011 07:09 PM, Robert L. Nuckolls, III wrote:
> <nuckolls.bob@aeroelectric.com>
>
> At 05:23 PM 2/16/2011, you wrote:
>>
>> Are they online somewhere? Or am I looking in the wrong place?
>
> I've posted them here.
>
> http://www.aeroelectric.com/articles/Angle_of_Attack/
>
>
> Bob . . .
>
>
Message 10
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| Subject: | Re: Wiring diagram question for Pitot Heat On |
indicator light
At 10:59 AM 2/17/2011, you wrote:
>
>Thanks Bob...that helps.
>
>Can you comment on use of the 18AWG fuselink in the Pitot Heat.pdf
>schematic in place of a 15amp fuse?
>
>Why wouldn't I just use a 15amp fuse at the bus to protect my wire?
The cold resistance of a heated pitot tube is about 1/2 that of the
warmed up condition. Here's some data I gathered on a 28v tube.
Cut the resistance values by about 1/2 for a 14v tube.
[]
Further, from the time power is first applied until the
tube reaches operating temperature can be 20-60 seconds
depending on environmental conditions. A 100w tube will
nominally draw 7A at 14v, a 150w tube will be 11A.
Inrush during warm up can by 2x those values. The duration
of that inrush is protracted compared to a motor or
incandescent lamp. Hence the suggestion for a 'robust'
circuit protection. You can put in larger fuses too.
Suggest 30A for fuse. A 15A circuit breaker would probably
stay in . . . but be prepared to upsize if you get
nuisance trips.
Bob . . .
Message 11
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| Subject: | "Starter Engaged" Warning Light Circuit Refresher |
Bob N.,
I'm putting a "starter engaged" warning light in my new IFR panel. I simply hooked
the incandescent bulb from my B&C alternator "low voltage" warning light
between a fused wire that runs from the hot side of the starter contactor and
ground. (I now have the standby B&C alternator and will use its controller's
"standby alternator on" light in lieu of the low voltage light on the primary
alternator controller.)
But then I ran across a handwritten sketch that I believe you drew up for this
circuit. It has a 470 Ohm - 1 Watt resistor in the wire between the hot side
of the starter contactor and the lamp. It also shows a 1N4001 protection diode
in parallel with the lamp and ground. It isn't clear from your sketch (and
my electrical symbols knowledge is limited) whether the lamp is incandescent or
an LED. If incandescent, is the protection diode required? Recommended? If
incandescent, is the resistor required? Recommended? If the lamp is an LED,
same questions.
I can modify the circuit pretty easily right now but I'm towards the end of running
all my wires in the plane and will be finishing all the harnesses soon.
Thanks, as always, and
Best regards,
Bob Falstad
GlaStar N248BF
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