Today's Message Index:
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1. 06:34 AM - Re: Trim tab indicator (Robert L. Nuckolls, III)
2. 06:36 AM - Re: Nipon-Denso Alternator Modifications (Robert L. Nuckolls, III)
3. 06:59 AM - Re: Trim tab indicator (user9253)
4. 08:38 AM - RG400 connectors on RG58 cable (Rob Kochman)
5. 11:02 AM - Re: RG400 connectors on RG58 cable (Robert L. Nuckolls, III)
Message 1
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| Subject: | Trim tab indicator |
At 08:29 PM 10/13/2010, you wrote:
>
>Mike
>
>If you decide to construct an indicator, it's certainly
>possible to use various single-chip microcontrollers
>to do this job. For a simpler solution, check out
>National Semiconductor's LM3914 bar graph display driver:
There's another option. We have a quantity of
Tripplet 120 minature meter movements. This
is the same core we use for the 9007 loadmeter.
These could be offered as trim indicators also
by fitting with scale plates not unlike those
shown here:
http://www.aeroelectric.com/Pictures/Instruments/Trim/Trim_Indicators.pdf
Bob . . .
Message 2
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| Subject: | Re: Nipon-Denso Alternator Modifications |
At 08:50 PM 10/13/2010, you wrote:
>Hi Bob. I've read the article describing modifying a Nipon-Denso
>internally regulated alternator to add over-voltage protection,
>leaving the internal regulator intact. My guess is this is
>essentially the same thing that Plane Power does with their
>alternators. You wrote a brief pre-amble to the article wherein you
>said you would publish feedback received from others who tried the
>mod. What if any reports have you received? While the technique
>does not give 100% control to the pilot to have absolute control
>over the alternator as you recommend in your book, can you describe
>a failure mode that would not be handled by the described
>configuration? The mod, seems to be pretty simple and an elegant
>solution to the over-voltage problem, but I don't know what I don't
>know. I guess my question really boils down to what unplanned for
>excitement/surprise/adrenaline rush (insert your own adjective)
>could be avoided if I went with an externally regulated alternator
>with overvoltage protection. Thanks very much for your help and
>insight to us electrically challenged newbies.
If anyone has successfully assumed this task, they've
not made be aware of it. Actually, the Plane Power
configuration does offer any time, any conditions, on/off
control of the alternator. There's no reason why a DIY
effort could not be crafted to accomplish the same thing.
But I'm sorry to report that I'm unaware of anyone
doing this task for their project.
Bob . . .
Message 3
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| Subject: | Re: Trim tab indicator |
Allen Fulmer's idea of connecting the trim servo pot to an EFIS is the easiest.
If no EFIS, then the schematic on page 2 of the data sheet referenced by Mike Linse will work. http://www.national.com/ds/LM/LM3914.pdf
For the 0V to 5V signal source, make a 5 volt regulator like this: http://www.tkk.fi/Misc/Electronics/circuits/psu_5v.html
Connect aircraft power to the input of the 5 volt regulator.
Connect ground and the output of the 5 volt regulator to the trim servo pot orange
and blue wires.
Connect the green wire from the servo pot to pin 5 of the LM3914N.
Joe
--------
Joe Gores
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=315708#315708
Message 4
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| Subject: | RG400 connectors on RG58 cable |
I mistakenly used RG400 connectors on an RG58 cable. Is this acceptable, or
do I need to replace the connectors? I don't know what the difference is
between the two connectors and don't want to guess whether it'll work.
Thanks...
-Rob
Message 5
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| Subject: | Re: RG400 connectors on RG58 cable |
At 10:31 AM 10/14/2010, you wrote:
>I mistakenly used RG400 connectors on an RG58 cable. Is this
>acceptable, or do I need to replace the connectors? I don't know
>what the difference is between the two connectors and don't want to
>guess whether it'll work.
As far as I know, they are interchangeable. I only
stock one connector that I've used on RG-58/141/142/400
for years.
Bob . . .
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