Today's Message Index:
----------------------
1. 12:22 AM - 20 Amp Solid State Relay (C William Sallas)
2. 09:10 AM - B+C alternator problem (James Baldwin)
3. 10:38 AM - Re: Kitplanes article on an Elegant LED driver (PSYCHOSE)
4. 03:49 PM - Re: What is the best value battery right now? (Robert L. Nuckolls, III)
5. 03:58 PM - Re: Re: Kitplanes article on an Elegant LED driver (Robert L. Nuckolls, III)
6. 06:14 PM - Re: Kitplanes article on an Elegant LED driver (Brantel)
Message 1
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Subject: | 20 Amp Solid State Relay |
What is the status of AeroElectric's 20 amp solid state relay?
Message 2
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Subject: | B+C alternator problem |
Bob (and anyone using the LR-3 regulator),
Before taking any drastic action like removing or replacing the LR3B
regulator I downloaded the troubleshooting guide from B+C. With my new DVM
I performed all of the suggested measurements and found the regulator to be
doing as it should, no abnormalities. I called Bill at B+C and asked about
the PTT (push to test) switch shown connected to pin 2 and what it did. It
shorts pin 6 right to ground internally for the OV test. He suggested that
the switch really wasn't needed and had given some problems to others in the
past. In my case it was the intermittent switch that was blowing fuses no
matter which value. So, if you have any problems with blowing the fuse or
C/B shown connected to the alternator field circuit this might be a factor.
Thanks to Bob for helping, the airplane is back in the air. JBB
Message 3
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Subject: | Re: Kitplanes article on an Elegant LED driver |
Thanks for your response Bob.
Pardon my ignorance, but I surmise that the capacitances and 100 mH inductance
included in your diagram are embedded in the "101" component we see in one of
the photos.
If this is correct, could you provide the part number of this device?
Finally, did you or Brian get a chance to test your design for EMI in the RF range?
regards,
Normand RV8 wings
--------
Normand Gingras RV8 wings
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p 7372#207372
Message 4
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Subject: | Re: What is the best value battery right now? |
At 09:30 AM 10/3/2008 -0700, you wrote:
>
>I have an RV-8 with an IO-360 180 hp engine and need to replace the
>current battery. I think it is a RG-25XC. In past topics I've seen the
>Odessey PC-680 mentioned along with the Powersonic (?) PS-12180, Panasonic
>LC-X1220P and a LC-RD1217P.
>
>Is there a current favorite that can be found for a reasonable price? If
>so, please post name, model, and a good source.
>
>Thanks,
>
>John
How do you quantify "value"? Lacking data beyond statements
like "My brand Z battery has been in the airplane 5 years
and it still starts my engine" what qualities in a battery
are most important to you. Further, how much $time$ are you
willing to spend to acquire, maintain and monitor that battery
for ability to meet your design goals?
If you're a day vfr airplane, don't care about alternator-out
endurance and will accept a risk of having to hand-prop the engine
or replace a battery off the home field, then anecdotal offerings
of 5-year service life may be useful to you.
On the other hand, if you have a design goal of x.x hours alternator-
out operation of the endurance bus then meeting the design goal
is driven not only by the demonstrated robustness of the battery
but your willingness to do periodic capacity tests to make sure
the design goals are not violated.
Right now, periodic capacity testing involves either running
your e-bus from the battery and seeing how long it takes to
get down to 11.0 volts -or- doing on-purpose capacity measurements
with some device like . .
http://westmountainradio.com/CBA.htm
that will allow you to do a precise evaluation of your
battery's ability to perform.
Here's where you have to make a judgement of value based
on the economics of $time$. You buy a battery for $time$,
buy a piece of test equipment for $time$ and then invest
$time$ at each determination for continued airworthiness
against your design goals. Nobody can advise you as to
the trade offs without knowing your personal quantification
on $time$.
I've often suggested that the highest value batter is that
which meets all design goals with a minimum expenditure
of $time$. Consider that if you buy the least expensive battery
you can find, say . . .
http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail?name=522-1014-ND
http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail?name=P231-ND
http://www.batteryuniverse.com/Sealed-Lead-Acid/CSB/GH12170/GZ12180NB_CSB_GH12170_Sealed-Lead-Acid
and divide the cost of acquisition by hours flown per year
and simply replace it every annual, you now have a hard data
number for the cost of meeting your design goals.
Periodic replacement of an inexpensive battery eliminates
the $time$ one is tempted to invest in a $high-quality$ battery,
$test-equipment$ and the $time$ to exercise that equipment
until the battery finally shows that it's no longer airworthy.
That's a decision that nobody can make for you. Further,
lacking that detail in a value-study, your choice of product
made from the anecdotal influences here on the List are
not much better than basing it on a television advertisement.
You will find a host of experiences ranging from "that's a
piece of trash" to "best battery since they started slicing
bread". Nobody is lying to you. Maybe nobody is trying to
persuade you. But if you NEED for the battery to perform
to some expectations for alternator-out endurance, none of
this will be useful data for getting the most return on
expenditure of your flying dollars.
Bob . . .
Message 5
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Subject: | Re: Kitplanes article on an Elegant LED driver |
At 10:36 AM 10/4/2008 -0700, you wrote:
>
>Thanks for your response Bob.
>
>Pardon my ignorance, but I surmise that the capacitances and 100 mH
>inductance included in your diagram are embedded in the "101" component
>we see in one of the photos.
>
>If this is correct, could you provide the part number of this device?
>
>Finally, did you or Brian get a chance to test your design for EMI in the
>RF range?
>
>regards,
The input and output filters are 100 uH, 1A inductors
flanked both sides by 0.1 uF and 0.001 uF monolythic
ceramic capacitors.
The parts values are a WAG based on availability of
high-current surface mount inductors and inventory.
I was hoping to get a window of opportunity to run
the assembly through the lab for a quick look-see
at DO-160 conducted performance but it didn't come
to pass. So I had to forward the assembly you see to
Brian for A-B comparison in his as-installed environment.
Successful mitigation of Brian's observed interference
doesn't necessary mean we have the "golden design",
on that noises have been attenuated sufficiently
to meet his needs.
If it works for Brian, I'm willing to publish the
board artwork for the device along with the bill of
materials and sources. Haven't heard from Brian yet.
Bob . . .
Message 6
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Subject: | Re: Kitplanes article on an Elegant LED driver |
Hey guys,
I received the prototype sometime this week. I have been on vacation and will
test and report as soon as possible.
Most likely will be Monday or Tuesday evening.
Best regards,
Brian C.
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p 7394#207394
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