Today's Message Index:
----------------------
1. 06:47 AM - Re: Re: AeroLed noises (Sam Marlow)
2. 07:05 AM - Review of LEDs for aircraft lighting (Eric M. Jones)
3. 11:17 AM - Re: Noisey Power Supplies. (ROGER & JEAN CURTIS)
4. 11:26 AM - Re: Review of LEDs for aircraft lighting (Bill Watson)
5. 11:59 AM - Re: Noisey Power Supplies. (Sam Marlow)
6. 01:31 PM - Re: Noisey Power Supplies. (Eric M. Jones)
7. 01:52 PM - Re: Review of LEDs for aircraft lighting (Eric M. Jones)
8. 07:49 PM - Re: Re: Review of LEDs for aircraft lighting (Bill Watson)
Message 1
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| Subject: | Re: AeroLed noises |
Robert L. Nuckolls, III wrote:
> <nuckolls.bob@aeroelectric.com>
>
> At 11:13 AM 10/2/2011, you wrote:
>> <emjones@charter.net>
>>
>> I sell some LED tail lights and used to supply them with commercial
>> constant current supplies--Power Pucks from Luxdrive. But making them
>> quiet was another matter. I know Bob N. put together a fix for these.
>> It would be interesting to see how they worked in the field...
>
> We've just about used up the initial stocking order of
> filter boards for the AEC9051 filtered driver boards.
> Individuals who ordered boards to add to their existing
> BukPucks never got back to me . . . further, I've not
> had any complaints/returns from customers who ordered the
> fully assembled devices. It's a fair assumption that
> the product is producing the expected result in the
> field. I did get into the RFI lab to take a peek at
> DO160 conducted emissions for the AEC9051 and found it
> to be well within limits.
>
> The reason I asked about TSO/STC on the AeroLED products
> is because a holy-watered product would have been tested
> to DO-160 requirements.
>
> Sam Marlow wrote:
>
> No, it's all the time, but worse with the strobes on. And no this is not
> an STC'ed or TSO'ed product.
>
> I'm mystified as to why anyone might offer a non-qualified
> device that is any less capable than their qualified device.
> The delta-dollars to manufacture two different products
> is pretty small . . . further, the risks of having an unhappy
> customer due to "cutting of corners" can be hard on business.
> Nothing travels faster than "bad news" about a product or
> the services of the company that made it.
>
> Having offered that, the question to be asked and answered
> by AeroLed is, "Is there a difference in electromagnetic
> compatibility between your certificated and non-certificated
> products?" If the answer is yes, the next question is, "How
> was it determined that the owner of an OBAM aircraft would
> be any more tolerant of noise in the radios than the owner
> of a TC aircraft?"
>
> Sam, I'm not sure I asked my question of you clearly. You
> spoke of landing lights and strobes. I understand that the
> noise increased with strobes on versus off. But if there
> is some form of noise with the strobes off . . . does this
> noise go away when the landing lights are off? We need
> to be REALLY sure that the offending noises are coming from
> both products.
>
> In the unfathomable wisdom of HBC management, they sold
> all their investigative and qualification test facilities
> to Wichita State University. I used to be able to sneak in
> and get a quick look-see on the EMC performance of various
> devices. Now, even though the cost of doing a 5 minute test
> is quite reasonable, the cost and time delays for doing a
> purchase order, awaiting a quote, exercising a contract
> and getting on a schedule has built a very effective
> barrier between WSU as a supplier and myself as a potential
> customer.
>
> I've got a broad-band receiver and conductive emissions
> pickup transformers to do the work on my bench . . . but
> no time in the foreseeable future to get the setup
> calibrated.
>
> So tackling the problem before us is reduced to cut-n-try
> processes on the airplane. Fortunately, after 45 years
> of shepherding various products through the labs . . . we're
> not operating completely in the dark. Let's work to identify
> the players first, then the propagation paths, and finally
> some first-pass experiments to identify a solution.
>
> Bob . . .
>
>
I'll research further, and get back to you. Thanks.
Message 2
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| Subject: | Review of LEDs for aircraft lighting |
I see dozens of newbies patching together LEDs for aircraft lighting and am frequently
mortified. Remember, when your family gets called and told that another
plane with homemade night-lighting killed you, everybody carries some blame
for letting it happen.
Item: It is theoretically impossible to build a tail light using LEDs that draws
200 mA and cost $89. Strobe too! And it won't even be possible when my now preschool
grand-kid graduates from MIT.
Item: It is theoretically impossible to adjust 26 tiny LEDs to form a position
light, even if the peak candelas times 26 comes out to some kind of legal-sounding
number.
Item: I quit selling LED position lights (but still sell a few tail lights), that
really are legal. I just could not compete with the claims of the poor quality
stuff. In fact one of my customers, having lost his regular landing lights,
landed at night using ONLY the LED position lights for illumination. This might
have been a historic landing.
See attached.
--------
Eric M. Jones
www.PerihelionDesign.com
113 Brentwood Drive
Southbridge, MA 01550
(508) 764-2072
emjones@charter.net
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=353875#353875
Attachments:
http://forums.matronics.com//files/led_lighting_article_draft_13may08_182.pdf
Message 3
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| Subject: | Noisey Power Supplies. |
So I changed them all to tomb-silent LM317-based constant current supplies
and never heard another peep. I will send you the documentation for a Roll
Your Own version (attached), and am considering making a slicker version
later (also attached).
Eric M. Jones
Attachments:
http://forums.matronics.com//files/current_regulator_194.pdf
http://forums.matronics.com//files/canopy_latches_for_bipolar_leds_876.pdf
The second attachment does not open for me!
Message 4
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| Subject: | Re: Review of LEDs for aircraft lighting |
Did you ever take a look at "Jeff's" LED wing tip position lights (and
regular strobe) for RVs? If so, what did you think?
http://www.jeffsrv-7a.com/LEDPROJECT.htm
No specs here. "Jeff's lights are no longer available as far as I know.
On 10/3/2011 10:02 AM, Eric M. Jones wrote:
> --> AeroElectric-List message posted by: "Eric M. Jones"<emjones@charter.net>
>
> I see dozens of newbies patching together LEDs for aircraft lighting and am frequently
mortified. Remember, when your family gets called and told that another
plane with homemade night-lighting killed you, everybody carries some blame
for letting it happen.
>
> Item: It is theoretically impossible to build a tail light using LEDs that draws
200 mA and cost $89. Strobe too! And it won't even be possible when my now
preschool grand-kid graduates from MIT.
>
> Item: It is theoretically impossible to adjust 26 tiny LEDs to form a position
light, even if the peak candelas times 26 comes out to some kind of legal-sounding
number.
>
>
Message 5
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| Subject: | Re: Noisey Power Supplies. |
ROGER & JEAN CURTIS wrote:
> --> AeroElectric-List message posted by: "ROGER& JEAN CURTIS"<mrspudandcompany@verizon.net>
>
>
> So I changed them all to tomb-silent LM317-based constant current supplies
> and never heard another peep. I will send you the documentation for a Roll
> Your Own version (attached), and am considering making a slicker version
> later (also attached).
> Eric M. Jones
>
> Attachments:
>
> http://forums.matronics.com//files/current_regulator_194.pdf
> http://forums.matronics.com//files/canopy_latches_for_bipolar_leds_876.pdf
>
>
> The second attachment does not open for me!
>
>
Won't open for me either!
Message 6
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| Subject: | Re: Noisey Power Supplies. |
Sorry, the second attachment was supposed to be deleted because I never referred
to it. But here it is anyway. It is self explanatory.
--------
Eric M. Jones
www.PerihelionDesign.com
113 Brentwood Drive
Southbridge, MA 01550
(508) 764-2072
emjones@charter.net
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=353924#353924
Attachments:
http://forums.matronics.com//files/canopy_latches_for_bipolar_leds_291.pdf
Message 7
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| Subject: | Re: Review of LEDs for aircraft lighting |
Jeff's look very nice--they probably are per FAA specs position lights. I'm less
sure of the strobes, but they could be okay. Exquisite workmanship.
Can't tell more without closer inspection and specs. Some images don't want to
load on my computer from his website.
--------
Eric M. Jones
www.PerihelionDesign.com
113 Brentwood Drive
Southbridge, MA 01550
(508) 764-2072
emjones@charter.net
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=353926#353926
Message 8
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| Subject: | Re: Review of LEDs for aircraft lighting |
Thanks. I know there wasn't much info there but appreciate the reply.
Those images don't load on mine either. I think these pages have been
un-maintained for awhile.
I'm happy with them except for the noise from the pucks. Will be
installing Bob's quiet power supplies to fix the noise.
On 10/3/2011 4:49 PM, Eric M. Jones wrote:
> --> AeroElectric-List message posted by: "Eric M. Jones"<emjones@charter.net>
>
> Jeff's look very nice--they probably are per FAA specs position lights. I'm less
sure of the strobes, but they could be okay. Exquisite workmanship.
>
> Can't tell more without closer inspection and specs. Some images don't want to
load on my computer from his website.
>
> --------
> Eric M. Jones
>
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