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raymondj(at)frontiernet.n
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 Posted: Tue Mar 26, 2013 1:16 pm Post subject: LED similar to EL strip |
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Greetings,
Saw this item and thought of the EL strips that were so noisy. This is listed as a flat LED.
http://www.jameco.com/webapp/wcs/stores/servlet/ProductDisplay?langId=-1&storeId=10001&productId=2153174&catalogId=10001&CID=PDF
[quote]--
Raymond Julian
Kettle River, MN.
"And you know that I could have me a million more friends,
and all I'd have to lose is my point of view." - John Prine [b]
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mrspudandcompany(at)veriz
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| Posted: Tue Mar 26, 2013 6:00 pm Post subject: LED similar to EL strip |
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| Quote: | Saw this item and thought of the EL strips that were so noisy. This is listed as a flat LED.
http://www.jameco.com/webapp/wcs/stores/servlet/ProductDisplay?langId=-1&storeId=10001&productId=2153174&catalogId=10001&CID=PDF
| Quote: | I get the impression from some of the recent posts that some seem to think that LED lights are noisy. THEY ARE NOT NOISY!
The high power leds need to have a current regulated supply, and one of the more efficient methods of producing a regulated current is to use a switching supply, which has an oscillator built in. This oscillator is often the culpret that radiates the RF which gets into our radio receivers. These regulators can be designed quite easily to be quiet. Most of the ones that we experimental aircraft builders are having a noise problem with were originally built for automotive use where noise in the 120mhz range was not an issue.
Roger
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I am using the Free version of SPAMfighter.SPAMfighter has removed 383 of my spam emails to date.Do you have a slow PC? Try a free scan! [quote][b]
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nuckolls.bob(at)aeroelect
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| Posted: Wed Mar 27, 2013 8:18 am Post subject: LED similar to EL strip |
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At 08:58 PM 3/26/2013, you wrote:
Saw this item and thought of the EL strips that were so noisy. This is listed as a flat LED.
http://www.jameco.com/webapp/wcs/stores/servlet/ProductDisplay?langId=-1&storeId=10001&productId=2153174&catalogId=10001&CID=PDF
I get the impression from some of the recent posts that some seem to think that LED lights are noisy. THEY ARE NOT NOISY!
The high power leds need to have a current regulated supply, and one of the more efficient methods of producing a regulated current is to use a switching supply, which has an oscillator built in. This oscillator is often the culpret that radiates the RF which gets into our radio receivers. These regulators can be designed quite easily to be quiet. Most of the ones that we experimental aircraft builders are having a noise problem with were originally built for automotive use where noise in the 120mhz range was not an issue.
Roger
Cool find Roger . . . I'll pursue it.
EL (electroluminescent) lights are essentially
capacitors with a dielectric that emits
light when excited by an alternating electro-static
field of generally 40-200 volts range and 200 to
1000 Hz.
LED lights are solid state diode junctions that
emit light when excited by a current flow in the
forward direction across the junction.
Neither light technology is inherently noisy.
The EL technology requires a DC to AC converter.
It's usually variable to adjust for relative
lamp brightness. LED's run happily on DC excitation
taken directly from the bus . . . again paired
with some technology for varying the current to
the lamp.
Rudimentary controls comprised of series resistance
are inefficient but tolerable for small loads.
The high power LEDs perform best when supplied by
constant current DC to DC sources. These can
be variable under pilot control or fixed depending
on application of the lights.
ALL of our discussions here on the List about
"noisy lights" have centered on high power applications
for LEDs as position lights and more recently, landing
and taxi lights. The solid state lamps are not inherently
noisy but the power supplies needed for efficient
utilization can be and often are objectionably noisy
for use on airplanes.
The discussions have pondered techniques for adapting
commercial off the shelf examples of such products
to our airplanes by first determining if there noise
levels are acceptably low and then applying additional
filters as necessary. It's easy to build power supplies
that are airplane friendly . . . but suppliers of
the attractive COTS products probably couldn't care less
about getting their products onto airplanes.
The item featured in the Jameco catalog has an
interesting form factor reminiscent of an EL light
panel. I'll get one and see what it's all about.
[img]cid:.0[/img]
Several readers have noted the proliferation of led strip
lights fitted with multiple surface mounted LEDs.
Here's one of many examples:
http://tinyurl.com/chsx9j2
These are assemblies 3LED/1Resistor modules about
2" in length. Long strips can be cut to length
between modules.
These are very user friendly. I've got plans to
use about 100 feet of these strips in an overhaul
of room and counter lighting in my kitchen.
Bob . . .
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nuckolls.bob(at)aeroelect
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| Posted: Thu Mar 28, 2013 6:28 am Post subject: LED similar to EL strip |
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At 11:16 AM 3/27/2013, you wrote:
I've got one of these critters on order. They're back-ordered
for about 10 days. Must be a popular item. Here's the manufacturer's
data sheet
http://www.aeroelectric.com/Mfgr_Data/Lamps/JKL_Lamps/ZLP-MULTI.pdf
The item stocked by Jameco is 3.5" long by .48" wide and
draws 350 ma at it's rated 10.2 volts. It's also said to
have a max operating voltage of 12 volts. 3.5 watts
dissipated into this area and volume suggests it's a POWER
device with no particular power conditioning capabilities
built in. I.e. it would best be driven by a constant-current
power source (like the buck-pucks).
Will know more about it when we can get our hands on one.
Bob . . .
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