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12-21-2008, 02:40 PM
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Join Date: Jan 2005
Location: MN
Posts: 2,269
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Hey Cliff!
Quote:
Originally Posted by striplic
Question: How does the cyan led with 3.9 forward voltage work when you only have a 12 V (14.4 V) supply? The total for 4 leds adds up to 15.6 volts. I don't doubt they light up as you have demonstrated, but why/how? I understand very little about electronics (perhaps only enough to get me into trouble) and can use the help in understanding. I want to use leds in my wingtips also.  Thanks! Cliff
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This has been questioned before - and rightly so. I'm not sure what to say except that it works and it really works well. The LEDs are current driven vs voltage driven - that might have something to do with it.
Maybe one of our EE's on the boards can answer this.
__________________
Cheers,
Pete
Amateur Plane - RV-9A N789PH - 2350+ Hrs
Amateur Radio - KD0CVN
Doggies Delivered - 25+
St. Paul, MN
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12-21-2008, 09:55 PM
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Join Date: Nov 2005
Posts: 1,256
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What are you using for your power supply?
__________________
Steve "Flying Scotsman"
Santa Clarita, CA
PP-ASEL, ASES, Instrument Airplane
RV-7A N660WS flying!
#8,000
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12-21-2008, 10:07 PM
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Join Date: Jan 2005
Location: MN
Posts: 2,269
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Ship's Power
Hi Steve,
The circuit above is hooked directly to ship's power (14.4V) with a switch. The resistor acts as a crude current limiter. It is cheap, simple, passive, and it works (at the expense of effciency). The PWM power supplies are more effcient, but until recently, they had some issues with RF noise and are more expensive.
Not sure if that answered your question - let me know if I missed.
__________________
Cheers,
Pete
Amateur Plane - RV-9A N789PH - 2350+ Hrs
Amateur Radio - KD0CVN
Doggies Delivered - 25+
St. Paul, MN
Last edited by petehowell : 12-21-2008 at 10:07 PM.
Reason: grammar
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01-03-2009, 06:08 PM
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Join Date: Jan 2005
Location: MN
Posts: 2,269
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More Pics
I've had a few requests for more pics, so here are some images Peter F captured today in his basement as we worked up what we are calling the Photon Bazooka(tm) for his -7.
This puppy will have two(waggable) 50 watt HID per tip and 4 Luxeon III stars for position. Several LED strobe candidates are currently being auditioned.
Here is the back of the LEDs with wiring
Peter metered on the LED die to keep the lights from blowing out the pic here. These are being driven at less than 200ma - 1/4 of full current. See the nice edge glow.....
Glamour pic of yours truly holding the power wires....hide this from your wives.  You get a sense of how obnoxiously bright these things are even running at a fraction of capacity.
Fun little project!
__________________
Cheers,
Pete
Amateur Plane - RV-9A N789PH - 2350+ Hrs
Amateur Radio - KD0CVN
Doggies Delivered - 25+
St. Paul, MN
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01-25-2009, 10:26 PM
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Join Date: Nov 2005
Posts: 1,256
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Hey, Pete...just ordered all the goodies to start making up these nav lights...yours looks like one of the best solutions I've seen, so we're gonna give it a whirl. One question...probably a dumb one...did you stand the plexi off from the fiberglas, and if so, how far/what'd you use? Or was it a function of the landing light fixture?
__________________
Steve "Flying Scotsman"
Santa Clarita, CA
PP-ASEL, ASES, Instrument Airplane
RV-7A N660WS flying!
#8,000
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01-25-2009, 11:00 PM
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Join Date: Jan 2005
Location: MN
Posts: 2,269
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Giddy Up!
Hi Steve,
The aluminium backing plate rides on the fiberglass and the plexi rides on little spacers and the luxeon stars. The holes in the plexi locate the stars on the aluminium backing plate.
Post some pics when you are done!
__________________
Cheers,
Pete
Amateur Plane - RV-9A N789PH - 2350+ Hrs
Amateur Radio - KD0CVN
Doggies Delivered - 25+
St. Paul, MN
Last edited by petehowell : 01-26-2009 at 05:34 AM.
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01-26-2009, 12:48 AM
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Join Date: Nov 2005
Posts: 1,256
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Quote:
Originally Posted by petehowell
Hi Steve,
The aluminium backing plate rides on the plexi and the plexi rides on little spacer and the luxeon stars. The holes in the plexi locate the stars on the aluminium backing plate.
Post some pics when you are done!
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I think I understand...did you mean the aluminum plate rides on the *fiberglass*, and then the plexi rides on the aluminum w/ spacers and the luxeons between them?
Seems straightforward...will post some pics when I get it done (which might be quite a while...the Luxeon site says there's several weeks backorder on one or the other of the colors of stars  ).
__________________
Steve "Flying Scotsman"
Santa Clarita, CA
PP-ASEL, ASES, Instrument Airplane
RV-7A N660WS flying!
#8,000
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01-26-2009, 05:35 AM
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Join Date: Jan 2005
Location: MN
Posts: 2,269
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Sorry
Steve - yes, that is exactly what I meant - I corrected the post above.
__________________
Cheers,
Pete
Amateur Plane - RV-9A N789PH - 2350+ Hrs
Amateur Radio - KD0CVN
Doggies Delivered - 25+
St. Paul, MN
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01-28-2009, 10:10 PM
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Join Date: Nov 2005
Posts: 1,256
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With regards to strobes...Aveo has the nice tail position/strobe LED light, that looks good. But for wingtip strobes, I'm just wondering...has anybody tried using an automotive solution? Just for example, what about something like this:
http://www.hyper-lights.com/product_...roducts_id=462
I don't know what the specs are for strobe lights per the FARs, but it seems to me there should be some solutions extant in the emergency vehicle supplier realm that would work for us...
__________________
Steve "Flying Scotsman"
Santa Clarita, CA
PP-ASEL, ASES, Instrument Airplane
RV-7A N660WS flying!
#8,000
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01-29-2009, 04:31 AM
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Join Date: Jun 2006
Location: Delaware, OH (KDLZ)
Posts: 4,196
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Quote:
Originally Posted by Flying Scotsman
With regards to strobes...Aveo has the nice tail position/strobe LED light, that looks good. But for wingtip strobes, I'm just wondering...has anybody tried using an automotive solution? Just for example, what about something like this:
http://www.hyper-lights.com/product_...roducts_id=462
I don't know what the specs are for strobe lights per the FARs, but it seems to me there should be some solutions extant in the emergency vehicle supplier realm that would work for us...
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This is the Nova product being resold. These are very noisy from a RF perspective. CreativAir attempted to sell them, but just took them off the market.
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