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  #11  
Old 12-21-2008, 02:40 PM
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petehowell petehowell is offline
 
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Default Hey Cliff!

Quote:
Originally Posted by striplic View Post
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
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.
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Amateur Plane - RV-9A N789PH - 2350+ Hrs
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  #12  
Old 12-21-2008, 09:55 PM
Flying Scotsman Flying Scotsman is offline
 
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Default

What are you using for your power supply?
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  #13  
Old 12-21-2008, 10:07 PM
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petehowell petehowell is offline
 
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Default 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.
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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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  #14  
Old 01-03-2009, 06:08 PM
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petehowell petehowell is offline
 
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Default 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!
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Amateur Plane - RV-9A N789PH - 2350+ Hrs
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  #15  
Old 01-25-2009, 10:26 PM
Flying Scotsman Flying Scotsman is offline
 
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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?
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  #16  
Old 01-25-2009, 11:00 PM
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petehowell petehowell is offline
 
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Default 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!
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Amateur Plane - RV-9A N789PH - 2350+ Hrs
Amateur Radio - KD0CVN
Doggies Delivered - 25+
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Last edited by petehowell : 01-26-2009 at 05:34 AM.
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  #17  
Old 01-26-2009, 12:48 AM
Flying Scotsman Flying Scotsman is offline
 
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Default

Quote:
Originally Posted by petehowell View Post
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!
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 ).
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  #18  
Old 01-26-2009, 05:35 AM
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petehowell petehowell is offline
 
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Default Sorry

Steve - yes, that is exactly what I meant - I corrected the post above.
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Amateur Plane - RV-9A N789PH - 2350+ Hrs
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  #19  
Old 01-28-2009, 10:10 PM
Flying Scotsman Flying Scotsman is offline
 
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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...
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RV-7A N660WS flying!
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  #20  
Old 01-29-2009, 04:31 AM
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rleffler rleffler is offline
 
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Default

Quote:
Originally Posted by Flying Scotsman View Post
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...

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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