rlborger(at)mac.com
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 Posted: Sun Dec 29, 2013 12:23 pm Post subject: More on the use of LED strings |
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Friends,
In my last posting on this subject I described hooking up a 5 meter string of LEDs to a small variable power supply and showing the results. To me it was quite encouraging and I elected to proceed.
There was some question as to using that power supply in an aircraft as it was a VPW (Variable Pulse Width) unit. These VPW units are notorious for introducing considerable electronic noise into aircraft electrical system. Another variable power supply had to be located.
Eric Jones, proprietor of Perihelion Design, advertised his Extraordinarily General Purpose Adjustable Voltage Regulator, hereafter referred to as the EGPAVR, as a low noise variable power supply for both incandescent and LED lamps. Here is his documentation for the unit:
I ordered a unit which arrived in very short time and connected it up to my power supply and the LED string.
Here is a picture of the EGPAVR connected to the power supply and the LED string with the power out to the string coming from the variable output (yellow lead) of the EGPAVR:
Here is a picture of the EGPAVR connected to the power supply and the LED string with the power out to the string coming from the constant output (green lead) of the EGPAVR:
It all seem to work quite well for my application. I plan to use a short section of the LED string to back-light my fuel sight gage. Power for this LED string will come from the variable output. The remainder of the LED string will be used to illuminate the tunnel area of the Europa and thereby serve as an interior work light. Power for this string will come from the constant output of the EGPAVR. I’ll have to add an inline switch from the constant output to the work LED string. This is so that the interior work light doesn’t come on every time the sight gage is illuminated, it can be turned on only when needed.
Now, if only it will warm up enough for me to get back to work in the hanger. It has been quite cold here in N.TX. I’ve tried a couple of the warmer days to work but still froze. And there’s no way that epoxy will set up in this weather. So I work at home in the shop on other projects.
Next posting on this subject will happen when I have had time & temperature to install the LED strings and EGPAVR in the aircraft.
Blue skies & tailwinds,
Bob Borger
Europa XS Tri, Rotax 914, Airmaster C/S Prop (50 hrs).
Little Toot Sport Biplane, Lycoming Thunderbolt AEIO-320 EXP
3705 Lynchburg Dr.
Corinth, TX 76208-5331
Cel: 817-992-1117
rlborger(at)mac.com
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