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Topic ClosedHK White Backlight current draw

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Gemini View Drop Down
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USERID: 198844
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Joined: 22/Mar/2009
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Direct Link To This Post Topic: HK White Backlight current draw
    Posted: 23/Jan/2012 at 12:52pm
HK White Backlight current draw vs. voltage applied 5-13V
The backlight has 2 leds wired in series.
TX battery voltage/current draw.
5V = 5Ma
6V =7Ma
7V = 9Ma
7.4V = 9.8Ma
8V = 11Ma
9V = 13Ma
9.6V = 14.25Ma
10V = 15Ma
11V = 17Ma
12V = 19Ma
12.6V = 20Ma
13v = 21Ma
Brightness of the backlight does depend on TX battery voltage used. The brightness at 7.4V was more like the stock EL on the SP board. At 9.6V to 12.6V the brightness was much brighter. !2 volts was a little brighter than 9.6-10V but the current went up to 20Ma. I use a LiFe 9.6 volt HK battery so I’m going to use 14.25Ma as my final current constant .My metering of course may have some difference in accuracy but should be close enough for most. 
For those using a 2 cell 7.4 type battery setup you may want to lower the 470 ohm resistor to allow the current to be 14Ma as the brightness increase is noticeable.
Hope this helps settle the current draw questions we all had.
If you install this BL note that w circuit board wiring error exists that stop the Trainer out/Simulator  PPM signal from working. It requires a circuit trace to be cut and a jumper to be added.  
http://www.rcgroups.com/forums/showpost.php?p=19770815&postcount=12455
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