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Jordo  
#1 Posted : Thursday, February 16, 2012 1:58:17 AM(UTC)
Jordo

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The 4:1 Selector Knob is standard delivered with green LED's.
I want to use Blue LED's and ordered ones with the following specifications:

7,5mA
5V

Can I just replace them for the Green ones or do I have to adjust a resistor (or order complete other LED's)?

Thx in advance,

Jordo
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Russ White  
#2 Posted : Thursday, February 16, 2012 12:49:36 PM(UTC)
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forward voltage for most blue LEDs is going to be too high to be practical. You can try reducing the resistor by half - but it still may not work well. You may need to experiment a bit.
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Jordo  
#3 Posted : Thursday, February 16, 2012 2:05:02 PM(UTC)
Jordo

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Ok, what effect will it heave if the forward voltage seems to be too high? Is it about the brightness or will I encounter other problems?
There is only one resistor on the bord, is that the one for the LED's?

Thx,

Jordo
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Russ White  
#4 Posted : Thursday, February 16, 2012 10:52:38 PM(UTC)
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The only thing that may happen is they won't light up. :)

Yes That resistor is for the LEDs.
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Jordo  
#5 Posted : Wednesday, March 28, 2012 1:27:39 PM(UTC)
Jordo

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I have replaced the resistor with a 220 Ohm LED.
I must say that they illuminate dimmed now.
I might install a smaller resistor there.

Any suggestions for the next step? Will 100 Ohm be a too great step you think?
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