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Is there a way to power a blue and white LED for the Muta nd Lock signals?
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headrott  
#1 Posted : Sunday, March 13, 2011 1:27:48 PM(UTC)
headrott

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Location: Salem, Oregon
Hi,

I would like to use a white LED for the Mute signal and a blue LED for the Lock signal. These typically require 3.7 to 4.0 Volts to light up. Is there a way to get enough voltage to power these LED's? I can get a red and a green to light up but not the white and blue. Thanks for your help.

Greg
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Russ White  
#2 Posted : Sunday, March 13, 2011 1:48:05 PM(UTC)
Russ White

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You could use an NPN bipolar transistor and VD.

470R - 1K (depending on LED) to VD (which should be ~5.5V) -> LED -> Collector
Mute(or lock) in series with say 2K-10K to base.
Emitter to GND.

Edited by user Sunday, March 13, 2011 2:27:09 PM(UTC)  | Reason: Not specified
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headrott  
#3 Posted : Monday, March 14, 2011 7:09:22 AM(UTC)
headrott

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Thanks Russ. Can you recommend an NPN bipolar transistor and VD for this application? I will be using these LED's here:

http://www.mouser.com/Search/ProductDetail.aspx?R=Q8R1CXXB12Evirtualkey64200000virtualkey642-Q8R1CXXB12E

Thanks again Russ.
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Russ White  
#4 Posted : Monday, March 14, 2011 9:25:56 AM(UTC)
Russ White

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Just about any will work here. BC546 is what I would use because I have a whole pile of them. :) For VD, use the VD coming into the DAC.

Edited by user Monday, March 14, 2011 9:26:44 AM(UTC)  | Reason: Not specified
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